diff --git a/Cargo.lock b/Cargo.lock
index 61791812a6..2453977a0a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2072,10 +2072,6 @@ dependencies = [
 [[package]]
 name = "ruff_python_stdlib"
 version = "0.0.0"
-dependencies = [
- "once_cell",
- "rustc-hash",
-]
 
 [[package]]
 name = "ruff_python_whitespace"
diff --git a/crates/ruff/src/rules/isort/categorize.rs b/crates/ruff/src/rules/isort/categorize.rs
index ac6348476d..c9ec34447a 100644
--- a/crates/ruff/src/rules/isort/categorize.rs
+++ b/crates/ruff/src/rules/isort/categorize.rs
@@ -8,7 +8,7 @@ use serde::{Deserialize, Serialize};
 use strum_macros::EnumIter;
 
 use ruff_macros::CacheKey;
-use ruff_python_stdlib::sys::KNOWN_STANDARD_LIBRARY;
+use ruff_python_stdlib::sys::is_known_standard_library;
 
 use crate::settings::types::PythonVersion;
 use crate::warn_user_once;
@@ -82,11 +82,7 @@ pub(crate) fn categorize<'a>(
             (&ImportSection::Known(ImportType::Future), Reason::Future)
         } else if let Some((import_type, reason)) = known_modules.categorize(module_name) {
             (import_type, reason)
-        } else if KNOWN_STANDARD_LIBRARY
-            .get(&target_version.as_tuple())
-            .unwrap()
-            .contains(module_base)
-        {
+        } else if is_known_standard_library(target_version.minor(), module_base) {
             (
                 &ImportSection::Known(ImportType::StandardLibrary),
                 Reason::KnownStandardLibrary,
diff --git a/crates/ruff/src/settings/types.rs b/crates/ruff/src/settings/types.rs
index ca813bcb0a..5395ce9ec5 100644
--- a/crates/ruff/src/settings/types.rs
+++ b/crates/ruff/src/settings/types.rs
@@ -52,6 +52,14 @@ impl PythonVersion {
         }
     }
 
+    pub const fn major(&self) -> u32 {
+        self.as_tuple().0
+    }
+
+    pub const fn minor(&self) -> u32 {
+        self.as_tuple().1
+    }
+
     pub fn get_minimum_supported_version(requires_version: &VersionSpecifiers) -> Option<Self> {
         let mut minimum_version = None;
         for python_version in PythonVersion::iter() {
diff --git a/crates/ruff_python_stdlib/Cargo.toml b/crates/ruff_python_stdlib/Cargo.toml
index 91e43d5377..167b9fad04 100644
--- a/crates/ruff_python_stdlib/Cargo.toml
+++ b/crates/ruff_python_stdlib/Cargo.toml
@@ -13,5 +13,3 @@ license = { workspace = true }
 [lib]
 
 [dependencies]
-once_cell = { workspace = true }
-rustc-hash = { workspace = true }
diff --git a/crates/ruff_python_stdlib/src/sys.rs b/crates/ruff_python_stdlib/src/sys.rs
index 791b7db2d9..c6d28db289 100644
--- a/crates/ruff_python_stdlib/src/sys.rs
+++ b/crates/ruff_python_stdlib/src/sys.rs
@@ -1,1107 +1,276 @@
 //! This file is generated by `scripts/generate_known_standard_library.py`
-use once_cell::sync::Lazy;
-use rustc_hash::{FxHashMap, FxHashSet};
 
-// See: https://pycqa.github.io/isort/docs/configuration/options.html#known-standard-library
-pub static KNOWN_STANDARD_LIBRARY: Lazy<FxHashMap<(u32, u32), FxHashSet<&'static str>>> =
-    Lazy::new(|| {
-        FxHashMap::from_iter([
-            (
-                (3, 7),
-                FxHashSet::from_iter([
-                    "_ast",
-                    "_dummy_thread",
-                    "_thread",
-                    "abc",
-                    "aifc",
-                    "argparse",
-                    "array",
-                    "ast",
-                    "asynchat",
-                    "asyncio",
-                    "asyncore",
-                    "atexit",
-                    "audioop",
-                    "base64",
-                    "bdb",
-                    "binascii",
-                    "binhex",
-                    "bisect",
-                    "builtins",
-                    "bz2",
-                    "cProfile",
-                    "calendar",
-                    "cgi",
-                    "cgitb",
-                    "chunk",
-                    "cmath",
-                    "cmd",
-                    "code",
-                    "codecs",
-                    "codeop",
-                    "collections",
-                    "colorsys",
-                    "compileall",
-                    "concurrent",
-                    "configparser",
-                    "contextlib",
-                    "contextvars",
-                    "copy",
-                    "copyreg",
-                    "crypt",
-                    "csv",
-                    "ctypes",
-                    "curses",
-                    "dataclasses",
-                    "datetime",
-                    "dbm",
-                    "decimal",
-                    "difflib",
-                    "dis",
-                    "distutils",
-                    "doctest",
-                    "dummy_threading",
-                    "email",
-                    "encodings",
-                    "ensurepip",
-                    "enum",
-                    "errno",
-                    "faulthandler",
-                    "fcntl",
-                    "filecmp",
-                    "fileinput",
-                    "fnmatch",
-                    "formatter",
-                    "fractions",
-                    "ftplib",
-                    "functools",
-                    "gc",
-                    "getopt",
-                    "getpass",
-                    "gettext",
-                    "glob",
-                    "grp",
-                    "gzip",
-                    "hashlib",
-                    "heapq",
-                    "hmac",
-                    "html",
-                    "http",
-                    "imaplib",
-                    "imghdr",
-                    "imp",
-                    "importlib",
-                    "inspect",
-                    "io",
-                    "ipaddress",
-                    "itertools",
-                    "json",
-                    "keyword",
-                    "lib2to3",
-                    "linecache",
-                    "locale",
-                    "logging",
-                    "lzma",
-                    "macpath",
-                    "mailbox",
-                    "mailcap",
-                    "marshal",
-                    "math",
-                    "mimetypes",
-                    "mmap",
-                    "modulefinder",
-                    "msilib",
-                    "msvcrt",
-                    "multiprocessing",
-                    "netrc",
-                    "nis",
-                    "nntplib",
-                    "ntpath",
-                    "numbers",
-                    "operator",
-                    "optparse",
-                    "os",
-                    "ossaudiodev",
-                    "parser",
-                    "pathlib",
-                    "pdb",
-                    "pickle",
-                    "pickletools",
-                    "pipes",
-                    "pkgutil",
-                    "platform",
-                    "plistlib",
-                    "poplib",
-                    "posix",
-                    "posixpath",
-                    "pprint",
-                    "profile",
-                    "pstats",
-                    "pty",
-                    "pwd",
-                    "py_compile",
-                    "pyclbr",
-                    "pydoc",
-                    "queue",
-                    "quopri",
-                    "random",
-                    "re",
-                    "readline",
-                    "reprlib",
-                    "resource",
-                    "rlcompleter",
-                    "runpy",
-                    "sched",
-                    "secrets",
-                    "select",
-                    "selectors",
-                    "shelve",
-                    "shlex",
-                    "shutil",
-                    "signal",
-                    "site",
-                    "smtpd",
-                    "smtplib",
-                    "sndhdr",
-                    "socket",
-                    "socketserver",
-                    "spwd",
-                    "sqlite3",
-                    "sre",
-                    "sre_compile",
-                    "sre_constants",
-                    "sre_parse",
-                    "ssl",
-                    "stat",
-                    "statistics",
-                    "string",
-                    "stringprep",
-                    "struct",
-                    "subprocess",
-                    "sunau",
-                    "symbol",
-                    "symtable",
-                    "sys",
-                    "sysconfig",
-                    "syslog",
-                    "tabnanny",
-                    "tarfile",
-                    "telnetlib",
-                    "tempfile",
-                    "termios",
-                    "test",
-                    "textwrap",
-                    "threading",
-                    "time",
-                    "timeit",
-                    "tkinter",
-                    "token",
-                    "tokenize",
-                    "trace",
-                    "traceback",
-                    "tracemalloc",
-                    "tty",
-                    "turtle",
-                    "turtledemo",
-                    "types",
-                    "typing",
-                    "unicodedata",
-                    "unittest",
-                    "urllib",
-                    "uu",
-                    "uuid",
-                    "venv",
-                    "warnings",
-                    "wave",
-                    "weakref",
-                    "webbrowser",
-                    "winreg",
-                    "winsound",
-                    "wsgiref",
-                    "xdrlib",
-                    "xml",
-                    "xmlrpc",
-                    "zipapp",
-                    "zipfile",
-                    "zipimport",
-                    "zlib",
-                ]),
-            ),
-            (
-                (3, 8),
-                FxHashSet::from_iter([
-                    "_ast",
-                    "_dummy_thread",
-                    "_thread",
-                    "abc",
-                    "aifc",
-                    "argparse",
-                    "array",
-                    "ast",
-                    "asynchat",
-                    "asyncio",
-                    "asyncore",
-                    "atexit",
-                    "audioop",
-                    "base64",
-                    "bdb",
-                    "binascii",
-                    "binhex",
-                    "bisect",
-                    "builtins",
-                    "bz2",
-                    "cProfile",
-                    "calendar",
-                    "cgi",
-                    "cgitb",
-                    "chunk",
-                    "cmath",
-                    "cmd",
-                    "code",
-                    "codecs",
-                    "codeop",
-                    "collections",
-                    "colorsys",
-                    "compileall",
-                    "concurrent",
-                    "configparser",
-                    "contextlib",
-                    "contextvars",
-                    "copy",
-                    "copyreg",
-                    "crypt",
-                    "csv",
-                    "ctypes",
-                    "curses",
-                    "dataclasses",
-                    "datetime",
-                    "dbm",
-                    "decimal",
-                    "difflib",
-                    "dis",
-                    "distutils",
-                    "doctest",
-                    "dummy_threading",
-                    "email",
-                    "encodings",
-                    "ensurepip",
-                    "enum",
-                    "errno",
-                    "faulthandler",
-                    "fcntl",
-                    "filecmp",
-                    "fileinput",
-                    "fnmatch",
-                    "formatter",
-                    "fractions",
-                    "ftplib",
-                    "functools",
-                    "gc",
-                    "getopt",
-                    "getpass",
-                    "gettext",
-                    "glob",
-                    "grp",
-                    "gzip",
-                    "hashlib",
-                    "heapq",
-                    "hmac",
-                    "html",
-                    "http",
-                    "imaplib",
-                    "imghdr",
-                    "imp",
-                    "importlib",
-                    "inspect",
-                    "io",
-                    "ipaddress",
-                    "itertools",
-                    "json",
-                    "keyword",
-                    "lib2to3",
-                    "linecache",
-                    "locale",
-                    "logging",
-                    "lzma",
-                    "mailbox",
-                    "mailcap",
-                    "marshal",
-                    "math",
-                    "mimetypes",
-                    "mmap",
-                    "modulefinder",
-                    "msilib",
-                    "msvcrt",
-                    "multiprocessing",
-                    "netrc",
-                    "nis",
-                    "nntplib",
-                    "ntpath",
-                    "numbers",
-                    "operator",
-                    "optparse",
-                    "os",
-                    "ossaudiodev",
-                    "parser",
-                    "pathlib",
-                    "pdb",
-                    "pickle",
-                    "pickletools",
-                    "pipes",
-                    "pkgutil",
-                    "platform",
-                    "plistlib",
-                    "poplib",
-                    "posix",
-                    "posixpath",
-                    "pprint",
-                    "profile",
-                    "pstats",
-                    "pty",
-                    "pwd",
-                    "py_compile",
-                    "pyclbr",
-                    "pydoc",
-                    "queue",
-                    "quopri",
-                    "random",
-                    "re",
-                    "readline",
-                    "reprlib",
-                    "resource",
-                    "rlcompleter",
-                    "runpy",
-                    "sched",
-                    "secrets",
-                    "select",
-                    "selectors",
-                    "shelve",
-                    "shlex",
-                    "shutil",
-                    "signal",
-                    "site",
-                    "smtpd",
-                    "smtplib",
-                    "sndhdr",
-                    "socket",
-                    "socketserver",
-                    "spwd",
-                    "sqlite3",
-                    "sre",
-                    "sre_compile",
-                    "sre_constants",
-                    "sre_parse",
-                    "ssl",
-                    "stat",
-                    "statistics",
-                    "string",
-                    "stringprep",
-                    "struct",
-                    "subprocess",
-                    "sunau",
-                    "symbol",
-                    "symtable",
-                    "sys",
-                    "sysconfig",
-                    "syslog",
-                    "tabnanny",
-                    "tarfile",
-                    "telnetlib",
-                    "tempfile",
-                    "termios",
-                    "test",
-                    "textwrap",
-                    "threading",
-                    "time",
-                    "timeit",
-                    "tkinter",
-                    "token",
-                    "tokenize",
-                    "trace",
-                    "traceback",
-                    "tracemalloc",
-                    "tty",
-                    "turtle",
-                    "turtledemo",
-                    "types",
-                    "typing",
-                    "unicodedata",
-                    "unittest",
-                    "urllib",
-                    "uu",
-                    "uuid",
-                    "venv",
-                    "warnings",
-                    "wave",
-                    "weakref",
-                    "webbrowser",
-                    "winreg",
-                    "winsound",
-                    "wsgiref",
-                    "xdrlib",
-                    "xml",
-                    "xmlrpc",
-                    "zipapp",
-                    "zipfile",
-                    "zipimport",
-                    "zlib",
-                ]),
-            ),
-            (
-                (3, 9),
-                FxHashSet::from_iter([
-                    "_ast",
-                    "_thread",
-                    "abc",
-                    "aifc",
-                    "argparse",
-                    "array",
-                    "ast",
-                    "asynchat",
-                    "asyncio",
-                    "asyncore",
-                    "atexit",
-                    "audioop",
-                    "base64",
-                    "bdb",
-                    "binascii",
-                    "binhex",
-                    "bisect",
-                    "builtins",
-                    "bz2",
-                    "cProfile",
-                    "calendar",
-                    "cgi",
-                    "cgitb",
-                    "chunk",
-                    "cmath",
-                    "cmd",
-                    "code",
-                    "codecs",
-                    "codeop",
-                    "collections",
-                    "colorsys",
-                    "compileall",
-                    "concurrent",
-                    "configparser",
-                    "contextlib",
-                    "contextvars",
-                    "copy",
-                    "copyreg",
-                    "crypt",
-                    "csv",
-                    "ctypes",
-                    "curses",
-                    "dataclasses",
-                    "datetime",
-                    "dbm",
-                    "decimal",
-                    "difflib",
-                    "dis",
-                    "distutils",
-                    "doctest",
-                    "email",
-                    "encodings",
-                    "ensurepip",
-                    "enum",
-                    "errno",
-                    "faulthandler",
-                    "fcntl",
-                    "filecmp",
-                    "fileinput",
-                    "fnmatch",
-                    "formatter",
-                    "fractions",
-                    "ftplib",
-                    "functools",
-                    "gc",
-                    "getopt",
-                    "getpass",
-                    "gettext",
-                    "glob",
-                    "graphlib",
-                    "grp",
-                    "gzip",
-                    "hashlib",
-                    "heapq",
-                    "hmac",
-                    "html",
-                    "http",
-                    "imaplib",
-                    "imghdr",
-                    "imp",
-                    "importlib",
-                    "inspect",
-                    "io",
-                    "ipaddress",
-                    "itertools",
-                    "json",
-                    "keyword",
-                    "lib2to3",
-                    "linecache",
-                    "locale",
-                    "logging",
-                    "lzma",
-                    "mailbox",
-                    "mailcap",
-                    "marshal",
-                    "math",
-                    "mimetypes",
-                    "mmap",
-                    "modulefinder",
-                    "msilib",
-                    "msvcrt",
-                    "multiprocessing",
-                    "netrc",
-                    "nis",
-                    "nntplib",
-                    "ntpath",
-                    "numbers",
-                    "operator",
-                    "optparse",
-                    "os",
-                    "ossaudiodev",
-                    "parser",
-                    "pathlib",
-                    "pdb",
-                    "pickle",
-                    "pickletools",
-                    "pipes",
-                    "pkgutil",
-                    "platform",
-                    "plistlib",
-                    "poplib",
-                    "posix",
-                    "posixpath",
-                    "pprint",
-                    "profile",
-                    "pstats",
-                    "pty",
-                    "pwd",
-                    "py_compile",
-                    "pyclbr",
-                    "pydoc",
-                    "queue",
-                    "quopri",
-                    "random",
-                    "re",
-                    "readline",
-                    "reprlib",
-                    "resource",
-                    "rlcompleter",
-                    "runpy",
-                    "sched",
-                    "secrets",
-                    "select",
-                    "selectors",
-                    "shelve",
-                    "shlex",
-                    "shutil",
-                    "signal",
-                    "site",
-                    "smtpd",
-                    "smtplib",
-                    "sndhdr",
-                    "socket",
-                    "socketserver",
-                    "spwd",
-                    "sqlite3",
-                    "sre",
-                    "sre_compile",
-                    "sre_constants",
-                    "sre_parse",
-                    "ssl",
-                    "stat",
-                    "statistics",
-                    "string",
-                    "stringprep",
-                    "struct",
-                    "subprocess",
-                    "sunau",
-                    "symbol",
-                    "symtable",
-                    "sys",
-                    "sysconfig",
-                    "syslog",
-                    "tabnanny",
-                    "tarfile",
-                    "telnetlib",
-                    "tempfile",
-                    "termios",
-                    "test",
-                    "textwrap",
-                    "threading",
-                    "time",
-                    "timeit",
-                    "tkinter",
-                    "token",
-                    "tokenize",
-                    "trace",
-                    "traceback",
-                    "tracemalloc",
-                    "tty",
-                    "turtle",
-                    "turtledemo",
-                    "types",
-                    "typing",
-                    "unicodedata",
-                    "unittest",
-                    "urllib",
-                    "uu",
-                    "uuid",
-                    "venv",
-                    "warnings",
-                    "wave",
-                    "weakref",
-                    "webbrowser",
-                    "winreg",
-                    "winsound",
-                    "wsgiref",
-                    "xdrlib",
-                    "xml",
-                    "xmlrpc",
-                    "zipapp",
-                    "zipfile",
-                    "zipimport",
-                    "zlib",
-                    "zoneinfo",
-                ]),
-            ),
-            (
-                (3, 10),
-                FxHashSet::from_iter([
-                    "_ast",
-                    "_thread",
-                    "abc",
-                    "aifc",
-                    "argparse",
-                    "array",
-                    "ast",
-                    "asynchat",
-                    "asyncio",
-                    "asyncore",
-                    "atexit",
-                    "audioop",
-                    "base64",
-                    "bdb",
-                    "binascii",
-                    "binhex",
-                    "bisect",
-                    "builtins",
-                    "bz2",
-                    "cProfile",
-                    "calendar",
-                    "cgi",
-                    "cgitb",
-                    "chunk",
-                    "cmath",
-                    "cmd",
-                    "code",
-                    "codecs",
-                    "codeop",
-                    "collections",
-                    "colorsys",
-                    "compileall",
-                    "concurrent",
-                    "configparser",
-                    "contextlib",
-                    "contextvars",
-                    "copy",
-                    "copyreg",
-                    "crypt",
-                    "csv",
-                    "ctypes",
-                    "curses",
-                    "dataclasses",
-                    "datetime",
-                    "dbm",
-                    "decimal",
-                    "difflib",
-                    "dis",
-                    "distutils",
-                    "doctest",
-                    "email",
-                    "encodings",
-                    "ensurepip",
-                    "enum",
-                    "errno",
-                    "faulthandler",
-                    "fcntl",
-                    "filecmp",
-                    "fileinput",
-                    "fnmatch",
-                    "fractions",
-                    "ftplib",
-                    "functools",
-                    "gc",
-                    "getopt",
-                    "getpass",
-                    "gettext",
-                    "glob",
-                    "graphlib",
-                    "grp",
-                    "gzip",
-                    "hashlib",
-                    "heapq",
-                    "hmac",
-                    "html",
-                    "http",
-                    "idlelib",
-                    "imaplib",
-                    "imghdr",
-                    "imp",
-                    "importlib",
-                    "inspect",
-                    "io",
-                    "ipaddress",
-                    "itertools",
-                    "json",
-                    "keyword",
-                    "lib2to3",
-                    "linecache",
-                    "locale",
-                    "logging",
-                    "lzma",
-                    "mailbox",
-                    "mailcap",
-                    "marshal",
-                    "math",
-                    "mimetypes",
-                    "mmap",
-                    "modulefinder",
-                    "msilib",
-                    "msvcrt",
-                    "multiprocessing",
-                    "netrc",
-                    "nis",
-                    "nntplib",
-                    "ntpath",
-                    "numbers",
-                    "operator",
-                    "optparse",
-                    "os",
-                    "ossaudiodev",
-                    "pathlib",
-                    "pdb",
-                    "pickle",
-                    "pickletools",
-                    "pipes",
-                    "pkgutil",
-                    "platform",
-                    "plistlib",
-                    "poplib",
-                    "posix",
-                    "posixpath",
-                    "pprint",
-                    "profile",
-                    "pstats",
-                    "pty",
-                    "pwd",
-                    "py_compile",
-                    "pyclbr",
-                    "pydoc",
-                    "queue",
-                    "quopri",
-                    "random",
-                    "re",
-                    "readline",
-                    "reprlib",
-                    "resource",
-                    "rlcompleter",
-                    "runpy",
-                    "sched",
-                    "secrets",
-                    "select",
-                    "selectors",
-                    "shelve",
-                    "shlex",
-                    "shutil",
-                    "signal",
-                    "site",
-                    "smtpd",
-                    "smtplib",
-                    "sndhdr",
-                    "socket",
-                    "socketserver",
-                    "spwd",
-                    "sqlite3",
-                    "sre",
-                    "sre_compile",
-                    "sre_constants",
-                    "sre_parse",
-                    "ssl",
-                    "stat",
-                    "statistics",
-                    "string",
-                    "stringprep",
-                    "struct",
-                    "subprocess",
-                    "sunau",
-                    "symtable",
-                    "sys",
-                    "sysconfig",
-                    "syslog",
-                    "tabnanny",
-                    "tarfile",
-                    "telnetlib",
-                    "tempfile",
-                    "termios",
-                    "test",
-                    "textwrap",
-                    "threading",
-                    "time",
-                    "timeit",
-                    "tkinter",
-                    "token",
-                    "tokenize",
-                    "trace",
-                    "traceback",
-                    "tracemalloc",
-                    "tty",
-                    "turtle",
-                    "turtledemo",
-                    "types",
-                    "typing",
-                    "unicodedata",
-                    "unittest",
-                    "urllib",
-                    "uu",
-                    "uuid",
-                    "venv",
-                    "warnings",
-                    "wave",
-                    "weakref",
-                    "webbrowser",
-                    "winreg",
-                    "winsound",
-                    "wsgiref",
-                    "xdrlib",
-                    "xml",
-                    "xmlrpc",
-                    "zipapp",
-                    "zipfile",
-                    "zipimport",
-                    "zlib",
-                    "zoneinfo",
-                ]),
-            ),
-            (
-                (3, 11),
-                FxHashSet::from_iter([
-                    "_ast",
-                    "_thread",
-                    "abc",
-                    "aifc",
-                    "argparse",
-                    "array",
-                    "ast",
-                    "asynchat",
-                    "asyncio",
-                    "asyncore",
-                    "atexit",
-                    "audioop",
-                    "base64",
-                    "bdb",
-                    "binascii",
-                    "bisect",
-                    "builtins",
-                    "bz2",
-                    "cProfile",
-                    "calendar",
-                    "cgi",
-                    "cgitb",
-                    "chunk",
-                    "cmath",
-                    "cmd",
-                    "code",
-                    "codecs",
-                    "codeop",
-                    "collections",
-                    "colorsys",
-                    "compileall",
-                    "concurrent",
-                    "configparser",
-                    "contextlib",
-                    "contextvars",
-                    "copy",
-                    "copyreg",
-                    "crypt",
-                    "csv",
-                    "ctypes",
-                    "curses",
-                    "dataclasses",
-                    "datetime",
-                    "dbm",
-                    "decimal",
-                    "difflib",
-                    "dis",
-                    "distutils",
-                    "doctest",
-                    "email",
-                    "encodings",
-                    "ensurepip",
-                    "enum",
-                    "errno",
-                    "faulthandler",
-                    "fcntl",
-                    "filecmp",
-                    "fileinput",
-                    "fnmatch",
-                    "fractions",
-                    "ftplib",
-                    "functools",
-                    "gc",
-                    "getopt",
-                    "getpass",
-                    "gettext",
-                    "glob",
-                    "graphlib",
-                    "grp",
-                    "gzip",
-                    "hashlib",
-                    "heapq",
-                    "hmac",
-                    "html",
-                    "http",
-                    "idlelib",
-                    "imaplib",
-                    "imghdr",
-                    "imp",
-                    "importlib",
-                    "inspect",
-                    "io",
-                    "ipaddress",
-                    "itertools",
-                    "json",
-                    "keyword",
-                    "lib2to3",
-                    "linecache",
-                    "locale",
-                    "logging",
-                    "lzma",
-                    "mailbox",
-                    "mailcap",
-                    "marshal",
-                    "math",
-                    "mimetypes",
-                    "mmap",
-                    "modulefinder",
-                    "msilib",
-                    "msvcrt",
-                    "multiprocessing",
-                    "netrc",
-                    "nis",
-                    "nntplib",
-                    "ntpath",
-                    "numbers",
-                    "operator",
-                    "optparse",
-                    "os",
-                    "ossaudiodev",
-                    "pathlib",
-                    "pdb",
-                    "pickle",
-                    "pickletools",
-                    "pipes",
-                    "pkgutil",
-                    "platform",
-                    "plistlib",
-                    "poplib",
-                    "posix",
-                    "posixpath",
-                    "pprint",
-                    "profile",
-                    "pstats",
-                    "pty",
-                    "pwd",
-                    "py_compile",
-                    "pyclbr",
-                    "pydoc",
-                    "queue",
-                    "quopri",
-                    "random",
-                    "re",
-                    "readline",
-                    "reprlib",
-                    "resource",
-                    "rlcompleter",
-                    "runpy",
-                    "sched",
-                    "secrets",
-                    "select",
-                    "selectors",
-                    "shelve",
-                    "shlex",
-                    "shutil",
-                    "signal",
-                    "site",
-                    "smtpd",
-                    "smtplib",
-                    "sndhdr",
-                    "socket",
-                    "socketserver",
-                    "spwd",
-                    "sqlite3",
-                    "sre",
-                    "sre_compile",
-                    "sre_constants",
-                    "sre_parse",
-                    "ssl",
-                    "stat",
-                    "statistics",
-                    "string",
-                    "stringprep",
-                    "struct",
-                    "subprocess",
-                    "sunau",
-                    "symtable",
-                    "sys",
-                    "sysconfig",
-                    "syslog",
-                    "tabnanny",
-                    "tarfile",
-                    "telnetlib",
-                    "tempfile",
-                    "termios",
-                    "test",
-                    "textwrap",
-                    "threading",
-                    "time",
-                    "timeit",
-                    "tkinter",
-                    "token",
-                    "tokenize",
-                    "tomllib",
-                    "trace",
-                    "traceback",
-                    "tracemalloc",
-                    "tty",
-                    "turtle",
-                    "turtledemo",
-                    "types",
-                    "typing",
-                    "unicodedata",
-                    "unittest",
-                    "urllib",
-                    "uu",
-                    "uuid",
-                    "venv",
-                    "warnings",
-                    "wave",
-                    "weakref",
-                    "webbrowser",
-                    "winreg",
-                    "winsound",
-                    "wsgiref",
-                    "xdrlib",
-                    "xml",
-                    "xmlrpc",
-                    "zipapp",
-                    "zipfile",
-                    "zipimport",
-                    "zlib",
-                    "zoneinfo",
-                ]),
-            ),
-        ])
-    });
+pub fn is_known_standard_library(minor_version: u32, module: &str) -> bool {
+    matches!(
+        (minor_version, module),
+        (
+            _,
+            "_ast"
+                | "_thread"
+                | "abc"
+                | "aifc"
+                | "argparse"
+                | "array"
+                | "ast"
+                | "asyncio"
+                | "atexit"
+                | "audioop"
+                | "base64"
+                | "bdb"
+                | "binascii"
+                | "bisect"
+                | "builtins"
+                | "bz2"
+                | "cProfile"
+                | "calendar"
+                | "cgi"
+                | "cgitb"
+                | "chunk"
+                | "cmath"
+                | "cmd"
+                | "code"
+                | "codecs"
+                | "codeop"
+                | "collections"
+                | "colorsys"
+                | "compileall"
+                | "concurrent"
+                | "configparser"
+                | "contextlib"
+                | "contextvars"
+                | "copy"
+                | "copyreg"
+                | "crypt"
+                | "csv"
+                | "ctypes"
+                | "curses"
+                | "dataclasses"
+                | "datetime"
+                | "dbm"
+                | "decimal"
+                | "difflib"
+                | "dis"
+                | "doctest"
+                | "email"
+                | "encodings"
+                | "ensurepip"
+                | "enum"
+                | "errno"
+                | "faulthandler"
+                | "fcntl"
+                | "filecmp"
+                | "fileinput"
+                | "fnmatch"
+                | "fractions"
+                | "ftplib"
+                | "functools"
+                | "gc"
+                | "getopt"
+                | "getpass"
+                | "gettext"
+                | "glob"
+                | "grp"
+                | "gzip"
+                | "hashlib"
+                | "heapq"
+                | "hmac"
+                | "html"
+                | "http"
+                | "imaplib"
+                | "imghdr"
+                | "importlib"
+                | "inspect"
+                | "io"
+                | "ipaddress"
+                | "itertools"
+                | "json"
+                | "keyword"
+                | "lib2to3"
+                | "linecache"
+                | "locale"
+                | "logging"
+                | "lzma"
+                | "mailbox"
+                | "mailcap"
+                | "marshal"
+                | "math"
+                | "mimetypes"
+                | "mmap"
+                | "modulefinder"
+                | "msilib"
+                | "msvcrt"
+                | "multiprocessing"
+                | "netrc"
+                | "nis"
+                | "nntplib"
+                | "ntpath"
+                | "numbers"
+                | "operator"
+                | "optparse"
+                | "os"
+                | "ossaudiodev"
+                | "pathlib"
+                | "pdb"
+                | "pickle"
+                | "pickletools"
+                | "pipes"
+                | "pkgutil"
+                | "platform"
+                | "plistlib"
+                | "poplib"
+                | "posix"
+                | "posixpath"
+                | "pprint"
+                | "profile"
+                | "pstats"
+                | "pty"
+                | "pwd"
+                | "py_compile"
+                | "pyclbr"
+                | "pydoc"
+                | "queue"
+                | "quopri"
+                | "random"
+                | "re"
+                | "readline"
+                | "reprlib"
+                | "resource"
+                | "rlcompleter"
+                | "runpy"
+                | "sched"
+                | "secrets"
+                | "select"
+                | "selectors"
+                | "shelve"
+                | "shlex"
+                | "shutil"
+                | "signal"
+                | "site"
+                | "smtplib"
+                | "sndhdr"
+                | "socket"
+                | "socketserver"
+                | "spwd"
+                | "sqlite3"
+                | "sre"
+                | "sre_compile"
+                | "sre_constants"
+                | "sre_parse"
+                | "ssl"
+                | "stat"
+                | "statistics"
+                | "string"
+                | "stringprep"
+                | "struct"
+                | "subprocess"
+                | "sunau"
+                | "symtable"
+                | "sys"
+                | "sysconfig"
+                | "syslog"
+                | "tabnanny"
+                | "tarfile"
+                | "telnetlib"
+                | "tempfile"
+                | "termios"
+                | "test"
+                | "textwrap"
+                | "threading"
+                | "time"
+                | "timeit"
+                | "tkinter"
+                | "token"
+                | "tokenize"
+                | "trace"
+                | "traceback"
+                | "tracemalloc"
+                | "tty"
+                | "turtle"
+                | "turtledemo"
+                | "types"
+                | "typing"
+                | "unicodedata"
+                | "unittest"
+                | "urllib"
+                | "uu"
+                | "uuid"
+                | "venv"
+                | "warnings"
+                | "wave"
+                | "weakref"
+                | "webbrowser"
+                | "winreg"
+                | "winsound"
+                | "wsgiref"
+                | "xdrlib"
+                | "xml"
+                | "xmlrpc"
+                | "zipapp"
+                | "zipfile"
+                | "zipimport"
+                | "zlib"
+        ) | (
+            7,
+            "_dummy_thread"
+                | "asynchat"
+                | "asyncore"
+                | "binhex"
+                | "distutils"
+                | "dummy_threading"
+                | "formatter"
+                | "imp"
+                | "macpath"
+                | "parser"
+                | "smtpd"
+                | "symbol"
+        ) | (
+            8,
+            "_dummy_thread"
+                | "asynchat"
+                | "asyncore"
+                | "binhex"
+                | "distutils"
+                | "dummy_threading"
+                | "formatter"
+                | "imp"
+                | "parser"
+                | "smtpd"
+                | "symbol"
+        ) | (
+            9,
+            "asynchat"
+                | "asyncore"
+                | "binhex"
+                | "distutils"
+                | "formatter"
+                | "graphlib"
+                | "imp"
+                | "parser"
+                | "smtpd"
+                | "symbol"
+                | "zoneinfo"
+        ) | (
+            10,
+            "asynchat"
+                | "asyncore"
+                | "binhex"
+                | "distutils"
+                | "graphlib"
+                | "idlelib"
+                | "imp"
+                | "smtpd"
+                | "zoneinfo"
+        ) | (
+            11,
+            "asynchat"
+                | "asyncore"
+                | "distutils"
+                | "graphlib"
+                | "idlelib"
+                | "imp"
+                | "smtpd"
+                | "tomllib"
+                | "zoneinfo"
+        ) | (12, "graphlib" | "idlelib" | "tomllib" | "zoneinfo")
+    )
+}
diff --git a/scripts/generate_known_standard_library.py b/scripts/generate_known_standard_library.py
index 5d9c66c58b..f35a714d0e 100644
--- a/scripts/generate_known_standard_library.py
+++ b/scripts/generate_known_standard_library.py
@@ -12,13 +12,14 @@ from pathlib import Path
 from sphinx.ext.intersphinx import fetch_inventory
 
 URL = "https://docs.python.org/{}/objects.inv"
-PATH = Path("crates") / "ruff_python" / "src" / "sys.rs"
+PATH = Path("crates") / "ruff_python_stdlib" / "src" / "sys.rs"
 VERSIONS: list[tuple[int, int]] = [
     (3, 7),
     (3, 8),
     (3, 9),
     (3, 10),
     (3, 11),
+    (3, 12),
 ]
 
 
@@ -37,18 +38,16 @@ with PATH.open("w") as f:
     f.write(
         """\
 //! This file is generated by `scripts/generate_known_standard_library.py`
-use once_cell::sync::Lazy;
-use rustc_hash::{FxHashMap, FxHashSet};
 
-// See: https://pycqa.github.io/isort/docs/configuration/options.html#known-standard-library
-pub static KNOWN_STANDARD_LIBRARY: Lazy<FxHashMap<(u32, u32), FxHashSet<&'static str>>> =
-    Lazy::new(|| {
-        FxHashMap::from_iter([
-""",  # noqa: E501
+pub fn is_known_standard_library(minor_version: u32, module: &str) -> bool {
+    matches!((minor_version, module),
+""",
     )
-    for major, minor in VERSIONS:
-        version = f"{major}.{minor}"
-        url = URL.format(version)
+
+    modules_by_version = {}
+
+    for major_version, minor_version in VERSIONS:
+        url = URL.format(f"{major_version}.{minor_version}")
         invdata = fetch_inventory(FakeApp(), "", url)
 
         modules = {
@@ -60,33 +59,44 @@ pub static KNOWN_STANDARD_LIBRARY: Lazy<FxHashMap<(u32, u32), FxHashSet<&'static
             "sre_compile",
             "sre",
         }
+
         for module in invdata["py:module"]:
             root, *_ = module.split(".")
             if root not in ["__future__", "__main__"]:
                 modules.add(root)
 
-        f.write(
-            f"""\
-            (
-                ({major}, {minor}),
-                FxHashSet::from_iter([
-""",
-        )
-        for module in sorted(modules):
-            f.write(
-                f"""\
-                    "{module}",
-""",
-            )
-        f.write(
-            """\
-                ]),
-            ),
-""",
+        modules_by_version[minor_version] = modules
+
+    # First, add a case for the modules that are in all versions.
+    ubiquitous_modules = set.intersection(*modules_by_version.values())
+
+    f.write("(_, ")
+    for i, module in enumerate(sorted(ubiquitous_modules)):
+        if i > 0:
+            f.write(" | ")
+        f.write(f'"{module}"')
+    f.write(")")
+    f.write("\n")
+
+    # Next, add any version-specific modules.
+    for _major_version, minor_version in VERSIONS:
+        version_modules = set.difference(
+            modules_by_version[minor_version],
+            ubiquitous_modules,
         )
+
+        f.write(" | ")
+        f.write(f"({minor_version}, ")
+        for i, module in enumerate(sorted(version_modules)):
+            if i > 0:
+                f.write(" | ")
+            f.write(f'"{module}"')
+        f.write(")")
+        f.write("\n")
+
     f.write(
         """\
-        ])
-    });
-""",
+        )
+}
+    """,
     )