diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 309231b30..2d95a9e2e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -128,7 +128,7 @@ jobs:
         working-directory: crates/uv-trampoline
         run: |
           rustup target add x86_64-pc-windows-msvc
-          rustup component add clippy rust-src --toolchain nightly-2024-01-23-x86_64-pc-windows-msvc
+          rustup component add clippy rust-src --toolchain nightly-2024-03-19-x86_64-pc-windows-msvc
       - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
         with:
diff --git a/crates/uv-trampoline/README.md b/crates/uv-trampoline/README.md
index 6163ff809..f26055554 100644
--- a/crates/uv-trampoline/README.md
+++ b/crates/uv-trampoline/README.md
@@ -104,8 +104,10 @@ might not realize that, and still emit references to the unwinding helper
 `__CxxFrameHandler3`. And then the linker blows up because that symbol doesn't
 exist.
 
-`cargo build --release --target x86_64-pc-windows-msvc`
-or `cargo build --release --target aarch64-pc-windows-msvc`
+```
+cargo build --release --target x86_64-pc-windows-msvc
+cargo build --release --target aarch64-pc-windows-msvc
+```
 
 Hopefully in the future as `#![no_std]` develops, this will get smoother.
 
@@ -123,6 +125,6 @@ rustup target add aarch64-pc-windows-msvc
 ```
 
 ```shell
-cargo +nightly xwin build --release --target x86_64-pc-windows-msvc
-cargo +nightly xwin build --release --target aarch64-pc-windows-msvc
+cargo +nightly-2024-03-19 xwin build --release --target x86_64-pc-windows-msvc
+cargo +nightly-2024-03-19 xwin build --release --target aarch64-pc-windows-msvc
 ```
diff --git a/crates/uv-trampoline/rust-toolchain.toml b/crates/uv-trampoline/rust-toolchain.toml
index d30faf8af..e51a32bf6 100644
--- a/crates/uv-trampoline/rust-toolchain.toml
+++ b/crates/uv-trampoline/rust-toolchain.toml
@@ -1,2 +1,2 @@
 [toolchain]
-channel = "nightly-2024-01-23"
+channel = "nightly-2024-03-19"
diff --git a/crates/uv-trampoline/src/bounce.rs b/crates/uv-trampoline/src/bounce.rs
index cfc87ec84..7dad39a59 100644
--- a/crates/uv-trampoline/src/bounce.rs
+++ b/crates/uv-trampoline/src/bounce.rs
@@ -24,7 +24,7 @@ use windows_sys::Win32::{
 };
 
 use crate::helpers::SizeOf;
-use crate::{c, eprintln, format};
+use crate::{eprintln, format};
 
 const MAGIC_NUMBER: [u8; 4] = [b'U', b'V', b'U', b'V'];
 const PATH_LEN_SIZE: usize = mem::size_of::<u32>();
@@ -438,8 +438,8 @@ fn clear_app_starting_state(child_handle: HANDLE) {
         WaitForInputIdle(child_handle, INFINITE);
         let hwnd = CreateWindowExA(
             0,
-            c!("STATIC").as_ptr() as *const _,
-            c!("uv Python Trampoline").as_ptr() as *const _,
+            c"STATIC".as_ptr() as *const _,
+            c"uv Python Trampoline".as_ptr() as *const _,
             0,
             0,
             0,
@@ -474,10 +474,10 @@ pub fn bounce(is_gui: bool) -> ! {
 
         // (best effort) Switch to some innocuous directory so we don't hold the original
         // cwd open.
-        if let Some(tmp) = getenv(c!("TEMP")) {
+        if let Some(tmp) = getenv(c"TEMP") {
             SetCurrentDirectoryA(tmp.as_ptr() as *const _);
         } else {
-            SetCurrentDirectoryA(c!("c:\\").as_ptr() as *const _);
+            SetCurrentDirectoryA(c"c:\\".as_ptr() as *const _);
         }
 
         // We want to ignore control-C/control-Break/logout/etc.; the same event will
diff --git a/crates/uv-trampoline/src/diagnostics.rs b/crates/uv-trampoline/src/diagnostics.rs
index f4774a918..7ca9a7943 100644
--- a/crates/uv-trampoline/src/diagnostics.rs
+++ b/crates/uv-trampoline/src/diagnostics.rs
@@ -60,7 +60,7 @@ pub(crate) fn write_diagnostic(message: &str) {
                 MessageBoxA(0, nul_terminated.as_ptr() as *const _, null(), 0);
                 return;
             }
-            remaining = &remaining.get_unchecked(written as usize..);
+            remaining = remaining.get_unchecked(written as usize..);
         }
     }
 }
diff --git a/crates/uv-trampoline/src/helpers.rs b/crates/uv-trampoline/src/helpers.rs
index 95f3831b8..7f88a01d5 100644
--- a/crates/uv-trampoline/src/helpers.rs
+++ b/crates/uv-trampoline/src/helpers.rs
@@ -9,11 +9,3 @@ impl<T: Sized> SizeOf for T {
         size_of::<T>() as u32
     }
 }
-
-// CStr literal: c!("...")
-#[macro_export]
-macro_rules! c {
-    ($s:literal) => {
-        core::ffi::CStr::from_bytes_with_nul_unchecked(concat!($s, "\0").as_bytes())
-    };
-}
diff --git a/crates/uv-trampoline/trampolines/uv-trampoline-aarch64-console.exe b/crates/uv-trampoline/trampolines/uv-trampoline-aarch64-console.exe
index cfbe31139..7a01a6cb5 100755
Binary files a/crates/uv-trampoline/trampolines/uv-trampoline-aarch64-console.exe and b/crates/uv-trampoline/trampolines/uv-trampoline-aarch64-console.exe differ
diff --git a/crates/uv-trampoline/trampolines/uv-trampoline-aarch64-gui.exe b/crates/uv-trampoline/trampolines/uv-trampoline-aarch64-gui.exe
index a406b687e..ed8bb9667 100755
Binary files a/crates/uv-trampoline/trampolines/uv-trampoline-aarch64-gui.exe and b/crates/uv-trampoline/trampolines/uv-trampoline-aarch64-gui.exe differ
diff --git a/crates/uv-trampoline/trampolines/uv-trampoline-x86_64-console.exe b/crates/uv-trampoline/trampolines/uv-trampoline-x86_64-console.exe
index a1e771a0e..740f31240 100644
Binary files a/crates/uv-trampoline/trampolines/uv-trampoline-x86_64-console.exe and b/crates/uv-trampoline/trampolines/uv-trampoline-x86_64-console.exe differ
diff --git a/crates/uv-trampoline/trampolines/uv-trampoline-x86_64-gui.exe b/crates/uv-trampoline/trampolines/uv-trampoline-x86_64-gui.exe
index 6a7515b60..fc845efca 100644
Binary files a/crates/uv-trampoline/trampolines/uv-trampoline-x86_64-gui.exe and b/crates/uv-trampoline/trampolines/uv-trampoline-x86_64-gui.exe differ