diff --git a/crates/puffin-resolver/src/pubgrub/dependencies.rs b/crates/puffin-resolver/src/pubgrub/dependencies.rs
index f59247384..25b2e7f32 100644
--- a/crates/puffin-resolver/src/pubgrub/dependencies.rs
+++ b/crates/puffin-resolver/src/pubgrub/dependencies.rs
@@ -1,6 +1,6 @@
+use fxhash::FxHashMap;
 use itertools::Itertools;
 use pubgrub::range::Range;
-use pubgrub::type_aliases::DependencyConstraints;
 use tracing::warn;
 
 use pep508_rs::{MarkerEnvironment, Requirement, VersionOrUrl};
@@ -12,7 +12,7 @@ use crate::pubgrub::{PubGrubPackage, PubGrubVersion};
 use crate::ResolveError;
 
 #[derive(Debug)]
-pub struct PubGrubDependencies(DependencyConstraints<PubGrubPackage, Range<PubGrubVersion>>);
+pub struct PubGrubDependencies(FxHashMap<PubGrubPackage, Range<PubGrubVersion>>);
 
 impl PubGrubDependencies {
     /// Generate a set of `PubGrub` dependencies from a set of requirements.
@@ -23,8 +23,7 @@ impl PubGrubDependencies {
         source: Option<&'a PackageName>,
         env: &'a MarkerEnvironment,
     ) -> Result<Self, ResolveError> {
-        let mut dependencies =
-            DependencyConstraints::<PubGrubPackage, Range<PubGrubVersion>>::default();
+        let mut dependencies = FxHashMap::<PubGrubPackage, Range<PubGrubVersion>>::default();
 
         // Iterate over all declared requirements.
         for requirement in requirements {
@@ -138,7 +137,7 @@ impl PubGrubDependencies {
 }
 
 /// Convert a [`PubGrubDependencies`] to a [`DependencyConstraints`].
-impl From<PubGrubDependencies> for DependencyConstraints<PubGrubPackage, Range<PubGrubVersion>> {
+impl From<PubGrubDependencies> for FxHashMap<PubGrubPackage, Range<PubGrubVersion>> {
     fn from(dependencies: PubGrubDependencies) -> Self {
         dependencies.0
     }
diff --git a/crates/puffin-resolver/src/resolver.rs b/crates/puffin-resolver/src/resolver.rs
index d1af6e55a..89fbb6026 100644
--- a/crates/puffin-resolver/src/resolver.rs
+++ b/crates/puffin-resolver/src/resolver.rs
@@ -11,7 +11,6 @@ use fxhash::{FxHashMap, FxHashSet};
 use pubgrub::error::PubGrubError;
 use pubgrub::range::Range;
 use pubgrub::solver::{Incompatibility, State};
-use pubgrub::type_aliases::DependencyConstraints;
 use tokio::select;
 use tokio::sync::Mutex;
 use tracing::{debug, error, trace};
@@ -236,7 +235,12 @@ impl<'a, Context: BuildContext + Sync> Resolver<'a, Context> {
                         ));
                         continue;
                     }
-                    Dependencies::Known(constraints) if constraints.contains_key(package) => {
+                    Dependencies::Known(constraints)
+                        if constraints
+                            .clone()
+                            .into_iter()
+                            .any(|(dependency, _)| &dependency == package) =>
+                    {
                         return Err(PubGrubError::SelfDependency {
                             package: package.clone(),
                             version: version.clone(),
@@ -250,7 +254,7 @@ impl<'a, Context: BuildContext + Sync> Resolver<'a, Context> {
                 let dep_incompats = state.add_incompatibility_from_dependencies(
                     package.clone(),
                     version.clone(),
-                    &dependencies,
+                    dependencies,
                 );
 
                 state.partial_solution.add_version(
@@ -977,5 +981,5 @@ enum Dependencies {
     /// Package dependencies are unavailable.
     Unknown,
     /// Container for all available package versions.
-    Known(DependencyConstraints<PubGrubPackage, Range<PubGrubVersion>>),
+    Known(FxHashMap<PubGrubPackage, Range<PubGrubVersion>>),
 }
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 50fa4928b..5d56faf9a 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.73"
+channel = "nightly"
diff --git a/vendor/pubgrub/src/internal/core.rs b/vendor/pubgrub/src/internal/core.rs
index ca1dec1c3..d768482b6 100644
--- a/vendor/pubgrub/src/internal/core.rs
+++ b/vendor/pubgrub/src/internal/core.rs
@@ -24,7 +24,7 @@ pub struct State<P: Package, VS: VersionSet, Priority: Ord + Clone> {
     root_package: P,
     root_version: VS::V,
 
-    incompatibilities: Map<P, Vec<IncompId<P, VS>>>,
+    pub incompatibilities: Map<P, Vec<IncompId<P, VS>>>,
 
     /// Store the ids of incompatibilities that are already contradicted
     /// and will stay that way until the next conflict and backtrack is operated.
diff --git a/vendor/pubgrub/src/internal/incompatibility.rs b/vendor/pubgrub/src/internal/incompatibility.rs
index fd33d6af0..03a4cf3ba 100644
--- a/vendor/pubgrub/src/internal/incompatibility.rs
+++ b/vendor/pubgrub/src/internal/incompatibility.rs
@@ -31,14 +31,14 @@ use crate::version_set::VersionSet;
 #[derive(Debug, Clone)]
 pub struct Incompatibility<P: Package, VS: VersionSet> {
     package_terms: SmallMap<P, Term<VS>>,
-    kind: Kind<P, VS>,
+    pub kind: Kind<P, VS>,
 }
 
 /// Type alias of unique identifiers for incompatibilities.
 pub type IncompId<P, VS> = Id<Incompatibility<P, VS>>;
 
 #[derive(Debug, Clone)]
-enum Kind<P: Package, VS: VersionSet> {
+pub enum Kind<P: Package, VS: VersionSet> {
     /// Initial incompatibility aiming at picking the root package for the first decision.
     NotRoot(P, VS::V),
     /// There are no versions in the given range for this package.
diff --git a/vendor/pubgrub/src/internal/partial_solution.rs b/vendor/pubgrub/src/internal/partial_solution.rs
index 057dea134..6a8a2bff5 100644
--- a/vendor/pubgrub/src/internal/partial_solution.rs
+++ b/vendor/pubgrub/src/internal/partial_solution.rs
@@ -252,6 +252,24 @@ impl<P: Package, VS: VersionSet, Priority: Ord + Clone> PartialSolution<P, VS, P
         }
     }
 
+    pub fn prioritized_packages(&self) -> impl Iterator<Item = (&P, &VS)> {
+        let check_all = self.changed_this_decision_level
+            == self.current_decision_level.0.saturating_sub(1) as usize;
+        let current_decision_level = self.current_decision_level;
+        self.package_assignments
+            .get_range(self.changed_this_decision_level..)
+            .unwrap()
+            .iter()
+            .filter(move |(_, pa)| {
+                // We only actually need to update the package if its Been changed
+                // since the last time we called prioritize.
+                // Which means it's highest decision level is the current decision level,
+                // or if we backtracked in the mean time.
+                check_all || pa.highest_decision_level == current_decision_level
+            })
+            .filter_map(|(p, pa)| pa.assignments_intersection.potential_package_filter(p))
+    }
+
     pub fn pick_highest_priority_pkg(
         &mut self,
         prioritizer: impl Fn(&P, &VS) -> Priority,
diff --git a/vendor/pubgrub/src/lib.rs b/vendor/pubgrub/src/lib.rs
index f41058bd7..0a6c3369a 100644
--- a/vendor/pubgrub/src/lib.rs
+++ b/vendor/pubgrub/src/lib.rs
@@ -219,8 +219,7 @@
 //! with a cache, you may want to know that some versions
 //! do not exist in your cache.
 
-#![allow(clippy::rc_buffer)]
-#![warn(missing_docs)]
+#![allow(clippy::all, unreachable_pub)]
 
 pub mod error;
 pub mod package;
diff --git a/vendor/pubgrub/src/range.rs b/vendor/pubgrub/src/range.rs
index be7ff250f..a62413244 100644
--- a/vendor/pubgrub/src/range.rs
+++ b/vendor/pubgrub/src/range.rs
@@ -373,7 +373,7 @@ impl<V: Display + Eq> Display for Range<V> {
                     (Included(v), Unbounded) => write!(f, ">={v}")?,
                     (Included(v), Included(b)) => {
                         if v == b {
-                            write!(f, "{v}")?
+                            write!(f, "=={v}")?
                         } else {
                             write!(f, ">={v}, <={b}")?
                         }
diff --git a/vendor/pubgrub/src/solver.rs b/vendor/pubgrub/src/solver.rs
index 956e46be7..a908b4a52 100644
--- a/vendor/pubgrub/src/solver.rs
+++ b/vendor/pubgrub/src/solver.rs
@@ -73,8 +73,8 @@ use std::collections::{BTreeMap, BTreeSet as Set};
 use std::error::Error;
 
 use crate::error::PubGrubError;
-use crate::internal::core::State;
-use crate::internal::incompatibility::Incompatibility;
+pub use crate::internal::core::State;
+pub use crate::internal::incompatibility::{Incompatibility, Kind};
 use crate::package::Package;
 use crate::type_aliases::{Map, SelectedDependencies};
 use crate::version_set::VersionSet;
diff --git a/vendor/pubgrub/src/term.rs b/vendor/pubgrub/src/term.rs
index cf7aa6f7b..895afdfe0 100644
--- a/vendor/pubgrub/src/term.rs
+++ b/vendor/pubgrub/src/term.rs
@@ -64,7 +64,7 @@ impl<VS: VersionSet> Term<VS> {
 
     /// Unwrap the set contained in a positive term.
     /// Will panic if used on a negative set.
-    pub(crate) fn unwrap_positive(&self) -> &VS {
+    pub fn unwrap_positive(&self) -> &VS {
         match self {
             Self::Positive(set) => set,
             _ => panic!("Negative term cannot unwrap positive set"),