diff --git a/crates/uv-requirements/src/source_tree.rs b/crates/uv-requirements/src/source_tree.rs
index a7a99c5a2..043ee51cb 100644
--- a/crates/uv-requirements/src/source_tree.rs
+++ b/crates/uv-requirements/src/source_tree.rs
@@ -1,5 +1,5 @@
 use std::borrow::Cow;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use std::sync::Arc;
 
 use anyhow::{Context, Result};
@@ -26,6 +26,8 @@ pub struct SourceTreeResolution {
     pub requirements: Box<[Requirement]>,
     /// The names of the projects that were resolved.
     pub project: PackageName,
+    /// The directory containing the package, usable as requirement source.
+    pub directory: Box<Path>,
     /// The extras used when resolving the requirements.
     pub extras: Box<[ExtraName]>,
 }
@@ -85,7 +87,7 @@ impl<'a, Context: BuildContext> SourceTreeResolver<'a, Context> {
 
     /// Infer the dependencies for a directory dependency.
     async fn resolve_source_tree(&self, path: &Path) -> Result<SourceTreeResolution> {
-        let metadata = self.resolve_requires_dist(path).await?;
+        let (directory, metadata) = self.resolve_requires_dist(path).await?;
         let origin = RequirementOrigin::Project(path.to_path_buf(), metadata.name.clone());
 
         // Determine the extras to include when resolving the requirements.
@@ -115,6 +117,7 @@ impl<'a, Context: BuildContext> SourceTreeResolver<'a, Context> {
 
         Ok(SourceTreeResolution {
             requirements,
+            directory: directory.into_boxed_path(),
             project,
             extras,
         })
@@ -124,7 +127,7 @@ impl<'a, Context: BuildContext> SourceTreeResolver<'a, Context> {
     /// requirements without building the distribution, even if the project contains (e.g.) a
     /// dynamic version since, critically, we don't need to install the package itself; only its
     /// dependencies.
-    async fn resolve_requires_dist(&self, path: &Path) -> Result<RequiresDist> {
+    async fn resolve_requires_dist(&self, path: &Path) -> Result<(PathBuf, RequiresDist)> {
         // Convert to a buildable source.
         let source_tree = fs_err::canonicalize(path).with_context(|| {
             format!(
@@ -144,8 +147,8 @@ impl<'a, Context: BuildContext> SourceTreeResolver<'a, Context> {
         // _only_ need the requirements. So, for example, even if the version is dynamic, we can
         // still extract the requirements without performing a build, unlike in the database where
         // we typically construct a "complete" metadata object.
-        if let Some(metadata) = self.database.requires_dist(source_tree).await? {
-            return Ok(metadata);
+        if let Some(metadata) = self.database.requires_dist(&source_tree).await? {
+            return Ok((source_tree.to_path_buf(), metadata));
         }
 
         let Ok(url) = Url::from_directory_path(source_tree).map(DisplaySafeUrl::from) else {
@@ -201,6 +204,6 @@ impl<'a, Context: BuildContext> SourceTreeResolver<'a, Context> {
             }
         };
 
-        Ok(RequiresDist::from(metadata))
+        Ok((source_tree.to_path_buf(), RequiresDist::from(metadata)))
     }
 }
diff --git a/crates/uv/src/commands/pip/operations.rs b/crates/uv/src/commands/pip/operations.rs
index de079d1ae..ab97a8289 100644
--- a/crates/uv/src/commands/pip/operations.rs
+++ b/crates/uv/src/commands/pip/operations.rs
@@ -20,14 +20,15 @@ use uv_dispatch::BuildDispatch;
 use uv_distribution::{DistributionDatabase, SourcedDependencyGroups};
 use uv_distribution_types::{
     CachedDist, Diagnostic, InstalledDist, LocalDist, NameRequirementSpecification, Requirement,
-    ResolutionDiagnostic, UnresolvedRequirement, UnresolvedRequirementSpecification,
+    RequirementSource, ResolutionDiagnostic, UnresolvedRequirement,
+    UnresolvedRequirementSpecification,
 };
 use uv_distribution_types::{DistributionMetadata, InstalledMetadata, Name, Resolution};
 use uv_fs::Simplified;
 use uv_install_wheel::LinkMode;
 use uv_installer::{Plan, Planner, Preparer, SitePackages};
 use uv_normalize::PackageName;
-use uv_pep508::{MarkerEnvironment, RequirementOrigin};
+use uv_pep508::{MarkerEnvironment, MarkerTree, RequirementOrigin, VerbatimUrl};
 use uv_platform_tags::Tags;
 use uv_preview::Preview;
 use uv_pypi_types::{Conflicts, ResolverMarkerEnvironment};
@@ -130,6 +131,7 @@ pub(crate) async fn resolve<InstalledPackages: InstalledPackagesProvider>(
     let start = std::time::Instant::now();
 
     // Resolve the requirements from the provided sources.
+    let mut source_tree_requirements = Vec::new();
     let requirements = {
         // Partition the requirements into named and unnamed requirements.
         let (mut requirements, unnamed): (Vec<_>, Vec<_>) =
@@ -170,6 +172,8 @@ pub(crate) async fn resolve<InstalledPackages: InstalledPackagesProvider>(
             .resolve(source_trees.iter().map(PathBuf::as_path))
             .await?;
 
+            source_tree_requirements.clone_from(&resolutions);
+
             // If we resolved a single project, use it for the project name.
             project = project.or_else(|| {
                 if let [resolution] = &resolutions[..] {
@@ -287,7 +291,24 @@ pub(crate) async fn resolve<InstalledPackages: InstalledPackagesProvider>(
         constraints
             .into_iter()
             .map(|constraint| constraint.requirement)
-            .chain(upgrade.constraints().cloned()),
+            .chain(upgrade.constraints().cloned())
+            .chain(source_tree_requirements.into_iter().map(|source_tree| {
+                let url = VerbatimUrl::from_normalized_path(&source_tree.directory)
+                    .expect("Invalid source tree resolution");
+                Requirement {
+                    name: source_tree.project,
+                    extras: Box::new([]),
+                    groups: Box::new([]),
+                    marker: MarkerTree::default(),
+                    source: RequirementSource::Directory {
+                        install_path: source_tree.directory,
+                        editable: None,
+                        r#virtual: None,
+                        url,
+                    },
+                    origin: None,
+                }
+            })),
     );
     let overrides = Overrides::from_requirements(overrides);
     let preferences = Preferences::from_iter(preferences, &resolver_env);