diff --git a/crates/uv-resolver/src/lock/mod.rs b/crates/uv-resolver/src/lock/mod.rs
index ae8aeb63b3e3..3951bbd85995 100644
--- a/crates/uv-resolver/src/lock/mod.rs
+++ b/crates/uv-resolver/src/lock/mod.rs
@@ -2751,17 +2751,6 @@ impl PackageIdForDependency {
         unambiguous_package_ids: &FxHashMap<PackageName, PackageId>,
     ) -> Result<PackageId, LockError> {
         let unambiguous_package_id = unambiguous_package_ids.get(&self.name);
-        let version = if let Some(version) = self.version {
-            Some(version)
-        } else {
-            let Some(dist_id) = unambiguous_package_id else {
-                return Err(LockErrorKind::MissingDependencyVersion {
-                    name: self.name.clone(),
-                }
-                .into());
-            };
-            dist_id.version.clone()
-        };
         let source = self.source.map(Ok::<_, LockError>).unwrap_or_else(|| {
             let Some(package_id) = unambiguous_package_id else {
                 return Err(LockErrorKind::MissingDependencySource {
@@ -2771,6 +2760,24 @@ impl PackageIdForDependency {
             };
             Ok(package_id.source.clone())
         })?;
+        let version = if let Some(version) = self.version {
+            Some(version)
+        } else {
+            if let Some(package_id) = unambiguous_package_id {
+                package_id.version.clone()
+            } else {
+                // If the package is a source tree, assume that the missing `self.version` field is
+                // indicative of a dynamic version.
+                if source.is_source_tree() {
+                    None
+                } else {
+                    return Err(LockErrorKind::MissingDependencyVersion {
+                        name: self.name.clone(),
+                    }
+                    .into());
+                }
+            }
+        };
         Ok(PackageId {
             name: self.name,
             version,
@@ -5040,13 +5047,13 @@ requires-python = ">=3.12"
 [[package]]
 name = "a"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package]]
 name = "b"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package.dependencies]]
@@ -5066,18 +5073,18 @@ requires-python = ">=3.12"
 [[package]]
 name = "a"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package]]
 name = "b"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package.dependencies]]
 name = "a"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 "#;
         let result: Result<Lock, _> = toml::from_str(data);
         insta::assert_debug_snapshot!(result);
@@ -5092,13 +5099,13 @@ requires-python = ">=3.12"
 [[package]]
 name = "a"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package]]
 name = "b"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package.dependencies]]
@@ -5117,19 +5124,19 @@ requires-python = ">=3.12"
 [[package]]
 name = "a"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package]]
 name = "a"
 version = "0.1.1"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package]]
 name = "b"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package.dependencies]]
@@ -5149,24 +5156,24 @@ requires-python = ">=3.12"
 [[package]]
 name = "a"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package]]
 name = "a"
 version = "0.1.1"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package]]
 name = "b"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package.dependencies]]
 name = "a"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 "#;
         let result = toml::from_str::<Lock>(data).unwrap_err();
         assert_stripped_snapshot!(result, @"Dependency `a` has missing `version` field but has more than one matching package");
@@ -5181,7 +5188,7 @@ requires-python = ">=3.12"
 [[package]]
 name = "a"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package]]
@@ -5193,14 +5200,44 @@ sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d
 [[package]]
 name = "b"
 version = "0.1.0"
-source =  { registry = "https://pypi.org/simple" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
 
 [[package.dependencies]]
 name = "a"
 "#;
         let result = toml::from_str::<Lock>(data).unwrap_err();
-        assert_stripped_snapshot!(result, @"Dependency `a` has missing `version` field but has more than one matching package");
+        assert_stripped_snapshot!(result, @"Dependency `a` has missing `source` field but has more than one matching package");
+    }
+
+    #[test]
+    fn missing_dependency_version_dynamic() {
+        let data = r#"
+version = 1
+requires-python = ">=3.12"
+
+[[package]]
+name = "a"
+source = { editable = "path/to/a" }
+
+[[package]]
+name = "a"
+version = "0.1.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
+
+[[package]]
+name = "b"
+version = "0.1.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://example.com", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 0 }
+
+[[package.dependencies]]
+name = "a"
+source = { editable = "path/to/a" }
+"#;
+        let result = toml::from_str::<Lock>(data);
+        insta::assert_debug_snapshot!(result);
     }
 
     #[test]
diff --git a/crates/uv-resolver/src/lock/snapshots/uv_resolver__lock__tests__missing_dependency_version_dynamic.snap b/crates/uv-resolver/src/lock/snapshots/uv_resolver__lock__tests__missing_dependency_version_dynamic.snap
new file mode 100644
index 000000000000..8a0726607b62
--- /dev/null
+++ b/crates/uv-resolver/src/lock/snapshots/uv_resolver__lock__tests__missing_dependency_version_dynamic.snap
@@ -0,0 +1,221 @@
+---
+source: crates/uv-resolver/src/lock/mod.rs
+expression: result
+---
+Ok(
+    Lock {
+        version: 1,
+        fork_markers: [],
+        conflicts: Conflicts(
+            [],
+        ),
+        supported_environments: [],
+        requires_python: RequiresPython {
+            specifiers: VersionSpecifiers(
+                [
+                    VersionSpecifier {
+                        operator: GreaterThanEqual,
+                        version: "3.12",
+                    },
+                ],
+            ),
+            range: RequiresPythonRange(
+                LowerBound(
+                    Included(
+                        "3.12",
+                    ),
+                ),
+                UpperBound(
+                    Unbounded,
+                ),
+            ),
+        },
+        options: ResolverOptions {
+            resolution_mode: Highest,
+            prerelease_mode: IfNecessaryOrExplicit,
+            fork_strategy: RequiresPython,
+            exclude_newer: None,
+        },
+        packages: [
+            Package {
+                id: PackageId {
+                    name: PackageName(
+                        "a",
+                    ),
+                    version: None,
+                    source: Editable(
+                        "path/to/a",
+                    ),
+                },
+                sdist: None,
+                wheels: [],
+                fork_markers: [],
+                dependencies: [],
+                optional_dependencies: {},
+                dependency_groups: {},
+                metadata: PackageMetadata {
+                    requires_dist: {},
+                    dependency_groups: {},
+                },
+            },
+            Package {
+                id: PackageId {
+                    name: PackageName(
+                        "a",
+                    ),
+                    version: Some(
+                        "0.1.1",
+                    ),
+                    source: Registry(
+                        Url(
+                            UrlString(
+                                "https://pypi.org/simple",
+                            ),
+                        ),
+                    ),
+                },
+                sdist: Some(
+                    Url {
+                        url: UrlString(
+                            "https://example.com",
+                        ),
+                        metadata: SourceDistMetadata {
+                            hash: Some(
+                                Hash(
+                                    HashDigest {
+                                        algorithm: Sha256,
+                                        digest: "37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3",
+                                    },
+                                ),
+                            ),
+                            size: Some(
+                                0,
+                            ),
+                        },
+                    },
+                ),
+                wheels: [],
+                fork_markers: [],
+                dependencies: [],
+                optional_dependencies: {},
+                dependency_groups: {},
+                metadata: PackageMetadata {
+                    requires_dist: {},
+                    dependency_groups: {},
+                },
+            },
+            Package {
+                id: PackageId {
+                    name: PackageName(
+                        "b",
+                    ),
+                    version: Some(
+                        "0.1.0",
+                    ),
+                    source: Registry(
+                        Url(
+                            UrlString(
+                                "https://pypi.org/simple",
+                            ),
+                        ),
+                    ),
+                },
+                sdist: Some(
+                    Url {
+                        url: UrlString(
+                            "https://example.com",
+                        ),
+                        metadata: SourceDistMetadata {
+                            hash: Some(
+                                Hash(
+                                    HashDigest {
+                                        algorithm: Sha256,
+                                        digest: "37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3",
+                                    },
+                                ),
+                            ),
+                            size: Some(
+                                0,
+                            ),
+                        },
+                    },
+                ),
+                wheels: [],
+                fork_markers: [],
+                dependencies: [
+                    Dependency {
+                        package_id: PackageId {
+                            name: PackageName(
+                                "a",
+                            ),
+                            version: None,
+                            source: Editable(
+                                "path/to/a",
+                            ),
+                        },
+                        extra: {},
+                        simplified_marker: SimplifiedMarkerTree(
+                            true,
+                        ),
+                        complexified_marker: python_full_version >= '3.12',
+                    },
+                ],
+                optional_dependencies: {},
+                dependency_groups: {},
+                metadata: PackageMetadata {
+                    requires_dist: {},
+                    dependency_groups: {},
+                },
+            },
+        ],
+        by_id: {
+            PackageId {
+                name: PackageName(
+                    "a",
+                ),
+                version: None,
+                source: Editable(
+                    "path/to/a",
+                ),
+            }: 0,
+            PackageId {
+                name: PackageName(
+                    "a",
+                ),
+                version: Some(
+                    "0.1.1",
+                ),
+                source: Registry(
+                    Url(
+                        UrlString(
+                            "https://pypi.org/simple",
+                        ),
+                    ),
+                ),
+            }: 1,
+            PackageId {
+                name: PackageName(
+                    "b",
+                ),
+                version: Some(
+                    "0.1.0",
+                ),
+                source: Registry(
+                    Url(
+                        UrlString(
+                            "https://pypi.org/simple",
+                        ),
+                    ),
+                ),
+            }: 2,
+        },
+        manifest: ResolverManifest {
+            members: {},
+            requirements: {},
+            dependency_groups: {},
+            constraints: {},
+            overrides: {},
+            dependency_metadata: {},
+        },
+    },
+)
diff --git a/crates/uv/tests/it/lock.rs b/crates/uv/tests/it/lock.rs
index d7f940fd9b51..f8880d747493 100644
--- a/crates/uv/tests/it/lock.rs
+++ b/crates/uv/tests/it/lock.rs
@@ -17220,7 +17220,7 @@ fn lock_unsupported_version() -> Result<()> {
 
     ----- stderr -----
     error: Failed to parse `uv.lock`, which uses an unsupported schema version (v2, but only v1 is supported). Downgrade to a compatible uv version, or remove the `uv.lock` prior to running `uv lock` or `uv sync`.
-      Caused by: Dependency `iniconfig` has missing `version` field but has more than one matching package
+      Caused by: Dependency `iniconfig` has missing `source` field but has more than one matching package
     "###);
 
     Ok(())