diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f59e494..98f4b37 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -72,6 +72,10 @@ jobs:
         uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: "3.13"
+      - name: Set up uv
+        uses: astral-sh/setup-uv@bec219d24cd3e171d82865faccec33120bb574f4 # v10.1.0
+        with:
+          version: "0.12.8"
       - name: Install quality dependencies
         run: python -m pip install ".[dev,typer,quality]"
       - name: Validate repository baseline
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9bb80c4..c3716ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,10 @@ and versions are tracked in the repo-root `VERSION` file.
 
 - Continue compatibility hardening and adoption work for the next release.
 
+### Changed
+
+- Include `uv.lock` freshness in the authoritative local validation aggregate (#424).
+
 ## [0.5.0] - 2026-10-03
 
 ### Added
diff --git a/tests/full_validate.sh b/tests/full_validate.sh
index 6138c9f..9dec3d8 100755
--- a/tests/full_validate.sh
+++ b/tests/full_validate.sh
@@ -25,7 +25,9 @@ require_commands() {
 }
 
 run_baseline() {
+  require_commands uv
   bash ./tests/validate.sh
+  uv lock --check
 }
 
 run_runtime() {