diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4b46ede..ab16728 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -3,6 +3,9 @@ name: Test
 on:
   - push
 
+env:
+  UV_LOCKED: 1  # Ensure lockfile is up to date at test time
+
 jobs:
   test:
     runs-on: ubuntu-latest