diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 40ff25d..1613bbe 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -34,6 +34,7 @@ jobs:
         with:
           node-version: '20'
           cache: yarn
+      - run: yarn install --immutable
       - run: attw --pack .
   release:
     needs: