diff --git a/.github/workflows/docs-publish.yml b/.github/workflows/docs-publish.yml
index 768e31442..92900e259 100644
--- a/.github/workflows/docs-publish.yml
+++ b/.github/workflows/docs-publish.yml
@@ -70,7 +70,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: 3.x
-      - run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV
+      - run: echo "cache_id=${{github.sha}}" >> $GITHUB_ENV
       - uses: actions/cache@v3
         with:
           key: mkdocs-material-${{ env.cache_id }}