diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 29089891..81003a02 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -36,7 +36,7 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GH_TOKEN }}
       - name: coveralls
-        uses: coverallsapp/github-action@v2
+        uses: coverallsapp/github-action@v2.3.8
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           flag-name: run-${{ matrix.test_number }}