diff --git a/.github/workflows/phpunit-lang.yml b/.github/workflows/phpunit-lang.yml
index 6467e2946..ac3d5bb62 100644
--- a/.github/workflows/phpunit-lang.yml
+++ b/.github/workflows/phpunit-lang.yml
@@ -44,7 +44,7 @@ jobs:
         run: echo "COMPOSER_CACHE_FILES_DIR=$(composer config cache-files-dir)" >> $GITHUB_ENV
 
       - name: Cache composer dependencies
-        uses: actions/cache@v6
+        uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 #v6.0.0
         with:
           path: ${{ env.COMPOSER_CACHE_FILES_DIR }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}-${{ hashFiles('**/composer.lock') }}