diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 503212f73..61ff66ea1 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -37,7 +37,7 @@ jobs:
           key: ${{ env.key }}
 
       - name: Cache extensions
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.5
         with:
           path: ${{ steps.cache-env.outputs.dir }}
           key: ${{ steps.cache-env.outputs.key }}
@@ -61,7 +61,7 @@ jobs:
         run: ECHO "COMPOSER_CACHE_DIR=~\AppData\Local\Composer" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
 
       - name: Cache dependencies installed with composer
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.5
         with:
           path: ${{ env.COMPOSER_CACHE_DIR }}
           key: php${{ matrix.php }}-composer-${{ hashFiles('**/composer.json') }}
diff --git a/.github/workflows/mutation.yml b/.github/workflows/mutation.yml
index aadd92315..d2b4aeb4c 100644
--- a/.github/workflows/mutation.yml
+++ b/.github/workflows/mutation.yml
@@ -40,7 +40,7 @@ jobs:
         run: echo "COMPOSER_CACHE_DIR=$(composer config cache-dir)" >> $GITHUB_ENV
 
       - name: Cache dependencies installed with composer
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.5
         with:
           path: ${{ env.COMPOSER_CACHE_DIR }}
           key: php${{ matrix.php }}-composer-${{ hashFiles('**/composer.json') }}
diff --git a/.github/workflows/static.yml b/.github/workflows/static.yml
index 078ced776..8eecb34e2 100644
--- a/.github/workflows/static.yml
+++ b/.github/workflows/static.yml
@@ -33,7 +33,7 @@ jobs:
         run: echo "COMPOSER_CACHE_DIR=$(composer config cache-dir)" >> $GITHUB_ENV
 
       - name: Cache dependencies installed with composer
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.5
         with:
           path: ${{ env.COMPOSER_CACHE_DIR }}
           key: php${{ matrix.php }}-composer-${{ hashFiles('**/composer.json') }}