diff --git a/.github/workflows/diagnostics.yml b/.github/workflows/diagnostics.yml
index 229cf1d..4a7ea8a 100644
--- a/.github/workflows/diagnostics.yml
+++ b/.github/workflows/diagnostics.yml
@@ -40,7 +40,7 @@ jobs:
           php-version: ${{ matrix.php }}
 
       - name: PHP ${{ matrix.php }} Cache composer cache directory
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         env:
           cache-name: composer-cache-dir-${{ matrix.php }}
         with:
@@ -48,7 +48,7 @@ jobs:
           key: ${{ runner.os }}-build-${{ env.cache-name }}
 
       - name: PHP ${{ matrix.php }} Cache vendor directory
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         env:
           cache-name: composer-vendor-${{ matrix.php }}
         with: