diff --git a/.github/workflows/diagnostics.yml b/.github/workflows/diagnostics.yml
index 36b17bb..25715c3 100644
--- a/.github/workflows/diagnostics.yml
+++ b/.github/workflows/diagnostics.yml
@@ -42,7 +42,7 @@ jobs:
           php-version: ${{ matrix.php }}
 
       - name: Cache composer cache directory
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         env:
           cache-name: composer-cache-dir-${{ matrix.php }}
         with:
@@ -53,7 +53,7 @@ jobs:
         run: composer install
 
       - name: Cache vendor directory
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         env:
           cache-name: vendor-${{ matrix.php }}
         with:
@@ -66,7 +66,7 @@ jobs:
         run: ./vendor/bin/phpcq ${{ matrix.phpcq_install }} -v
 
       - name: Cache phpcq directory
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         env:
           cache-name: phpcq-${{ matrix.php }}
         with: