diff --git a/.github/workflows/diagnostics.yml b/.github/workflows/diagnostics.yml
index 3c43933..d335939 100644
--- a/.github/workflows/diagnostics.yml
+++ b/.github/workflows/diagnostics.yml
@@ -35,7 +35,7 @@ jobs:
           coverage: xdebug2
 
       - name: Cache composer cache directory
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         env:
           cache-name: composer-cache-dir-${{ matrix.php }}
         with:
@@ -46,7 +46,7 @@ jobs:
         run: composer install
 
       - name: Cache vendor directory of phpcq tool runner
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         env:
           cache-name: vendor-${{ matrix.php }}
         with: