diff --git a/.github/workflows/diagnostics.yml b/.github/workflows/diagnostics.yml
index 55ec892..d3758cd 100644
--- a/.github/workflows/diagnostics.yml
+++ b/.github/workflows/diagnostics.yml
@@ -25,7 +25,7 @@ jobs:
           coverage: xdebug3
 
       - name: Cache composer cache directory
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         env:
           cache-name: composer-cache-dir
         with:
@@ -36,7 +36,7 @@ jobs:
         run: composer install
 
       - name: Cache vendor directory
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         env:
           cache-name: vendor
         with:
@@ -49,7 +49,7 @@ jobs:
         run: $GITHUB_WORKSPACE/vendor/bin/phpcq install -v
 
       - name: Cache phpcq directory
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         env:
           cache-name: phpcq
         with: