diff --git a/.github/workflows/diagnostics.yml b/.github/workflows/diagnostics.yml
index 8b4d40a..b16fe7e 100644
--- a/.github/workflows/diagnostics.yml
+++ b/.github/workflows/diagnostics.yml
@@ -30,7 +30,7 @@ jobs:
           php-version: ${{ matrix.php }}
 
       - name: Cache composer cache directory
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         env:
           cache-name: composer-cache-dir
         with:
@@ -38,7 +38,7 @@ jobs:
           key: ${{ runner.os }}-${{ matrix.php }}-build-${{ env.cache-name }}
 
       - name: Cache vendor directory
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         env:
           cache-name: vendor
         with:
@@ -48,7 +48,7 @@ jobs:
             ${{ runner.os }}-${{ matrix.php }}-build-${{ env.cache-name }}-
 
       - name: Cache phpcq directory
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         env:
           cache-name: phpcq
         with: