diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 820451b..868f3f3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,7 +11,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  RUNTIME_VERSION: 17
+  RUNTIME_VERSION: 11
 
 jobs:
   build:
@@ -23,14 +23,14 @@ jobs:
     runs-on: "${{ matrix.os }}"
     steps:
       - name: "checkout repository"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: "setup jdk ${{ env.RUNTIME_VERSION }}"
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           distribution: "temurin"
           java-version: "${{ env.RUNTIME_VERSION }}"
       - name: "run gradle build"
         uses: "gradle/gradle-build-action@v2"
         with:
-          cache-read-only: "${{ github.ref != 'refs/heads/main' || github.event_name == 'pull_request' }}"
+          cache-read-only: "${{ !startsWith(github.ref, 'refs/heads/main/') || github.event_name == 'pull_request' }}"
           arguments: "build"
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
deleted file mode 100644
index 2248e15..0000000
--- a/.github/workflows/validate.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-name: "validate gradle wrapper"
-
-on: ["pull_request", "push"]
-
-jobs:
-  build:
-    runs-on: "ubuntu-latest"
-    steps:
-      - name: "checkout repository"
-        uses: actions/checkout@v3
-      - name: "validate gradle wrapper"
-        uses: "gradle/wrapper-validation-action@v1"