diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index e42527e1..c19130c8 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -2,17 +2,15 @@ name: C/C++ CI
 
 on:
   push:
-    branches: [ master ]
   pull_request:
-    branches: [ master ]
 
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
     - name: make
       run: make -j
     - name: make test