diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5cdc86f..b763248 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
   # allow manual execution from the web interface
   workflow_dispatch:
@@ -14,13 +14,14 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-20.04', 'ubuntu-22.04']
+        toolchain: ['oldstable', 'stable']
 
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2 # respository path: $GITHUB_WORKSPACE
-      - uses: actions/setup-go@v2
+      - uses: actions/setup-go@v5
         with:
-          go-version: 1.21
+          go-version: ${{ matrix.toolchain }}
 
       - name: Install golint
         run: go install golang.org/x/lint/golint@latest