diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 454de85a..2c820649 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -2,6 +2,8 @@ name: test
 
 on:
   push:
+    branches:
+      - master
   pull_request:
   workflow_dispatch:
 
@@ -29,7 +31,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Install shellcheck
-      run: apt-get install shellcheck make
+      run: sudo apt-get update && sudo apt-get install -y shellcheck make
 
     - name: Run lint
       run: make lint