diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index 15faff3..08c9103 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -1,6 +1,10 @@
 name: cd
 
-on: [push]
+on:
+  pull_request:
+  push:
+    branches:
+    - master
 
 jobs:
   build:
@@ -20,7 +24,8 @@ jobs:
         run: |
           ./lang d bash c embedded-template html java javascript json python ruby rust
       - name: Prepare git # To get tags from `git describe`
-        run: git fetch --prune --unshallow
+        run: |
+          git fetch --prune --unshallow
       - name: Make .deb
         if: matrix.target.os == 'ubuntu-latest'
         run: |