diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 29295b7..dd93a60 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -1,6 +1,9 @@
 name: publish
 
-on: [push]
+on:
+  push:
+    branches:
+      - master
 
 jobs:
   publish-image: