diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index c508bf0..1094aa6 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -1,6 +1,9 @@
 name: docker
 
-on: [push]
+on:
+  push:
+    branches:
+      - master
 
 jobs:
   build: