diff --git a/.github/workflows/publish-docker-image.yml b/.github/workflows/publish-docker-image.yml
index 3cd47ad..a52f26e 100644
--- a/.github/workflows/publish-docker-image.yml
+++ b/.github/workflows/publish-docker-image.yml
@@ -1,5 +1,7 @@
 name: Publish Docker image to GitHub Package Registry
-on: push
+on:
+  push:
+    branches: [ "master" ]
 jobs:
   build:
     runs-on: ubuntu-latest