diff --git a/.github/workflows/canary.yml b/.github/workflows/canary.yml
index ec1614ddf..d8a59cdbc 100644
--- a/.github/workflows/canary.yml
+++ b/.github/workflows/canary.yml
@@ -1,16 +1,12 @@
 name: Deploy Canary
-on:
-  push:
-    branches:
-      - main
-      - canary
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
+on:
+  pull_request:
+    types: [closed]
 
 jobs:
   deploy_canary:
+    if: github.event.pull_request.merged == true && github.event.pull_request.base.ref == 'canary'
     name: build
     timeout-minutes: 30
     runs-on: ubuntu-latest