diff --git a/.github/workflows/deploy-discovery.yml b/.github/workflows/deploy-discovery.yml
index 7c1fa14160..b6ae610881 100644
--- a/.github/workflows/deploy-discovery.yml
+++ b/.github/workflows/deploy-discovery.yml
@@ -8,11 +8,13 @@ on:
   repository_dispatch:
   push:
     branches: ["main"]
-  pull_request:
-    types: closed
-    branches: ["main"]
   workflow_dispatch:
 
+# One deploy at a time: concurrent runs race to force-push gh-pages
+concurrency:
+  group: deploy-gh-pages
+  cancel-in-progress: false
+
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest