diff --git a/.github/workflows/sphinx.yaml b/.github/workflows/sphinx.yaml
index 0d498a87..c5f16946 100644
--- a/.github/workflows/sphinx.yaml
+++ b/.github/workflows/sphinx.yaml
@@ -1,6 +1,12 @@
 name: "Sphinx: Render docs"
 
-on: push
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  release:
+    types: [published]
 
 # Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
 permissions:
@@ -44,6 +50,8 @@ jobs:
 
   deploy:
     # Deploy to the github-pages environment
+    # but not on PRs
+    if: ${{ github.event_name != 'pull_request' }}
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}