diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e225f5b..86d7e3b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -2,7 +2,10 @@ name: Test and Publish
 
 
 on:
-  push
+  push:
+  pull_request:
+    branches:
+      - main
 
 permissions:
   contents: read
@@ -11,6 +14,8 @@ jobs:
   test:
     name: run-tests
     runs-on: ubuntu-latest
+    if: github.event_name != 'pull_request' ||
+      github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     strategy:
       matrix:
         python-version: