diff --git a/.github/workflows/anaconda_tests.yml b/.github/workflows/anaconda_tests.yml
index 2a94c3c60..0bcc92afd 100644
--- a/.github/workflows/anaconda_tests.yml
+++ b/.github/workflows/anaconda_tests.yml
@@ -1,5 +1,8 @@
 name: Run validation tests from Anaconda
-on: pull_request
+on:
+  pull_request:
+    branches:
+     - main
 
 permissions:
   contents: read