diff --git a/.github/workflows/pr-ci.yaml b/.github/workflows/pr-ci.yaml
index 9c0f68226..1a8d7f14a 100644
--- a/.github/workflows/pr-ci.yaml
+++ b/.github/workflows/pr-ci.yaml
@@ -4,6 +4,7 @@ on:
   pull_request:
     branches:
       - 3.x
+      - 4.x
 
 jobs:
   build: