diff --git a/.github/workflows/pr-ci.yaml b/.github/workflows/pr-ci.yaml
index 33b1380a..f0e5d222 100644
--- a/.github/workflows/pr-ci.yaml
+++ b/.github/workflows/pr-ci.yaml
@@ -6,6 +6,7 @@ on:
       - 1.x
       - 2.x
       - 3.x
+      - 4.x
 
 jobs:
   build: