diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 4be94e55..6c1f17c8 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [ master ]
+    branches: [ master, 3.x ]
   pull_request:
-    branches: [ master ]
+    branches: [ master, 3.x ]
 
 jobs:
   build: