diff --git a/.github/workflows/hakari.yml b/.github/workflows/hakari.yml
index 11aa638ace..e0fb071fa3 100644
--- a/.github/workflows/hakari.yml
+++ b/.github/workflows/hakari.yml
@@ -4,9 +4,8 @@ on:
   push:
     branches:
       - main
-  pull_request:
-    branches:
-      - main
+      - 'rel/**'
+  pull_request: {}
 
 name: cargo hakari
 
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 88b8660499..8bfb499726 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -3,7 +3,12 @@
 #
 name: Rust
 
-on: [ push, pull_request ]
+on:
+  push:
+    branches:
+      - main
+      - 'rel/**'
+  pull_request: {}
 
 jobs:
   check-style: