diff --git a/.github/workflows/system-tests.yml b/.github/workflows/system-tests.yml
index 982b11d9e97..87182564624 100644
--- a/.github/workflows/system-tests.yml
+++ b/.github/workflows/system-tests.yml
@@ -4,6 +4,9 @@ on:
   push:
     branches:
       - "**"
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ '**' ]
   workflow_dispatch: {}
   schedule:
     - cron:  '00 04 * * 2-6'
diff --git a/.github/workflows/test-head.yaml b/.github/workflows/test-head.yaml
index 2a1b54fa196..f8822ecab47 100644
--- a/.github/workflows/test-head.yaml
+++ b/.github/workflows/test-head.yaml
@@ -1,5 +1,5 @@
 name: Test unstable
-on: [push]
+on: [push, pull_request]
 jobs:
   test-head:
     strategy:
diff --git a/.github/workflows/test-macos.yaml b/.github/workflows/test-macos.yaml
index ac43afc1075..f6c8291e960 100644
--- a/.github/workflows/test-macos.yaml
+++ b/.github/workflows/test-macos.yaml
@@ -5,7 +5,7 @@ on:
       - "**"
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [ master ]
+    branches: [ "**" ]
 jobs:
   test-macos:
     strategy:
diff --git a/.github/workflows/test-yjit.yaml b/.github/workflows/test-yjit.yaml
index 2b3e1c554aa..e5a286c064b 100644
--- a/.github/workflows/test-yjit.yaml
+++ b/.github/workflows/test-yjit.yaml
@@ -1,5 +1,5 @@
 name: Test YJIT
-on: [push]
+on: [push, pull_request]
 jobs:
   test-yjit:
     strategy: