diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5e2a8bb9f..651be77c2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,8 +1,8 @@
 name: CI
 
 on:
+  # Every base, so stacked pull requests are checked against the PR below them.
   pull_request:
-    branches: [master]
 
 permissions:
   contents: read
diff --git a/.github/workflows/pr-title.yml b/.github/workflows/pr-title.yml
index cad35b964..8c893a608 100644
--- a/.github/workflows/pr-title.yml
+++ b/.github/workflows/pr-title.yml
@@ -1,8 +1,8 @@
 name: PR title
 
 on:
+  # Every base, so stacked pull requests are checked against the PR below them.
   pull_request:
-    branches: [master]
     types: [opened, synchronize, reopened, edited]
 
 permissions: