diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 15f6394..76bdc10 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -2,10 +2,13 @@ name: Python
 
 on:
   push:
-    branches:
-      - main
   pull_request:
 
+# Superseded runs on the same ref are cancelled (e.g. rapid amend-pushes)
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   detect-packages:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/typescript.yml b/.github/workflows/typescript.yml
index 154d5ad..e56ddd9 100644
--- a/.github/workflows/typescript.yml
+++ b/.github/workflows/typescript.yml
@@ -2,10 +2,13 @@ name: TypeScript
 
 on:
   push:
-    branches:
-      - main
   pull_request:
 
+# Superseded runs on the same ref are cancelled (e.g. rapid amend-pushes)
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   detect-packages:
     runs-on: ubuntu-latest