diff --git a/.github/workflows/analyze.yml b/.github/workflows/analyze.yml
index 2a25072a..b42393ab 100644
--- a/.github/workflows/analyze.yml
+++ b/.github/workflows/analyze.yml
@@ -2,6 +2,10 @@ name: Analyze
 
 on: [push, pull_request]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   decomplint-isle:
     name: ${{ matrix.who }} annotations
diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index 74424665..0c351c79 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -2,6 +2,10 @@ name: Format
 
 on: [push, pull_request]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   clang-format:
     name: C++