diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 370c6172..718510c7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,6 +6,10 @@ on:
   pull_request:
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     uses: OpenAstronomy/github-actions-workflows/.github/workflows/publish.yml@v1
diff --git a/.github/workflows/ci_cron.yml b/.github/workflows/ci_cron.yml
index 6289032a..0afa0045 100644
--- a/.github/workflows/ci_cron.yml
+++ b/.github/workflows/ci_cron.yml
@@ -6,6 +6,10 @@ on:
     - cron: "0 0 * * 1"
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@v1