diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index 1065c0519..a09aa7a64 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -31,6 +31,11 @@ on:
   schedule:
     - cron: '0 0 * * *'
 
+concurrency:
+
+  group: ${{ github.head_ref || github.run_id }}-${{ github.workflow }}
+  cancel-in-progress: true
+
 jobs:
 
   addlicense:
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ed4a1b72d..5d311c819 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -31,6 +31,11 @@ on:
   schedule:
     - cron: '0 0 * * *'
 
+concurrency:
+
+  group: ${{ github.head_ref || github.run_id }}-${{ github.workflow }}
+  cancel-in-progress: true
+
 jobs:
 
   test_data: