diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index b8e0c0c0b..3bcd2581a 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -10,6 +10,11 @@ on:
       - master
     paths-ignore:
       - 'docs/**'
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
 jobs:
   test:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/Downstream.yml b/.github/workflows/Downstream.yml
index f8110ab41..b977c8409 100644
--- a/.github/workflows/Downstream.yml
+++ b/.github/workflows/Downstream.yml
@@ -4,7 +4,11 @@ on:
     branches: [master]
     tags: [v*]
   pull_request:
-
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
 jobs:
   test:
     name: ${{ matrix.package.repo }}/${{ matrix.package.group }}/${{ matrix.julia-version }}