diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7713db34..8c975c17 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,6 +13,10 @@ jobs:
     name: >-
       ${{matrix.os}}, ${{matrix.ruby}}
 
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}-${{matrix.os}}-${{matrix.ruby}}-libev
+      cancel-in-progress: true
+
     runs-on: ${{matrix.os}}
 
     env:
diff --git a/.github/workflows/test_io_uring.yml b/.github/workflows/test_io_uring.yml
index 5b111cc2..7b945d22 100644
--- a/.github/workflows/test_io_uring.yml
+++ b/.github/workflows/test_io_uring.yml
@@ -13,7 +13,12 @@ jobs:
     name: >-
       ${{matrix.os}}, ${{matrix.ruby}}
 
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}-${{matrix.os}}-${{matrix.ruby}}-io_uring
+      cancel-in-progress: true
+
     runs-on: ${{matrix.os}}
+
     steps:
     - name: Checkout repository and submodules
       uses: actions/checkout@v4