diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index d0dab785..fe9ca10e 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -2,12 +2,15 @@ name: PyTest
 
 on:
   pull_request:
-    # The branches below must be a subset of the branches above
     branch: master
     paths:
       - '**.py'
       - '**/pytest.yaml'
-
+      
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+  
 jobs:
   test:
     runs-on: ${{ matrix.os }}