diff --git a/.github/workflows/scala3-build.yml b/.github/workflows/scala3-build.yml
index 1317dd5913..77c016e627 100644
--- a/.github/workflows/scala3-build.yml
+++ b/.github/workflows/scala3-build.yml
@@ -7,6 +7,12 @@ on:
       - master
     tags-ignore: [ v.* ]
 
+
+concurrency:
+  # Only run once for latest commit per ref and cancel other (previous) runs.
+  group: ci-scala3-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     name: Test