diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 3e811072ff..f86990b5a7 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -7,6 +7,11 @@ on:
       - master
   workflow_dispatch:
 
+# Free runner capacity by cancelling superseded PR runs.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   lint:
     name: Lint