diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 75bd4e2fb8a8fcc626636b1abec6e6fd7a2c3043..7c841777c9fd95e6e923b082736f2048a7b9fb04 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -4,6 +4,10 @@ on:
   push:
     branches: 
       - master
+concurrency: 
+  # Cancels pending runs when a PR gets updated.
+  group: ${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 jobs:
   x86_64-linux-debug:
     outputs: