diff --git a/.github/workflows/setup-conda.yml b/.github/workflows/setup-conda.yml
index dc351b5..79b4a98 100644
--- a/.github/workflows/setup-conda.yml
+++ b/.github/workflows/setup-conda.yml
@@ -7,6 +7,11 @@ on:
   pull_request:
     branches: [ main ]
 
+# Cancel previous runs that have not completed
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   conda:
     strategy: