diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 3554958..f368304 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -6,6 +6,10 @@ on:
       - master
   workflow_dispatch:
 
+concurrency:
+  group: deploy-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   REGISTRY: ghcr.io
   IMAGE_BACKEND: ghcr.io/agentage/web/backend
diff --git a/.github/workflows/pr-validation.yml b/.github/workflows/pr-validation.yml
index 1d359c2..eb8efde 100644
--- a/.github/workflows/pr-validation.yml
+++ b/.github/workflows/pr-validation.yml
@@ -13,6 +13,10 @@ on:
         type: boolean
         default: false
 
+concurrency:
+  group: pr-validation-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
   pull-requests: write