diff --git a/.github/workflows/claude-code-review.yml b/.github/workflows/claude-code-review.yml
index 72005bb..261c4d5 100644
--- a/.github/workflows/claude-code-review.yml
+++ b/.github/workflows/claude-code-review.yml
@@ -10,6 +10,11 @@ on:
       - ".gitignore"
       - "pyproject.toml"
 
+# Cancel in-progress runs for the same PR to avoid duplicate reviews
+concurrency:
+  group: claude-code-review-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
 jobs:
   claude-review:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
index d2d6008..2415882 100644
--- a/.github/workflows/claude.yml
+++ b/.github/workflows/claude.yml
@@ -10,6 +10,11 @@ on:
   pull_request_review:
     types: [submitted]
 
+# Cancel in-progress runs for the same issue/PR to avoid duplicate responses
+concurrency:
+  group: claude-${{ github.event.issue.number || github.event.pull_request.number }}
+  cancel-in-progress: true
+
 jobs:
   claude:
     if: |
diff --git a/.github/workflows/opencode-review.yml b/.github/workflows/opencode-review.yml
index aaf0837..e8dea3b 100644
--- a/.github/workflows/opencode-review.yml
+++ b/.github/workflows/opencode-review.yml
@@ -11,6 +11,11 @@ on:
       - ".gitignore"
       - "pyproject.toml"
 
+# Cancel in-progress runs for the same PR to avoid duplicate reviews
+concurrency:
+  group: opencode-review-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
 jobs:
   opencode-review:
     runs-on: ubuntu-latest