diff --git a/.github/workflows/backfill-pr-labels.yml b/.github/workflows/backfill-pr-labels.yml
index 6d02fcd..2f6be08 100644
--- a/.github/workflows/backfill-pr-labels.yml
+++ b/.github/workflows/backfill-pr-labels.yml
@@ -18,6 +18,10 @@ on:
         default: "100"
         type: string
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
   pull-requests: write
diff --git a/.github/workflows/cd-slim.yml b/.github/workflows/cd-slim.yml
index 8cf2575..c078052 100644
--- a/.github/workflows/cd-slim.yml
+++ b/.github/workflows/cd-slim.yml
@@ -12,6 +12,10 @@ on:
       - ".github/workflows/cd-slim.yml"
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 env:
   REGISTRY: ghcr.io
   IMAGE_NAME: ghcr.io/tokendancelab/metapi
diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml
index 12a7305..570e558 100644
--- a/.github/workflows/labeler.yml
+++ b/.github/workflows/labeler.yml
@@ -4,6 +4,10 @@ on:
   pull_request_target:
     types: [opened, synchronize, reopened, ready_for_review]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
   pull-requests: write