diff --git a/.github/workflows/auto-approve.yml b/.github/workflows/auto-approve.yml
index f7dc050..1636b6f 100644
--- a/.github/workflows/auto-approve.yml
+++ b/.github/workflows/auto-approve.yml
@@ -8,7 +8,8 @@ on:
       - labeled
       - ready_for_review
       - reopened
-concurrency: {}
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
 jobs:
   approve:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/automerge.yml b/.github/workflows/automerge.yml
index 923c133..b027076 100644
--- a/.github/workflows/automerge.yml
+++ b/.github/workflows/automerge.yml
@@ -9,7 +9,8 @@ on:
       - ready_for_review
       - reopened
       - synchronize
-concurrency: {}
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
 jobs:
   automerge:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/upgrade-cdktf.yml b/.github/workflows/upgrade-cdktf.yml
index 6fc3926..2eed38d 100644
--- a/.github/workflows/upgrade-cdktf.yml
+++ b/.github/workflows/upgrade-cdktf.yml
@@ -5,7 +5,8 @@ on:
   schedule:
     - cron: 35 */6 * * *
   workflow_dispatch: {}
-concurrency: {}
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
 jobs:
   upgrade:
     name: Upgrade CDKTF
diff --git a/projenrc/auto-approve.ts b/projenrc/auto-approve.ts
index b560b4b..29d0f42 100644
--- a/projenrc/auto-approve.ts
+++ b/projenrc/auto-approve.ts
@@ -21,8 +21,9 @@ export class AutoApprove {
       },
     });
 
-    (workflow.concurrency as any) =
-      "${{ github.workflow }}-${{ github.head_ref }}";
+    (workflow.concurrency as any) = {
+      group: "${{ github.workflow }}-${{ github.ref }}",
+    };
 
     const maintainerStatuses = `fromJSON('["OWNER", "MEMBER", "COLLABORATOR"]')`;
     workflow.addJobs({
diff --git a/projenrc/automerge.ts b/projenrc/automerge.ts
index b97534d..c710617 100644
--- a/projenrc/automerge.ts
+++ b/projenrc/automerge.ts
@@ -27,8 +27,9 @@ export class Automerge {
       },
     });
 
-    (workflow.concurrency as any) =
-      "${{ github.workflow }}-${{ github.head_ref }}";
+    (workflow.concurrency as any) = {
+      group: "${{ github.workflow }}-${{ github.ref }}",
+    };
 
     const maintainerStatuses = `fromJSON('["OWNER", "MEMBER", "COLLABORATOR"]')`;
     workflow.addJobs({
diff --git a/projenrc/upgrade-cdktf.ts b/projenrc/upgrade-cdktf.ts
index 28d30e7..3df1aff 100644
--- a/projenrc/upgrade-cdktf.ts
+++ b/projenrc/upgrade-cdktf.ts
@@ -20,7 +20,9 @@ export class UpgradeCDKTF {
       workflowDispatch: {}, // allow manual triggering
     });
 
-    (workflow.concurrency as any) = "${{ github.workflow }}-${{ github.ref }}";
+    (workflow.concurrency as any) = {
+      group: "${{ github.workflow }}-${{ github.ref }}",
+    };
 
     workflow.addJobs({
       upgrade: {