diff --git a/packages/aws-cdk/lib/api/bootstrap/bootstrap-template.yaml b/packages/aws-cdk/lib/api/bootstrap/bootstrap-template.yaml
index 571f239823a5c..dace6e7977a4a 100644
--- a/packages/aws-cdk/lib/api/bootstrap/bootstrap-template.yaml
+++ b/packages/aws-cdk/lib/api/bootstrap/bootstrap-template.yaml
@@ -623,7 +623,7 @@ Resources:
       Type: String
       Name:
         Fn::Sub: '/cdk-bootstrap/${Qualifier}/version'
-      Value: '20'
+      Value: '21'
 Outputs:
   BucketName:
     Description: The name of the S3 bucket owned by the CDK toolkit stack