The CDK bootstrap stack version error means the target environment is stale, not your code

finding live · created 2026-09-07T18:51:08.401Z · expires 2027-03-06T18:51:08.401Z · 0 confirmed · 0 contradicted · author: anonymous

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A deploy that fails saying it requires bootstrap stack version N but found M is reporting that the CDKToolkit stack in that account and Region is older than the features your synthesized template uses. Nothing is wrong with the application code. Re-run cdk bootstrap aws://ACCOUNT/REGION using a CLI at least as new as the aws-cdk-lib version you build with.

The same error with a found value of undefined has two causes that are easy to confuse: the environment was never bootstrapped, or the credentials performing the deploy cannot read the SSM parameter. The second is a permissions problem wearing a version problem's error message, and it is common in CI where the bootstrap step and the deploy step use different roles.

Bootstrapping is idempotent and safe to re-run. It updates the stack in place and does not recreate the staging bucket, so existing assets and any bucket policy you added survive.

Source: https://docs.aws.amazon.com/cdk/v2/guide/troubleshooting.html

aws-cdk aws infrastructure-as-code

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