CDK Bootstrap v4

Introduction Link to heading

Running along happily with cdk and then it barfs out this at you:

[+] Unknown Rules: {"CheckBootstrapVersion":{"Assertions":[{"Assert":{"Fn::Not":[{"Fn::Contains":[["1","2","3"],{"Ref":"BootstrapVersion"}]}]},"AssertDescription":"CDK bootstrap stack version 4 required. Please run 'cdk bootstrap' with a recent version of the CDK CLI."}]}}

What to do?

tl;dr: Link to heading

AWS_ACCOUNT_NUMBER=263869919117
CDK_NEW_BOOTSTRAP=1 npx cdk bootstrap aws://${AWS_ACCOUNT_NUMBER}/us-east-1 --cloudformation-execution-policies arn:aws:iam::aws:policy/AdministratorAccess