diff --git a/packages/@aws-cdk/cfnspec/CHANGELOG.md b/packages/@aws-cdk/cfnspec/CHANGELOG.md
index ae7be92395bca..714b8cbd42283 100644
--- a/packages/@aws-cdk/cfnspec/CHANGELOG.md
+++ b/packages/@aws-cdk/cfnspec/CHANGELOG.md
@@ -1,3 +1,8 @@
+
+## Unapplied changes
+
+* AWS::ECS is at 51.0.0
+
 # CloudFormation Resource Specification v53.1.0
 
 ## New Resource Types