CHANGELOG.md in aws-sdk-cloud9-1.38.0 vs CHANGELOG.md in aws-sdk-cloud9-1.39.0

@@ -1,7 +1,12 @@
 Unreleased Changes
 ------------------
 
+1.39.0 (2021-09-01)
+------------------
+
+* Feature - Code Generated Changes, see `./build_tools` or `aws-sdk-core`'s CHANGELOG.md for details.
+
 1.38.0 (2021-08-17)
 ------------------
 
 * Feature - Added DryRun parameter to CreateEnvironmentEC2 API. Added ManagedCredentialsActions parameter to UpdateEnvironment API
 
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