diff --git a/packages/@aws-cdk/cfnspec/CHANGELOG.md b/packages/@aws-cdk/cfnspec/CHANGELOG.md
index 4f368495066d3..216f3c2f975e0 100644
--- a/packages/@aws-cdk/cfnspec/CHANGELOG.md
+++ b/packages/@aws-cdk/cfnspec/CHANGELOG.md
@@ -1,38 +1,3 @@
-# CloudFormation Resource Specification v39.1.0
-
-## New Resource Types
-
-
-## Attribute Changes
-
-* AWS::AuditManager::Assessment FrameworkId (__deleted__)
-* AWS::EC2::TransitGateway Id (__added__)
-
-## Property Changes
-
-* AWS::AutoScaling::AutoScalingGroup Context (__added__)
-* AWS::EC2::NatGateway ConnectivityType (__added__)
-* AWS::EC2::NatGateway AllocationId.Required (__changed__)
-  * Old: true
-  * New: false
-* AWS::EC2::TransitGateway Tags.DuplicatesAllowed (__added__)
-* AWS::Lambda::Function Id (__deleted__)
-* AWS::Lambda::LayerVersion CompatibleArchitectures (__deleted__)
-* AWS::RAM::ResourceShare PermissionArns (__added__)
-* AWS::SQS::Queue DeduplicationScope (__added__)
-* AWS::SQS::Queue FifoThroughputLimit (__added__)
-* AWS::SageMaker::CodeRepository Tags (__added__)
-
-## Property Type Changes
-
-* AWS::SSMContacts::Contact.ChannelTargetInfo (__added__)
-* AWS::SSMContacts::Contact.ContactTargetInfo (__added__)
-* AWS::SSMContacts::Contact.Targets ChannelTargetInfo.PrimitiveType (__deleted__)
-* AWS::SSMContacts::Contact.Targets ChannelTargetInfo.Type (__added__)
-* AWS::SSMContacts::Contact.Targets ContactTargetInfo.PrimitiveType (__deleted__)
-* AWS::SSMContacts::Contact.Targets ContactTargetInfo.Type (__added__)
-
-
 # CloudFormation Resource Specification v38.0.0
 
 ## New Resource Types
diff --git a/packages/@aws-cdk/cfnspec/cfn.version b/packages/@aws-cdk/cfnspec/cfn.version
index b0440a7d2a4fb..531d2a40b95b9 100644
--- a/packages/@aws-cdk/cfnspec/cfn.version
+++ b/packages/@aws-cdk/cfnspec/cfn.version
@@ -1 +1 @@
-39.1.0
+38.0.0
diff --git a/packages/@aws-cdk/cfnspec/spec-source/000_CloudFormationResourceSpecification.json b/packages/@aws-cdk/cfnspec/spec-source/000_CloudFormationResourceSpecification.json
index c19f34263b04b..b5eb8fd87c731 100644
--- a/packages/@aws-cdk/cfnspec/spec-source/000_CloudFormationResourceSpecification.json
+++ b/packages/@aws-cdk/cfnspec/spec-source/000_CloudFormationResourceSpecification.json
@@ -60043,7 +60043,7 @@
       }
     }
   },
-  "ResourceSpecificationVersion": "39.1.0",
+  "ResourceSpecificationVersion": "38.0.0",
   "ResourceTypes": {
     "AWS::ACMPCA::Certificate": {
       "Attributes": {