diff --git a/packages/@aws-cdk/cfnspec/CHANGELOG.md b/packages/@aws-cdk/cfnspec/CHANGELOG.md
index 00bc8552e8367..4f3775440e943 100644
--- a/packages/@aws-cdk/cfnspec/CHANGELOG.md
+++ b/packages/@aws-cdk/cfnspec/CHANGELOG.md
@@ -1,3 +1,19 @@
+
+# Serverless Application Model (SAM) Resource Specification v2016-10-31
+
+## New Resource Types
+
+
+## Attribute Changes
+
+
+## Property Changes
+
+* AWS::Serverless::Function Architectures (__added__)
+
+## Property Type Changes
+
+
 # CloudFormation Resource Specification v51.0.0
 
 ## New Resource Types
diff --git a/packages/@aws-cdk/cfnspec/spec-source/specification/100_sam/000_official/spec.json b/packages/@aws-cdk/cfnspec/spec-source/specification/100_sam/000_official/spec.json
index 5510475b3e7d2..71c213777a0cf 100644
--- a/packages/@aws-cdk/cfnspec/spec-source/specification/100_sam/000_official/spec.json
+++ b/packages/@aws-cdk/cfnspec/spec-source/specification/100_sam/000_official/spec.json
@@ -1972,6 +1972,13 @@
         "AWS::Serverless::Function": {
             "Documentation": "https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction",
             "Properties": {
+                "Architectures": {
+                    "Documentation": "https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-function.html#sam-function-architectures",
+                    "PrimitiveItemType": "String",
+                    "Required": false,
+                    "Type": "List",
+                    "UpdateType": "Immutable"
+                },
                 "AssumeRolePolicyDocument": {
                     "Documentation": "https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-function.html#sam-function-assumerolepolicydocument",
                     "PrimitiveType": "Json",