AWS CloudFormationでデプロイしたAPI Gatewayが更新されない

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: ...
Resources:
  Api:
    Type: AWS::Serverless::Api
    Properties:
      StageName: dev
      DefinitionBody:
        Fn::Transform:
          Name: AWS::Include
          Parameters:
            Location: !Sub s3://${CfnBucketName}/${AWS::StackName}/src/api/swagger.yaml

swagger: "2.0"
info:
  version: "2018-09-04T22:25:14Z"
  title: "title"
basePath: "/dev"
schemes:
- "https"

paths:
  /token:
    options:
      consumes:
      - "application/json"
      produces:
      - "application/json"
      responses:
        200:
          description: "200 response"
          schema:
            $ref: "#/definitions/Empty"
          headers:
            Access-Control-Allow-Origin:
              type: "string"
            Access-Control-Allow-Methods:
              type: "string"
            Access-Control-Allow-Headers:
              type: "string"
      x-amazon-apigateway-integration:
        responses:
          default:
            statusCode: "200"
            responseParameters:
              method.response.header.Access-Control-Allow-Methods: "'DELETE,GET,HEAD,OPTIONS,PATCH,POST,PUT'"
              method.response.header.Access-Control-Allow-Headers: "'Content-Type,Authorization,X-Amz-Date,X-Api-Key,X-Amz-Security-Token'"
              method.response.header.Access-Control-Allow-Origin:
                Fn::Sub: "'${AllowOrigins}'"
        requestTemplates:
          application/json: "{\"statusCode\": 200}"
        passthroughBehavior: "when_no_match"
        type: "mock"