diff --git a/types/aws-lambda/aws-lambda-tests.ts b/types/aws-lambda/aws-lambda-tests.ts
index 94575006ab..3e0ded1681 100644
--- a/types/aws-lambda/aws-lambda-tests.ts
+++ b/types/aws-lambda/aws-lambda-tests.ts
@@ -400,10 +400,10 @@ cognitoUserPoolEvent.request.session![0].challengeName === "DEVICE_SRP_AUTH";
 cognitoUserPoolEvent.request.session![0].challengeName === "DEVICE_PASSWORD_VERIFIER";
 cognitoUserPoolEvent.request.session![0].challengeName === "ADMIN_NO_SRP_AUTH";
 bool = cognitoUserPoolEvent.request.session![0].challengeResult;
-strOrUndefined = cognitoUserPoolEvent.request.session![0].challengeMetaData;
+strOrUndefined = cognitoUserPoolEvent.request.session![0].challengeMetadata;
 strOrUndefined = cognitoUserPoolEvent.request.challengeName;
 str = cognitoUserPoolEvent.request.privateChallengeParameters!["answer"];
-str = cognitoUserPoolEvent.request.challengeAnswer!["answer"];
+str = cognitoUserPoolEvent.request.challengeAnswer!;
 boolOrUndefined = cognitoUserPoolEvent.response.answerCorrect;
 strOrUndefined = cognitoUserPoolEvent.response.smsMessage;
 strOrUndefined = cognitoUserPoolEvent.response.emailMessage;
@@ -413,7 +413,7 @@ boolOrUndefined = cognitoUserPoolEvent.response.issueTokens;
 boolOrUndefined = cognitoUserPoolEvent.response.failAuthentication;
 str = cognitoUserPoolEvent.response.publicChallengeParameters!["captchaUrl"];
 str = cognitoUserPoolEvent.response.privateChallengeParameters!["answer"];
-strOrUndefined = cognitoUserPoolEvent.response.challengeMetaData;
+strOrUndefined = cognitoUserPoolEvent.response.challengeMetadata;
 boolOrUndefined = cognitoUserPoolEvent.response.answerCorrect;
 
 // CloudFormation Custom Resource
diff --git a/types/aws-lambda/index.d.ts b/types/aws-lambda/index.d.ts
index 35d0b1d7a6..093fd763dd 100644
--- a/types/aws-lambda/index.d.ts
+++ b/types/aws-lambda/index.d.ts
@@ -250,11 +250,11 @@ export interface CognitoUserPoolTriggerEvent {
         session?: Array<{
             challengeName: "CUSTOM_CHALLENGE" | "PASSWORD_VERIFIER" | "SMS_MFA" | "DEVICE_SRP_AUTH" | "DEVICE_PASSWORD_VERIFIER" | "ADMIN_NO_SRP_AUTH";
             challengeResult: boolean;
-            challengeMetaData?: string;
+            challengeMetadata?: string;
         }>;
         challengeName?: string;
         privateChallengeParameters?: { [key: string]: string };
-        challengeAnswer?: { [key: string]: string };
+        challengeAnswer?: string;
     };
     response: {
         autoConfirmUser?: boolean;
@@ -266,7 +266,7 @@ export interface CognitoUserPoolTriggerEvent {
         failAuthentication?: boolean;
         publicChallengeParameters?: { [key: string]: string };
         privateChallengeParameters?: { [key: string]: string };
-        challengeMetaData?: string;
+        challengeMetadata?: string;
         answerCorrect?: boolean;
     };
 }