diff --git a/types/aws-lambda-mock-context/index.d.ts b/types/aws-lambda-mock-context/index.d.ts
index 6fc5fda67a..b5a3768f2d 100644
--- a/types/aws-lambda-mock-context/index.d.ts
+++ b/types/aws-lambda-mock-context/index.d.ts
@@ -26,10 +26,10 @@ interface Context {
 }
 
 interface Options {
-    region: string;
-    account: string;
-    functionName: string;
-    functionVersion: string;
-    memoryLimitInMB: string;
+    region?: string;
+    account?: string;
+    functionName?: string;
+    functionVersion?: string;
+    memoryLimitInMB?: string;
     alias?: string;
 }