diff --git a/types/auth0-lock/index.d.ts b/types/auth0-lock/index.d.ts
index 8c3a7da850..38763cb578 100644
--- a/types/auth0-lock/index.d.ts
+++ b/types/auth0-lock/index.d.ts
@@ -5,6 +5,7 @@
 //                 Larry Faudree <https://github.com/lfaudreejr>
 //                 Will Caulfield <https://github.com/willcaul>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
 
 /// <reference types="auth0-js" />