diff --git a/CHANGELOG.md b/CHANGELOG.md
index 260a03d..b57bd6d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,7 @@
 ### 2.11.0 (Sep 12, 2020)
 - [ADD] Added support for aliases in `Parser#is` method (#437)
 - [ADD] Added more typings (#438, #427)
-- [ADD] Added support for MIUI Browserr (#436)
+- [ADD] Added support for MIUI Browser (#436)
 
 ### 2.10.0 (Jul 9, 2020)
 - [FIX] Fix for Firefox detection on iOS 13 [#415]
diff --git a/index.d.ts b/index.d.ts
index d95656a..acf7d68 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -54,7 +54,7 @@ declare namespace Bowser {
        * @return {String} version of browser
        */
 
-      getBrowserVersion(): string;
+      getBrowserVersion(): string | undefined;
 
       /**
        * Get OS