diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0f298f..364cb6a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes will be documented in this file.
 
+## [1.0.9] - 2023-01-16
+
+* Fix localization backward compatibility.
+
 ## [1.0.8] - 2023-01-16
 
 * Add support for update message localization.
diff --git a/package.json b/package.json
index 47d451e..163d92d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "app-upgrade-react-native-sdk",
-  "version": "1.0.8",
+  "version": "1.0.9",
   "description": "app upgrade react-native sdk",
   "main": "index.js",
   "scripts": {
diff --git a/src/api.js b/src/api.js
index 89f80e8..80b5bc4 100644
--- a/src/api.js
+++ b/src/api.js
@@ -3,10 +3,10 @@ import axios from "axios";
 async function checkVersionWithAppUpgrade(appInfo, xApiKey) {
   try {
     const appUpgradeBaseUrl = "https://appupgrade.dev";
-    const { appName, appVersion, platform, environment } = appInfo;
+    const { appName, appVersion, platform, environment, appLanguage } = appInfo;
 
     const response = await axios.get(
-      `${appUpgradeBaseUrl}/api/v1/versions/check?app_name=${appName}&app_version=${appVersion}&platform=${platform}&environment=${environment}&app_language=${app_language}`,
+      `${appUpgradeBaseUrl}/api/v1/versions/check?app_name=${appName}&app_version=${appVersion}&platform=${platform}&environment=${environment}&app_language=${appLanguage}`,
       {
         headers: {
           "x-api-key": xApiKey,