diff --git a/src/browser/components/MattermostView.jsx b/src/browser/components/MattermostView.jsx
index 59243a6d..23eb558f 100644
--- a/src/browser/components/MattermostView.jsx
+++ b/src/browser/components/MattermostView.jsx
@@ -93,11 +93,7 @@ const MattermostView = React.createClass({
           });
         }
 
-        osLocale((err, locale) => {
-          if (err) {
-            console.log(err);
-            return;
-          }
+        osLocale().then((locale) => {
           if (locale === 'ja_JP') {
             applyCssFile(__dirname + '/css/jp_fonts.css');
           }
diff --git a/src/package.json b/src/package.json
index fb172e65..7ce051b6 100644
--- a/src/package.json
+++ b/src/package.json
@@ -17,13 +17,13 @@
   "dependencies": {
     "auto-launch": "^5.0.1",
     "bootstrap": "^3.3.7",
-    "electron-context-menu": "^0.6.0",
+    "electron-context-menu": "^0.8.0",
     "electron-squirrel-startup": "^1.0.0",
-    "os-locale": "^1.4.0",
-    "react": "^15.3.0",
-    "react-addons-css-transition-group": "^15.3.0",
-    "react-bootstrap": "~0.30.6",
-    "react-dom": "^15.3.0",
+    "os-locale": "^2.0.0",
+    "react": "^15.4.1",
+    "react-addons-css-transition-group": "^15.4.1",
+    "react-bootstrap": "~0.30.7",
+    "react-dom": "^15.4.1",
     "yargs": "^3.32.0"
   }
 }