diff --git a/source/Ox/js/String.js b/source/Ox/js/String.js
index 7dd1e004..35306b3c 100644
--- a/source/Ox/js/String.js
+++ b/source/Ox/js/String.js
@@ -325,7 +325,7 @@ Ox.parseUserAgent = function(userAgent) {
                 /(Linux).+(CentOS|CrOS|Debian|Fedora|Gentoo|Mandriva|MeeGo|Mint|Red Hat|SUSE|Ubuntu|webOS)/,
                 /(CentOS|CrOS|Debian|Fedora|Gentoo|Mandriva|MeeGo|Mint|Red Hat|SUSE|Ubuntu|webOS).+(Linux)/,
                 /(Linux)/,
-                /(Mac OS X) (10.\d)/,
+                /(Mac OS X) (10.\d+)/,
                 /(Mac OS X)/,
                 /(Macintosh)/,
                 /(SymbianOS)\/(\d+)/,
@@ -352,6 +352,8 @@ Ox.parseUserAgent = function(userAgent) {
                 '10.6': '10.6 (Snow Leopard)',
                 '10.7': '10.7 (Lion)',
                 '10.8': '10.8 (Mountain Lion)',
+                '10.9': '10.9 (Mavericks)',
+                '10.10': '10.10 (Yosemite)',
                 'CrOS': 'Chrome OS',
                 'NT 4.0': 'NT 4.0 (Windows NT)',
                 'NT 4.1': 'NT 4.1 (Windows 98)',