diff --git a/lib/virtualenv.js b/lib/virtualenv.js
index 29350dc..6b48d55 100644
--- a/lib/virtualenv.js
+++ b/lib/virtualenv.js
@@ -146,8 +146,14 @@ VirtualEnv.prototype._find = function _find(callback) {
 
     // Find the latest valid version.
     var latestValidVersion;
-    versions.sort(function(a, b) {
-      return semver.lt(a, b);
+    versions.map(function(version) {
+        return semver.coerce(version);
+    }).filter(function(version) {
+        return version;
+    }).map(function(version) {
+        return version.raw;
+    }).sort(function(a, b) {
+        return semver.lt(a, b);
     }).some(function(version) {
       if (semver.satisfies(version, targetVersion)) {
         latestValidVersion = version;
@@ -177,8 +183,7 @@ VirtualEnv.prototype._find = function _find(callback) {
   // Propagate pypi error callback.
   }, function(err) {
     callback(new Error("unable to retrieve version information for virtualenv"));
-  });
-
+  }, true);
 }
 
 VirtualEnv.prototype._download = function _download(url, callback) {
diff --git a/package.json b/package.json
index f3ea288..810d0b3 100644
--- a/package.json
+++ b/package.json
@@ -1,45 +1,34 @@
 {
-
   "name": "virtualenv",
   "version": "0.3.1",
   "description": "install and use Python dependencies in node with virtualenv",
-
   "keywords": [
     "python",
     "virtualenv",
     "rpc"
   ],
-
   "repository": {
-      "type": "git",
-      "url": "https://github.com/mjpizz/node-virtualenv.git"
+    "type": "git",
+    "url": "https://github.com/mjpizz/node-virtualenv.git"
   },
-
   "main": "./lib/virtualenv.js",
   "engines": {
-      "node": ">=0.6"
+    "node": ">=0.6"
   },
-
   "dependencies": {
-
     "request": "2.x",
-    "rimraf": "2.x",
-    "glob": "3.x",
+    "rimraf": "3.x",
+    "glob": "7.x",
     "tar": "2.x",
     "semver": "5.x",
-    "xmlrpc": "0.8.x"
-
+    "xmlrpc": "1.3.x"
   },
-
   "bin": {
     "virtualenv-postinstall": "./bin/postinstall"
   },
-
   "license": "MIT",
-
   "author": {
     "name": "Matt Pizzimenti",
     "url": "http://mjpizz.com"
   }
-
 }