diff --git a/composer.json b/composer.json
index cea0032..fabbb6a 100644
--- a/composer.json
+++ b/composer.json
@@ -9,8 +9,7 @@
         "symfony/console": "~2.1",
         "symfony/finder": "~2.1",
         "symfony/process": "~2.1",
-        "knplabs/packagist-api": "~1.0",
-        "clue/zenity-react": "0.1.*"
+        "knplabs/packagist-api": "~1.0"
     },
     "autoload": {
         "psr-0": {"Clue": "src/"}
diff --git a/composer.lock b/composer.lock
index 1d48efe..47c50df 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,47 +1,11 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file"
+        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "This file is @generated automatically"
     ],
-    "hash": "577b5b0cf95fa67ae653ff1eceeeed0a",
+    "hash": "0b471ef368c3cd2f99d8052c5a93e3ad",
     "packages": [
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-            "name": "clue/zenity-react",
-            "version": "v0.1.1",
-            "source": {
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-                "url": "https://github.com/clue/zenity-react.git",
-                "reference": "6ca20be6f6c4701aa6b0dbc1559361839efecf44"
-            },
-            "dist": {
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-                "url": "https://api.github.com/repos/clue/zenity-react/zipball/6ca20be6f6c4701aa6b0dbc1559361839efecf44",
-                "reference": "6ca20be6f6c4701aa6b0dbc1559361839efecf44",
-                "shasum": ""
-            },
-            "require": {
-                "icecave/mephisto": "0.1.*",
-                "react/promise": "~1"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-0": {
-                    "Clue\\Zenity\\React": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Christian Lück",
-                    "email": "christian@lueck.tv"
-                }
-            ],
-            "description": "Async Zenity",
-            "time": "2014-01-24 13:35:59"
-        },
         {
             "name": "doctrine/inflector",
             "version": "v1.0",
@@ -106,93 +70,6 @@
             ],
             "time": "2013-01-10 21:49:15"
         },
-        {
-            "name": "eloquent/enumeration",
-            "version": "3.0.2",
-            "source": {
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-                "url": "https://github.com/eloquent/enumeration.git",
-                "reference": "ee87a3062d71a00cb61167f2d59dd479a129caf6"
-            },
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-                "url": "https://api.github.com/repos/eloquent/enumeration/zipball/ee87a3062d71a00cb61167f2d59dd479a129caf6",
-                "reference": "ee87a3062d71a00cb61167f2d59dd479a129caf6",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.0"
-            },
-            "require-dev": {
-                "icecave/archer": "~0.2"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-0": {
-                    "Eloquent\\Enumeration": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Erin Millard",
-                    "email": "ezzatron@gmail.com",
-                    "homepage": "http://ezzatron.com/"
-                }
-            ],
-            "description": "An enumeration implementation for PHP.",
-            "homepage": "https://github.com/eloquent/enumeration",
-            "keywords": [
-                "class",
-                "enum",
-                "enumeration",
-                "set"
-            ],
-            "time": "2013-03-04 09:52:52"
-        },
-        {
-            "name": "evenement/evenement",
-            "version": "v1.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/igorw/evenement.git",
-                "reference": "fa966683e7df3e5dd5929d984a44abfbd6bafe8d"
-            },
-            "dist": {
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-                "url": "https://api.github.com/repos/igorw/evenement/zipball/fa966683e7df3e5dd5929d984a44abfbd6bafe8d",
-                "reference": "fa966683e7df3e5dd5929d984a44abfbd6bafe8d",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.0"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-0": {
-                    "Evenement": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Igor Wiedler",
-                    "email": "igor@wiedler.ch",
-                    "homepage": "http://wiedler.ch/igor/"
-                }
-            ],
-            "description": "Événement is a very simple event dispatching library for PHP 5.3",
-            "keywords": [
-                "event-dispatcher"
-            ],
-            "time": "2012-05-30 15:01:08"
-        },
         {
             "name": "guzzle/common",
             "version": "v3.8.0",
@@ -450,229 +327,6 @@
             ],
             "time": "2013-11-09 17:22:29"
         },
-        {
-            "name": "icecave/collections",
-            "version": "0.6.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/IcecaveStudios/collections.git",
-                "reference": "b36f5d1d148ba772753feaae1cee252c706d718c"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/IcecaveStudios/collections/zipball/b36f5d1d148ba772753feaae1cee252c706d718c",
-                "reference": "b36f5d1d148ba772753feaae1cee252c706d718c",
-                "shasum": ""
-            },
-            "require": {
-                "icecave/repr": "~1",
-                "php": ">=5.3.3"
-            },
-            "require-dev": {
-                "eloquent/liberator": "~1",
-                "eloquent/typhoon": "~0.9",
-                "icecave/archer": "~0.2"
-            },
-            "type": "library",
-            "extra": {
-                "typhoon": {
-                    "output-path": "lib-typhoon",
-                    "validator-namespace": "Icecave\\Collections\\TypeCheck",
-                    "use-native-callable": false
-                }
-            },
-            "autoload": {
-                "psr-0": {
-                    "Icecave\\Collections": "lib",
-                    "Icecave\\Collections\\TypeCheck": "lib-typhoon"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "James Harris",
-                    "email": "james.harris@icecave.com.au",
-                    "homepage": "https://github.com/jmalloc"
-                }
-            ],
-            "description": "A set of PHP collection types loosely inspired by the .NET runtime and the C++ STL.",
-            "homepage": "https://github.com/IcecaveStudios/collections",
-            "keywords": [
-                "array",
-                "collection",
-                "container",
-                "hash",
-                "map",
-                "queue",
-                "sequence",
-                "stack"
-            ],
-            "time": "2013-02-26 04:19:11"
-        },
-        {
-            "name": "icecave/isolator",
-            "version": "2.2.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/IcecaveStudios/isolator.git",
-                "reference": "2f3fbfcee90790fb3ddde9d4288a2a927cdf6dd6"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/IcecaveStudios/isolator/zipball/2f3fbfcee90790fb3ddde9d4288a2a927cdf6dd6",
-                "reference": "2f3fbfcee90790fb3ddde9d4288a2a927cdf6dd6",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3"
-            },
-            "require-dev": {
-                "icecave/archer": "~0.4"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-0": {
-                    "Icecave\\Isolator": "lib"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
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-                    "name": "James Harris",
-                    "email": "james.harris@icecave.com.au",
-                    "homepage": "https://github.com/jmalloc"
-                }
-            ],
-            "description": "Isolate PHP tests from the global environment.",
-            "homepage": "https://github.com/IcecaveStudios/isolator",
-            "keywords": [
-                "fake",
-                "mock",
-                "phake",
-                "phpunit",
-                "test",
-                "unit"
-            ],
-            "time": "2013-06-04 05:00:29"
-        },
-        {
-            "name": "icecave/mephisto",
-            "version": "0.1.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/IcecaveStudios/mephisto.git",
-                "reference": "737eaae1a42d6e36bee72a41e1ab2981b7a60863"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/IcecaveStudios/mephisto/zipball/737eaae1a42d6e36bee72a41e1ab2981b7a60863",
-                "reference": "737eaae1a42d6e36bee72a41e1ab2981b7a60863",
-                "shasum": ""
-            },
-            "require": {
-                "eloquent/enumeration": "~3",
-                "ext-pcntl": "*",
-                "ext-posix": "*",
-                "icecave/collections": "0.6.*",
-                "icecave/isolator": "~2.2",
-                "php": ">=5.3",
-                "react/event-loop": "0.3.*",
-                "react/stream": "0.3.*"
-            },
-            "require-dev": {
-                "eloquent/liberator": "~1",
-                "eloquent/typhoon": "0.9.*",
-                "icecave/archer": "1.0.0-alpha.2"
-            },
-            "type": "library",
-            "extra": {
-                "typhoon": {
-                    "output-path": "lib-typhoon",
-                    "validator-namespace": "Icecave\\Mephisto\\TypeCheck",
-                    "use-native-callable": false
-                }
-            },
-            "autoload": {
-                "psr-0": {
-                    "Icecave\\Mephisto": "lib",
-                    "Icecave\\Mephisto\\TypeCheck": "lib-typhoon"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "James Harris",
-                    "email": "james.harris@icecave.com.au",
-                    "homepage": "https://github.com/jmalloc"
-                }
-            ],
-            "description": "An asynchronous process management library for ReactPHP.",
-            "homepage": "https://github.com/IcecaveStudios/mephisto",
-            "keywords": [
-                "background",
-                "daemon",
-                "fork",
-                "process",
-                "react",
-                "server"
-            ],
-            "time": "2013-09-06 00:17:36"
-        },
-        {
-            "name": "icecave/repr",
-            "version": "1.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/IcecaveStudios/repr.git",
-                "reference": "9a78b2b12dbb6fbf46d995f7255ee1f1118bfd8b"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/IcecaveStudios/repr/zipball/9a78b2b12dbb6fbf46d995f7255ee1f1118bfd8b",
-                "reference": "9a78b2b12dbb6fbf46d995f7255ee1f1118bfd8b",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.0"
-            },
-            "require-dev": {
-                "phake/phake": "1.*"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-0": {
-                    "Icecave\\Repr": "lib"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "James Harris",
-                    "email": "james.harris@icecave.com.au",
-                    "homepage": "https://github.com/jmalloc"
-                }
-            ],
-            "description": "Human readable string representations of everything.",
-            "homepage": "https://github.com/IcecaveStudios/repr",
-            "keywords": [
-                "repr",
-                "representation",
-                "string"
-            ],
-            "time": "2013-01-11 00:04:43"
-        },
         {
             "name": "knplabs/packagist-api",
             "version": "v1.1",
@@ -827,137 +481,6 @@
             ],
             "time": "2013-10-15 22:58:04"
         },
-        {
-            "name": "react/event-loop",
-            "version": "v0.3.3",
-            "target-dir": "React/EventLoop",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/reactphp/event-loop.git",
-                "reference": "49208fa3a15c9eae4adf8351ee9caa4064fe550d"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/reactphp/event-loop/zipball/49208fa3a15c9eae4adf8351ee9caa4064fe550d",
-                "reference": "49208fa3a15c9eae4adf8351ee9caa4064fe550d",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.3"
-            },
-            "suggest": {
-                "ext-libev": "*",
-                "ext-libevent": ">=0.0.5"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "0.3-dev"
-                }
-            },
-            "autoload": {
-                "psr-0": {
-                    "React\\EventLoop": ""
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "description": "Event loop abstraction layer that libraries can use for evented I/O.",
-            "keywords": [
-                "event-loop"
-            ],
-            "time": "2013-07-08 22:38:22"
-        },
-        {
-            "name": "react/promise",
-            "version": "v1.0.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/reactphp/promise.git",
-                "reference": "d6de8cae1dbb4878d909c41cb89aff764504472c"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/reactphp/promise/zipball/d6de8cae1dbb4878d909c41cb89aff764504472c",
-                "reference": "d6de8cae1dbb4878d909c41cb89aff764504472c",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.3"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0-dev"
-                }
-            },
-            "autoload": {
-                "psr-0": {
-                    "React\\Promise": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Jan Sorgalla",
-                    "email": "jsorgalla@googlemail.com",
-                    "homepage": "http://sorgalla.com",
-                    "role": "maintainer"
-                }
-            ],
-            "description": "A lightweight implementation of CommonJS Promises/A for PHP",
-            "time": "2013-04-03 14:05:55"
-        },
-        {
-            "name": "react/stream",
-            "version": "v0.3.3",
-            "target-dir": "React/Stream",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/reactphp/stream.git",
-                "reference": "b72900ab00513b591fb101faecad38f9c8eab8da"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/reactphp/stream/zipball/b72900ab00513b591fb101faecad38f9c8eab8da",
-                "reference": "b72900ab00513b591fb101faecad38f9c8eab8da",
-                "shasum": ""
-            },
-            "require": {
-                "evenement/evenement": "1.0.*",
-                "php": ">=5.3.3"
-            },
-            "suggest": {
-                "react/event-loop": "0.3.*",
-                "react/promise": "~1.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "0.3-dev"
-                }
-            },
-            "autoload": {
-                "psr-0": {
-                    "React\\Stream": ""
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "description": "Basic readable and writable stream interfaces that support piping.",
-            "keywords": [
-                "pipe",
-                "stream"
-            ],
-            "time": "2013-07-09 00:44:12"
-        },
         {
             "name": "symfony/console",
             "version": "v2.4.1",
diff --git a/src/Clue/PharComposer/App.php b/src/Clue/PharComposer/App.php
index ae16789..4e80879 100644
--- a/src/Clue/PharComposer/App.php
+++ b/src/Clue/PharComposer/App.php
@@ -16,7 +16,9 @@ public function __construct()
         $this->add(new Command\Build());
         $this->add(new Command\Search());
         $this->add(new Command\Install());
-        $this->add(new Command\Gui());
+
+        // GUI feature disabled for now, see #35
+        // $this->add(new Command\Gui());
     }
 
     /**
@@ -37,7 +39,7 @@ protected function getCommandName(InputInterface $input)
 
     private function getDefaultCommandName()
     {
-        $gui = $this->get('gui');
+        $gui = $this->has('gui') ? $this->get('gui') : null;
         if ($gui instanceof Command\Gui && $gui->hasZenity()) {
             return 'gui';
         }