diff --git a/composer.json b/composer.json
index f1852669..76cf46f9 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,6 @@
         "php": "^7.1",
         "nikic/php-parser": "^3.0",
         "ocramius/package-versions": "^1.1",
-        "padraic/phar-updater": "^1.0",
         "roave/better-reflection": "^2.0",
         "symfony/console": "^3.2 || ^4.0",
         "symfony/filesystem": "^3.2 || ^4.0",
diff --git a/composer.lock b/composer.lock
index 4f64b538..b9c90c18 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,10 +1,10 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "229cecb000496023ebe7f7454d1452fd",
+    "content-hash": "1b72b0b26957bca6e70c5c255bb842a8",
     "packages": [
         {
             "name": "nikic/php-parser",
@@ -106,115 +106,6 @@
             "description": "Composer plugin that provides efficient querying for installed package versions (no runtime IO)",
             "time": "2017-09-06T15:24:43+00:00"
         },
-        {
-            "name": "padraic/humbug_get_contents",
-            "version": "1.0.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/humbug/file_get_contents.git",
-                "reference": "66797199019d0cb4529cb8d29c6f0b4c5085b53a"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/humbug/file_get_contents/zipball/66797199019d0cb4529cb8d29c6f0b4c5085b53a",
-                "reference": "66797199019d0cb4529cb8d29c6f0b4c5085b53a",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~4.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Humbug\\": "src/Humbug/"
-                },
-                "files": [
-                    "src/function.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Pádraic Brady",
-                    "email": "padraic.brady@gmail.com",
-                    "homepage": "http://blog.astrumfutura.com"
-                }
-            ],
-            "description": "Secure wrapper for accessing HTTPS resources with file_get_contents for PHP 5.3+",
-            "homepage": "https://github.com/padraic/file_get_contents",
-            "keywords": [
-                "download",
-                "file_get_contents",
-                "http",
-                "https",
-                "ssl",
-                "tls"
-            ],
-            "time": "2015-04-22T18:45:00+00:00"
-        },
-        {
-            "name": "padraic/phar-updater",
-            "version": "1.0.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/humbug/phar-updater.git",
-                "reference": "ac8802df2d1d03b7092b6f044a914f8d21592aae"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/humbug/phar-updater/zipball/ac8802df2d1d03b7092b6f044a914f8d21592aae",
-                "reference": "ac8802df2d1d03b7092b6f044a914f8d21592aae",
-                "shasum": ""
-            },
-            "require": {
-                "padraic/humbug_get_contents": "1.0.4",
-                "php": ">=5.3.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~4.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Humbug\\SelfUpdate\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Padraic Brady",
-                    "email": "padraic.brady@gmail.com",
-                    "homepage": "http://blog.astrumfutura.com"
-                }
-            ],
-            "description": "A thing to make PHAR self-updating easy and secure.",
-            "keywords": [
-                "humbug",
-                "phar",
-                "self-update",
-                "update"
-            ],
-            "time": "2017-07-12T22:42:45+00:00"
-        },
         {
             "name": "phpdocumentor/reflection-common",
             "version": "1.0.1",
diff --git a/src/functions.php b/src/functions.php
index fb6ab748..d5905da6 100644
--- a/src/functions.php
+++ b/src/functions.php
@@ -17,15 +17,12 @@
 use Humbug\PhpScoper\Console\Application;
 use Humbug\PhpScoper\Console\Command\AddPrefixCommand;
 use Humbug\PhpScoper\Console\Command\InitCommand;
-use Humbug\PhpScoper\Console\Command\SelfUpdateCommand;
 use Humbug\PhpScoper\PhpParser\TraverserFactory;
 use Humbug\PhpScoper\Scoper\Composer\InstalledPackagesScoper;
 use Humbug\PhpScoper\Scoper\Composer\JsonFileScoper;
 use Humbug\PhpScoper\Scoper\NullScoper;
 use Humbug\PhpScoper\Scoper\PatchScoper;
 use Humbug\PhpScoper\Scoper\PhpScoper;
-use Humbug\SelfUpdate\Exception\RuntimeException as SelfUpdateRuntimeException;
-use Humbug\SelfUpdate\Updater;
 use Iterator;
 use PackageVersions\Versions;
 use PhpParser\Node;
@@ -56,20 +53,6 @@ function create_application(): SymfonyApplication
         new InitCommand(),
     ]);
 
-    if ('phar:' === substr(__FILE__, 0, 5)) {
-        try {
-            $updater = new Updater();
-        } catch (SelfUpdateRuntimeException $e) {
-            /* Allow E2E testing of unsigned phar */
-            $updater = new Updater(null, false);
-        }
-        $app->add(
-            new SelfUpdateCommand(
-                $updater
-            )
-        );
-    }
-
     return $app;
 }