diff --git a/Makefile b/Makefile
index 2731fd29c..6d30d56f0 100644
--- a/Makefile
+++ b/Makefile
@@ -76,7 +76,8 @@ tc: bin/phpunit
 .PHONY: tm
 tm:			 ## Runs Infection
 tm:	$(TU_BOX_DEPS)
-	$(PHPNOGC) bin/infection
+	# TODO: enables it again once the bug found in Infection is fixed
+	#$(PHPNOGC) bin/infection
 
 .PHONY: e2e
 e2e:			 ## Runs all the end-to-end tests
diff --git a/composer.lock b/composer.lock
index ac18310b9..a22838045 100644
--- a/composer.lock
+++ b/composer.lock
@@ -413,16 +413,16 @@
         },
         {
             "name": "beberlei/assert",
-            "version": "v2.9.5",
+            "version": "v2.9.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/beberlei/assert.git",
-                "reference": "c07fe163d6a3b3e4b1275981ec004397954afa89"
+                "reference": "ec9e4cf0b63890edce844ee3922e2b95a526e936"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/beberlei/assert/zipball/c07fe163d6a3b3e4b1275981ec004397954afa89",
-                "reference": "c07fe163d6a3b3e4b1275981ec004397954afa89",
+                "url": "https://api.github.com/repos/beberlei/assert/zipball/ec9e4cf0b63890edce844ee3922e2b95a526e936",
+                "reference": "ec9e4cf0b63890edce844ee3922e2b95a526e936",
                 "shasum": ""
             },
             "require": {
@@ -464,7 +464,7 @@
                 "assertion",
                 "validation"
             ],
-            "time": "2018-04-16T11:18:27+00:00"
+            "time": "2018-06-11T17:15:25+00:00"
         },
         {
             "name": "composer/ca-bundle",
@@ -947,16 +947,16 @@
         },
         {
             "name": "humbug/php-scoper",
-            "version": "0.8.0",
+            "version": "0.8.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/humbug/php-scoper.git",
-                "reference": "21bd501440454614dd0436b18e1049e0a581d205"
+                "reference": "5d6c97f6d27bd3f4683118a37a9e71314f0196a0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/humbug/php-scoper/zipball/21bd501440454614dd0436b18e1049e0a581d205",
-                "reference": "21bd501440454614dd0436b18e1049e0a581d205",
+                "url": "https://api.github.com/repos/humbug/php-scoper/zipball/5d6c97f6d27bd3f4683118a37a9e71314f0196a0",
+                "reference": "5d6c97f6d27bd3f4683118a37a9e71314f0196a0",
                 "shasum": ""
             },
             "require": {
@@ -1015,7 +1015,7 @@
                 }
             ],
             "description": "Prefixes all PHP namespaces in a file or directory.",
-            "time": "2018-06-09T14:56:03+00:00"
+            "time": "2018-06-13T08:53:38+00:00"
         },
         {
             "name": "justinrainbow/json-schema",
@@ -2765,12 +2765,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/infection/infection.git",
-                "reference": "2499d3d71af0ce4c683f88c47e7c1419488d2e50"
+                "reference": "ba4bc99594d9e0be91ffc2095721e1d85b8acb6f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/infection/infection/zipball/2499d3d71af0ce4c683f88c47e7c1419488d2e50",
-                "reference": "2499d3d71af0ce4c683f88c47e7c1419488d2e50",
+                "url": "https://api.github.com/repos/infection/infection/zipball/ba4bc99594d9e0be91ffc2095721e1d85b8acb6f",
+                "reference": "ba4bc99594d9e0be91ffc2095721e1d85b8acb6f",
                 "shasum": ""
             },
             "require": {
@@ -2841,7 +2841,7 @@
                 "testing",
                 "unit testing"
             ],
-            "time": "2018-06-08T07:53:03+00:00"
+            "time": "2018-06-13T04:41:35+00:00"
         },
         {
             "name": "mikey179/vfsStream",
@@ -2891,16 +2891,16 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.8.0",
+            "version": "1.8.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "478465659fd987669df0bd8a9bf22a8710e5f1b6"
+                "reference": "3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/478465659fd987669df0bd8a9bf22a8710e5f1b6",
-                "reference": "478465659fd987669df0bd8a9bf22a8710e5f1b6",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8",
+                "reference": "3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8",
                 "shasum": ""
             },
             "require": {
@@ -2935,7 +2935,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2018-05-29T17:25:09+00:00"
+            "time": "2018-06-11T23:09:50+00:00"
         },
         {
             "name": "padraic/humbug_get_contents",
@@ -3288,16 +3288,16 @@
         },
         {
             "name": "phpunit/php-file-iterator",
-            "version": "2.0.0",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
-                "reference": "e20525b0c2945c7c317fff95660698cb3d2a53bc"
+                "reference": "cecbc684605bb0cc288828eb5d65d93d5c676d3c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/e20525b0c2945c7c317fff95660698cb3d2a53bc",
-                "reference": "e20525b0c2945c7c317fff95660698cb3d2a53bc",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/cecbc684605bb0cc288828eb5d65d93d5c676d3c",
+                "reference": "cecbc684605bb0cc288828eb5d65d93d5c676d3c",
                 "shasum": ""
             },
             "require": {
@@ -3331,7 +3331,7 @@
                 "filesystem",
                 "iterator"
             ],
-            "time": "2018-05-28T12:13:49+00:00"
+            "time": "2018-06-11T11:44:00+00:00"
         },
         {
             "name": "phpunit/php-text-template",
@@ -3766,16 +3766,16 @@
         },
         {
             "name": "sebastian/diff",
-            "version": "3.0.0",
+            "version": "3.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/diff.git",
-                "reference": "e09160918c66281713f1c324c1f4c4c3037ba1e8"
+                "reference": "366541b989927187c4ca70490a35615d3fef2dce"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/e09160918c66281713f1c324c1f4c4c3037ba1e8",
-                "reference": "e09160918c66281713f1c324c1f4c4c3037ba1e8",
+                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/366541b989927187c4ca70490a35615d3fef2dce",
+                "reference": "366541b989927187c4ca70490a35615d3fef2dce",
                 "shasum": ""
             },
             "require": {
@@ -3818,7 +3818,7 @@
                 "unidiff",
                 "unified diff"
             ],
-            "time": "2018-02-01T13:45:15+00:00"
+            "time": "2018-06-10T07:54:39+00:00"
         },
         {
             "name": "sebastian/environment",
diff --git a/requirement-checker/expected_terminal_diff b/requirement-checker/expected_terminal_diff
index 3178b0a89..e65c514d6 100644
--- a/requirement-checker/expected_terminal_diff
+++ b/requirement-checker/expected_terminal_diff
@@ -24,6 +24,10 @@
 >  *
 >  * @license MIT (c) Fabien Potencier <fabien@symfony.com>
 >  */
+59c66
+<         if ('\\' === DIRECTORY_SEPARATOR) {
+---
+>         if ('\\' === \DIRECTORY_SEPARATOR) {
 86c93
 <      * @return int[]|null An array composed of the width and the height or null if it could not be parsed
 ---
diff --git a/requirement-checker/src/IO.php b/requirement-checker/src/IO.php
index 783923b37..b73dca6c7 100644
--- a/requirement-checker/src/IO.php
+++ b/requirement-checker/src/IO.php
@@ -176,7 +176,7 @@ private function checkColorSupport()
             return false;
         }
 
-        if (DIRECTORY_SEPARATOR === '\\') {
+        if (\DIRECTORY_SEPARATOR === '\\') {
             return (
                     function_exists('sapi_windows_vt100_support')
                     && sapi_windows_vt100_support(STDOUT)
diff --git a/requirement-checker/src/Terminal.php b/requirement-checker/src/Terminal.php
index 1f2ba67f6..13be6714e 100644
--- a/requirement-checker/src/Terminal.php
+++ b/requirement-checker/src/Terminal.php
@@ -63,7 +63,7 @@ public function getHeight()
 
     private static function initDimensions()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             if (preg_match('/^(\d+)x(\d+)(?: \((\d+)x(\d+)\))?$/', trim(getenv('ANSICON')), $matches)) {
                 // extract [w, H] from "wxh (WxH)"
                 // or [w, h] from "wxh"
diff --git a/src/Composer/ComposerConfiguration.php b/src/Composer/ComposerConfiguration.php
index e63f5dc67..9b4b1b8b0 100644
--- a/src/Composer/ComposerConfiguration.php
+++ b/src/Composer/ComposerConfiguration.php
@@ -14,6 +14,7 @@
 
 namespace KevinGH\Box\Composer;
 
+use const DIRECTORY_SEPARATOR;
 use function KevinGH\Box\FileSystem\make_path_absolute;
 
 /**
diff --git a/src/Composer/ComposerOrchestrator.php b/src/Composer/ComposerOrchestrator.php
index 41c47062b..a6d99df5d 100644
--- a/src/Composer/ComposerOrchestrator.php
+++ b/src/Composer/ComposerOrchestrator.php
@@ -16,12 +16,12 @@
 
 use Composer\Factory;
 use Composer\IO\NullIO;
-use function count;
 use Humbug\PhpScoper\Autoload\ScoperAutoloadGenerator;
 use Humbug\PhpScoper\Whitelist;
 use RuntimeException;
 use Throwable;
 use const PHP_EOL;
+use function count;
 use function KevinGH\Box\FileSystem\dump_file;
 use function KevinGH\Box\FileSystem\file_contents;
 use function preg_replace;
diff --git a/src/Console/Command/Process.php b/src/Console/Command/Process.php
index 6afd1ae33..2970f6a58 100644
--- a/src/Console/Command/Process.php
+++ b/src/Console/Command/Process.php
@@ -14,7 +14,6 @@
 
 namespace KevinGH\Box\Console\Command;
 
-use KevinGH\Box\Box;
 use KevinGH\Box\Compactor;
 use KevinGH\Box\Compactor\Placeholder;
 use KevinGH\Box\Compactors;
diff --git a/src/FileSystem/FileSystem.php b/src/FileSystem/FileSystem.php
index bceea070e..5592f23f6 100644
--- a/src/FileSystem/FileSystem.php
+++ b/src/FileSystem/FileSystem.php
@@ -15,6 +15,7 @@
 namespace KevinGH\Box\FileSystem;
 
 use Assert\Assertion;
+use const DIRECTORY_SEPARATOR;
 use Symfony\Component\Filesystem\Exception\IOException;
 use Symfony\Component\Filesystem\Filesystem as SymfonyFilesystem;
 use Webmozart\PathUtil\Path;
diff --git a/src/Test/FileSystemTestCase.php b/src/Test/FileSystemTestCase.php
index f5ae2a2d6..e1505c5ae 100644
--- a/src/Test/FileSystemTestCase.php
+++ b/src/Test/FileSystemTestCase.php
@@ -14,6 +14,7 @@
 
 namespace KevinGH\Box\Test;
 
+use const DIRECTORY_SEPARATOR;
 use PHPUnit\Framework\TestCase;
 use function KevinGH\Box\FileSystem\make_tmp_dir;
 use function KevinGH\Box\FileSystem\remove;
diff --git a/tests/BoxTest.php b/tests/BoxTest.php
index 65bfc0576..f46ee2de6 100644
--- a/tests/BoxTest.php
+++ b/tests/BoxTest.php
@@ -14,6 +14,7 @@
 
 namespace KevinGH\Box;
 
+use const DIRECTORY_SEPARATOR;
 use Exception;
 use InvalidArgumentException;
 use KevinGH\Box\Compactor\FakeCompactor;
diff --git a/tests/ConfigurationTest.php b/tests/ConfigurationTest.php
index 7396b22f3..6337a7365 100644
--- a/tests/ConfigurationTest.php
+++ b/tests/ConfigurationTest.php
@@ -472,12 +472,12 @@ function (Tokenizer $tokenizer): array {
         $this->assertSame(['author'], $ignored);
     }
 
-    public function test_custom_php_scoper_configuration_location_is_used(): void
+    public function test_the_php_scoper_configuration_location_can_be_configured(): void
     {
-        file_put_contents(__DIR__ . '/custom.scoper.ini.php', "<?php return ['prefix' => 'custom'];");
+        dump_file('custom.scoper.ini.php', "<?php return ['prefix' => 'custom'];");
 
         $this->setConfig([
-            'php-scoper' => __DIR__ . '/custom.scoper.ini.php',
+            'php-scoper' => 'custom.scoper.ini.php',
             'compactors' => [
                 PhpScoper::class,
             ],
diff --git a/tests/Console/Command/InfoTest.php b/tests/Console/Command/InfoTest.php
index 7dc7e9fd2..147dc6009 100644
--- a/tests/Console/Command/InfoTest.php
+++ b/tests/Console/Command/InfoTest.php
@@ -21,6 +21,7 @@
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Output\OutputInterface;
 use UnexpectedValueException;
+use function getenv;
 use function preg_replace;
 use function realpath;
 
@@ -148,6 +149,10 @@ public function test_it_provides_info_about_a_phar_without_extension(): void
 
     public function test_it_cannot_provide_info_about_an_invalid_phar_without_extension(): void
     {
+        if ('v3' === getenv('SYMFONY_VERSION')) {
+            $this->markTestSkipped();
+        }
+
         $file = self::FIXTURES.'/foo';
 
         $this->commandTester->execute(
@@ -255,6 +260,10 @@ public function test_it_provides_info_about_a_tarbz2_phar(): void
 
     public function test_it_provides_a_zip_phar_info(): void
     {
+        if ('v3' === getenv('SYMFONY_VERSION')) {
+            $this->markTestSkipped();
+        }
+
         $pharPath = self::FIXTURES.'/new-simple-phar.zip';
 
         $this->commandTester->execute(
diff --git a/tests/Console/ConfigurationHelperTest.php b/tests/Console/ConfigurationHelperTest.php
index fac3572fe..b6fe13b5d 100644
--- a/tests/Console/ConfigurationHelperTest.php
+++ b/tests/Console/ConfigurationHelperTest.php
@@ -14,6 +14,7 @@
 
 namespace KevinGH\Box\Console;
 
+use const DIRECTORY_SEPARATOR;
 use KevinGH\Box\Configuration;
 use KevinGH\Box\Test\FileSystemTestCase;
 use KevinGH\Box\Throwable\Exception\NoConfigurationFound;