diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a4a76f44..db26ce4c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -62,7 +62,7 @@ test:
     - cp -R tests/ phpunit.xml "${DOCROOT}"
     - HOMEDIR=$(pwd)
     - cd "${DOCROOT}"
-    - composer --no-ansi install --dev
+    - composer --no-ansi install
     - ./bin/migrate
   script:
     - vendor/bin/phpunit -v --colors=never --coverage-text --coverage-html "${HOMEDIR}/coverage/" --log-junit "${HOMEDIR}/unittests.xml"
diff --git a/composer.json b/composer.json
index dcfa3e82..3e50226a 100644
--- a/composer.json
+++ b/composer.json
@@ -22,27 +22,28 @@
         "ext-PDO": "*",
         "ext-SimpleXML": "*",
         "ext-xml": "*",
-        "doctrine/dbal": "^2.8",
-        "erusev/parsedown": "^1.6",
-        "illuminate/container": "5.5.*",
-        "illuminate/database": "5.5.*",
-        "illuminate/support": "5.5.*",
+        "doctrine/dbal": "^2.9",
+        "erusev/parsedown": "^1.7",
+        "illuminate/container": "5.8.*",
+        "illuminate/database": "5.8.*",
+        "illuminate/support": "5.8.*",
         "nikic/fast-route": "^1.3",
         "nyholm/psr7": "^1.1",
         "psr/container": "^1.0",
         "psr/http-server-middleware": "^1.0",
-        "psr/log": "^1.0",
-        "swiftmailer/swiftmailer": "^6.1",
-        "symfony/http-foundation": "^3.3",
-        "symfony/psr-http-message-bridge": "^1.0",
+        "psr/log": "^1.1",
+        "swiftmailer/swiftmailer": "^6.2",
+        "symfony/http-foundation": "^4.3",
+        "symfony/psr-http-message-bridge": "^1.2",
         "twig/extensions": "^1.5",
-        "twig/twig": "~2.6.0"
+        "twig/twig": "~2.6.0",
+        "vlucas/phpdotenv": "^3.3"
     },
     "require-dev": {
         "dms/phpunit-arraysubset-asserts": "^0.1.0",
-        "filp/whoops": "^2.1",
+        "filp/whoops": "^2.3",
         "phpunit/phpunit": "^8.1",
-        "symfony/var-dumper": "^3.3"
+        "symfony/var-dumper": "^4.3"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/Http/MessageTrait.php b/src/Http/MessageTrait.php
index 0b12ce61..93c7cd50 100644
--- a/src/Http/MessageTrait.php
+++ b/src/Http/MessageTrait.php
@@ -18,7 +18,7 @@ trait MessageTrait
      *
      * @return string HTTP protocol version.
      */
-    public function getProtocolVersion()
+    public function getProtocolVersion(): string
     {
         return parent::getProtocolVersion();
     }
diff --git a/src/Http/Request.php b/src/Http/Request.php
index 0e1acf76..0621d488 100644
--- a/src/Http/Request.php
+++ b/src/Http/Request.php
@@ -370,7 +370,6 @@ class Request extends SymfonyRequest implements ServerRequestInterface
                 $filename,
                 $file->getClientFilename(),
                 $file->getClientMediaType(),
-                $file->getSize(),
                 $file->getError()
             );
         }
diff --git a/tests/Unit/HelpersTest.php b/tests/Unit/HelpersTest.php
index 6d182907..ad677cb3 100644
--- a/tests/Unit/HelpersTest.php
+++ b/tests/Unit/HelpersTest.php
@@ -55,7 +55,7 @@ class HelpersTest extends TestCase
     }
 
     /**
-     * @covers \base_path()
+     * @covers \base_path
      */
     public function testBasePath()
     {
@@ -99,7 +99,7 @@ class HelpersTest extends TestCase
     }
 
     /**
-     * @covers \config_path()
+     * @covers \config_path
      */
     public function testConfigPath()
     {
@@ -117,20 +117,6 @@ class HelpersTest extends TestCase
         $this->assertEquals('/foo/conf/bar.php', config_path('bar.php'));
     }
 
-    /**
-     * @covers \env
-     */
-    public function testEnv()
-    {
-        putenv('envTestVar=someContent');
-
-        $env = env('envTestVar');
-        $this->assertEquals('someContent', $env);
-
-        $env = env('someRandomEnvVarThatShouldNeverExist', 'someDefaultValue');
-        $this->assertEquals('someDefaultValue', $env);
-    }
-
     /**
      * @covers \request
      */
diff --git a/tests/Unit/Http/RequestTest.php b/tests/Unit/Http/RequestTest.php
index 4d942311..3f52709d 100644
--- a/tests/Unit/Http/RequestTest.php
+++ b/tests/Unit/Http/RequestTest.php
@@ -286,7 +286,7 @@ class RequestTest extends TestCase
     {
         $filename = tempnam(sys_get_temp_dir(), 'test');
         file_put_contents($filename, 'LoremIpsum!');
-        $files = [new SymfonyFile($filename, 'foo.txt', 'text/plain', 11)];
+        $files = [new SymfonyFile($filename, 'foo.txt', 'text/plain', UPLOAD_ERR_PARTIAL)];
         $request = new Request([], [], [], [], $files);
 
         $uploadedFiles = $request->getUploadedFiles();
@@ -298,6 +298,7 @@ class RequestTest extends TestCase
         $this->assertEquals('foo.txt', $file->getClientFilename());
         $this->assertEquals('text/plain', $file->getClientMediaType());
         $this->assertEquals(11, $file->getSize());
+        $this->assertEquals(UPLOAD_ERR_PARTIAL, $file->getError());
     }
 
     /**