diff --git a/composer.json b/composer.json
index 62948a7f2ac2..8b27f4d4660b 100644
--- a/composer.json
+++ b/composer.json
@@ -40,7 +40,7 @@
         "symfony/routing": "^4.2",
         "symfony/var-dumper": "^4.2",
         "tijsverkoyen/css-to-inline-styles": "^2.2.1",
-        "vlucas/phpdotenv": "^3.0"
+        "vlucas/phpdotenv": "^3.3"
     },
     "replace": {
         "illuminate/auth": "self.version",
diff --git a/src/Illuminate/Foundation/Bootstrap/LoadEnvironmentVariables.php b/src/Illuminate/Foundation/Bootstrap/LoadEnvironmentVariables.php
index 7297bda94e56..672a18f0a7c5 100644
--- a/src/Illuminate/Foundation/Bootstrap/LoadEnvironmentVariables.php
+++ b/src/Illuminate/Foundation/Bootstrap/LoadEnvironmentVariables.php
@@ -3,9 +3,11 @@
 namespace Illuminate\Foundation\Bootstrap;
 
 use Dotenv\Dotenv;
+use Dotenv\Environment\DotenvFactory;
 use Dotenv\Exception\InvalidFileException;
 use Symfony\Component\Console\Input\ArgvInput;
 use Illuminate\Contracts\Foundation\Application;
+use Dotenv\Environment\Adapter\ServerConstAdapter;
 use Symfony\Component\Console\Output\ConsoleOutput;
 
 class LoadEnvironmentVariables
@@ -25,7 +27,7 @@ public function bootstrap(Application $app)
         $this->checkForSpecificEnvironmentFile($app);
 
         try {
-            Dotenv::create($app->environmentPath(), $app->environmentFile())->safeLoad();
+            $this->createDotenv($app)->safeLoad();
         } catch (InvalidFileException $e) {
             $this->writeErrorAndDie($e);
         }
@@ -74,6 +76,22 @@ protected function setEnvironmentFilePath($app, $file)
         return false;
     }
 
+    /**
+     * Create a Dotenv instance.
+     *
+     * @param  \Illuminate\Contracts\Foundation\Application  $app
+     *
+     * @return \Dotenv\Dotenv
+     */
+    protected function createDotenv($app)
+    {
+        return Dotenv::create(
+            $app->environmentPath(),
+            $app->environmentFile(),
+            new DotenvFactory([new ServerConstAdapter])
+        );
+    }
+
     /**
      * Write the error information to the screen and exit.
      *
diff --git a/src/Illuminate/Support/helpers.php b/src/Illuminate/Support/helpers.php
index 7bd92ec68cdb..3636ebfb1ee4 100755
--- a/src/Illuminate/Support/helpers.php
+++ b/src/Illuminate/Support/helpers.php
@@ -6,6 +6,7 @@
 use Illuminate\Support\Collection;
 use Illuminate\Contracts\Support\Htmlable;
 use Illuminate\Support\HigherOrderTapProxy;
+use Dotenv\Environment\Adapter\ServerConstAdapter;
 
 if (! function_exists('append_config')) {
     /**
@@ -635,32 +636,29 @@ function ends_with($haystack, $needles)
      */
     function env($key, $default = null)
     {
-        $value = getenv($key);
-
-        if ($value === false) {
-            return value($default);
-        }
-
-        switch (strtolower($value)) {
-            case 'true':
-            case '(true)':
-                return true;
-            case 'false':
-            case '(false)':
-                return false;
-            case 'empty':
-            case '(empty)':
-                return '';
-            case 'null':
-            case '(null)':
-                return;
-        }
-
-        if (($valueLength = strlen($value)) > 1 && $value[0] === '"' && $value[$valueLength - 1] === '"') {
-            return substr($value, 1, -1);
-        }
+        return (new ServerConstAdapter)
+            ->get($key)
+            ->map(function ($value) {
+                switch (strtolower($value)) {
+                    case 'true':
+                    case '(true)':
+                        return true;
+                    case 'false':
+                    case '(false)':
+                        return false;
+                    case 'empty':
+                    case '(empty)':
+                        return '';
+                    case 'null':
+                    case '(null)':
+                        return;
+                }
 
-        return $value;
+                return $value;
+            })
+            ->getOrCall(function () use ($default) {
+                return value($default);
+            });
     }
 }
 
diff --git a/tests/Support/SupportHelpersTest.php b/tests/Support/SupportHelpersTest.php
index 719efd8d5835..ee5cdbb51bdb 100755
--- a/tests/Support/SupportHelpersTest.php
+++ b/tests/Support/SupportHelpersTest.php
@@ -920,53 +920,47 @@ public function testWith()
 
     public function testEnv()
     {
-        putenv('foo=bar');
-        $this->assertEquals('bar', env('foo'));
-    }
-
-    public function testEnvWithQuotes()
-    {
-        putenv('foo="bar"');
-        $this->assertEquals('bar', env('foo'));
+        $_SERVER['foo'] = 'bar';
+        $this->assertSame('bar', env('foo'));
     }
 
     public function testEnvTrue()
     {
-        putenv('foo=true');
+        $_SERVER['foo'] = 'true';
         $this->assertTrue(env('foo'));
 
-        putenv('foo=(true)');
+        $_SERVER['foo'] = '(true)';
         $this->assertTrue(env('foo'));
     }
 
     public function testEnvFalse()
     {
-        putenv('foo=false');
+        $_SERVER['foo'] = 'false';
         $this->assertFalse(env('foo'));
 
-        putenv('foo=(false)');
+        $_SERVER['foo'] = '(false)';
         $this->assertFalse(env('foo'));
     }
 
     public function testEnvEmpty()
     {
-        putenv('foo=');
-        $this->assertEquals('', env('foo'));
+        $_SERVER['foo'] = '';
+        $this->assertSame('', env('foo'));
 
-        putenv('foo=empty');
-        $this->assertEquals('', env('foo'));
+        $_SERVER['foo'] = 'empty';
+        $this->assertSame('', env('foo'));
 
-        putenv('foo=(empty)');
-        $this->assertEquals('', env('foo'));
+        $_SERVER['foo'] = '(empty)';
+        $this->assertSame('', env('foo'));
     }
 
     public function testEnvNull()
     {
-        putenv('foo=null');
-        $this->assertEquals('', env('foo'));
+        $_SERVER['foo'] = 'null';
+        $this->assertNull(env('foo'));
 
-        putenv('foo=(null)');
-        $this->assertEquals('', env('foo'));
+        $_SERVER['foo'] = '(null)';
+        $this->assertNull(env('foo'));
     }
 }