diff --git a/CHANGELOG.md b/CHANGELOG.md
index b744854..99a9c38 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,12 @@ See [GitHub releases](https://github.com/mll-lab/laravel-graphiql/releases).
 
 ## Unreleased
 
+## v2.0.3
+
+### Fixed
+
+- Fix PHP 7.1 compatibility
+
 ## v2.0.2
 
 ### Fixed
diff --git a/src/GraphiQLController.php b/src/GraphiQLController.php
index f6be0cc..596eb06 100755
--- a/src/GraphiQLController.php
+++ b/src/GraphiQLController.php
@@ -11,9 +11,11 @@
 
 class GraphiQLController
 {
-    protected UrlGenerator $urlGenerator;
+    /** @var \Illuminate\Contracts\Routing\UrlGenerator */
+    protected $urlGenerator;
 
-    protected ViewFactory $viewFactory;
+    /** @var \Illuminate\Contracts\View\Factory $ */
+    protected $viewFactory;
 
     public function __construct(UrlGenerator $urlGenerator, ViewFactory $viewFactory)
     {