diff --git a/README.md b/README.md
index 2678aa4..8eebbe6 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,13 @@ We had a similar challenge, specifically accessing a MySQL database over an SSH
 
 So we wrote this package. We hope you enjoy it!
 
+## Requirements
+This package has been tested against Laravel/Lumen versions 5.2. 5.3, and 5.4. 
+
+We do not support version <=5.1.
+
 ## Installation
+
 ```
 composer require stechstudio/laravel-ssh-tunnel
 ```
diff --git a/composer.json b/composer.json
index e914ae3..d4b49fc 100644
--- a/composer.json
+++ b/composer.json
@@ -26,5 +26,7 @@
         }
     ],
     "minimum-stability": "dev",
-    "require": {}
+    "require": {
+        "illuminate/support": "5.2.x|5.3.x|5.4.x"
+    }
 }
diff --git a/src/Jobs/CreateTunnel.php b/src/Jobs/CreateTunnel.php
index a396d10..d6aa6a9 100644
--- a/src/Jobs/CreateTunnel.php
+++ b/src/Jobs/CreateTunnel.php
@@ -73,7 +73,7 @@ protected function createTunnel()
      * Verifies whether the tunnel is active or not.
      * @return bool
      */
-    protected function verifyTunnel(): bool
+    protected function verifyTunnel()
     {
         return $this->runCommand($this->ncCommand);
     }
@@ -83,7 +83,7 @@ protected function verifyTunnel(): bool
      * @param $command
      * @return bool
      */
-    protected function runCommand($command): bool
+    protected function runCommand($command)
     {
         $return_var = 1;
         exec($command, $this->output, $return_var);