diff --git a/composer.json b/composer.json
index 8af3eb8..ded0e88 100644
--- a/composer.json
+++ b/composer.json
@@ -21,10 +21,11 @@
         }
     ],
     "require": {
-        "php": "^7.3||^8.0",
+        "php": "^7.4||^8.0",
         "ext-json": "*",
         "guzzlehttp/guzzle": "~6||~7",
         "illuminate/support": "~6||~7||~8",
+        "laravel/framework": "~6||~7||~8",
         "illuminate/http": "~6||~7||~8",
         "symfony/http-foundation": "^4.4.7 || ^5.1",
         "symfony/psr-http-message-bridge": "^1.0 || ^2.0"
diff --git a/src/Authentication.php b/src/Authentication.php
index 606d314..c6aed96 100644
--- a/src/Authentication.php
+++ b/src/Authentication.php
@@ -93,7 +93,7 @@ private function requestNewToken()
      */
     private function cache($accessToken, $expiry)
     {
-        $minutes = ($expiry / 60);
+        $minutes = (int) ($expiry / 60);
         Cache::store('file')->put($this->cacheKey, $accessToken, now()->addMinutes($minutes));
 
         return Cache::store('file')->get($this->cacheKey);
diff --git a/src/Controllers/HumanResourcesEmployeeController.php b/src/Controllers/HumanResourcesEmployeeController.php
index e1cb78d..035cfda 100644
--- a/src/Controllers/HumanResourcesEmployeeController.php
+++ b/src/Controllers/HumanResourcesEmployeeController.php
@@ -12,6 +12,7 @@
 use spkm\isams\Endpoint;
 use spkm\isams\Wrappers\Employee;
 use spkm\isams\Wrappers\EmployeePhoto;
+use Exception;
 
 class HumanResourcesEmployeeController extends Endpoint
 {
@@ -129,10 +130,10 @@ public function show(int $id): Employee
     public function getCurrentPhoto(int $id, int $quality = 75): EmployeePhoto
     {
         /**
-         * At the moment this package doesn't auto-include Intervention, so we need to check for its existance first.
+         * At the moment this package doesn't auto-include Intervention, so we need to check for its existence first.
          */
         if (! method_exists(ImageManagerStatic::class, 'make')) {
-            throw new \Exception('This method requires Intervention/Image package.', 500);
+            throw new Exception('This method requires Intervention/Image package.', 500);
         }
 
         try {
diff --git a/src/Controllers/StorageFileController.php b/src/Controllers/StorageFileController.php
index a70bacd..dd9070e 100644
--- a/src/Controllers/StorageFileController.php
+++ b/src/Controllers/StorageFileController.php
@@ -24,7 +24,7 @@ protected function setEndpoint()
      *
      * @param string $path
      * @param string $name
-     * @return binary|string
+     * @return mixed
      * @throws \GuzzleHttp\Exception\GuzzleException
      */
     public function show(string $path, string $name)
@@ -42,7 +42,7 @@ public function show(string $path, string $name)
      * @author Fred Bradley <frb@cranleigh.org>
      * @param string $path
      * @param string $name
-     * @return binary|string
+     * @return mixed
      * @throws \GuzzleHttp\Exception\GuzzleException
      */
     public function download(string $path, string $name)
diff --git a/src/Endpoint.php b/src/Endpoint.php
index 72dc7af..bff823e 100644
--- a/src/Endpoint.php
+++ b/src/Endpoint.php
@@ -40,7 +40,7 @@ abstract protected function setEndpoint();
     /**
      * Get the School to be queried.
      *
-     * @return \spkm\Isams\Contracts\Institution
+     * @return \spkm\isams\Contracts\Institution
      */
     protected function getInstitution()
     {
diff --git a/src/Wrappers/TeachingSubject.php b/src/Wrappers/TeachingSubject.php
index 7413481..6d3ebd4 100644
--- a/src/Wrappers/TeachingSubject.php
+++ b/src/Wrappers/TeachingSubject.php
@@ -9,6 +9,7 @@
  */
 class TeachingSubject extends Wrapper
 {
+    protected bool $isHidden;
     /**
      * Handle the data.
      *