diff --git a/composer.lock b/composer.lock
index 45eb82a..6b89c43 100644
--- a/composer.lock
+++ b/composer.lock
@@ -281,16 +281,16 @@
         },
         {
             "name": "laravel/framework",
-            "version": "v5.7.8",
+            "version": "v5.7.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laravel/framework.git",
-                "reference": "763b64a43ebb6042e463aab4214d4cc9722147be"
+                "reference": "172f69f86bb86e107fb9fafff293b4b01291cf05"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laravel/framework/zipball/763b64a43ebb6042e463aab4214d4cc9722147be",
-                "reference": "763b64a43ebb6042e463aab4214d4cc9722147be",
+                "url": "https://api.github.com/repos/laravel/framework/zipball/172f69f86bb86e107fb9fafff293b4b01291cf05",
+                "reference": "172f69f86bb86e107fb9fafff293b4b01291cf05",
                 "shasum": ""
             },
             "require": {
@@ -419,7 +419,7 @@
                 "framework",
                 "laravel"
             ],
-            "time": "2018-10-04T14:47:20+00:00"
+            "time": "2018-10-09T13:28:28+00:00"
         },
         {
             "name": "league/flysystem",
@@ -2267,21 +2267,21 @@
         },
         {
             "name": "orchestra/testbench",
-            "version": "v3.7.2",
+            "version": "v3.7.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/orchestral/testbench.git",
-                "reference": "254f8f38dc777a914e3c27ee39c9f854db44a670"
+                "reference": "c569608fcecc9ee044f2485d58c1ac5fab26ee2f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/orchestral/testbench/zipball/254f8f38dc777a914e3c27ee39c9f854db44a670",
-                "reference": "254f8f38dc777a914e3c27ee39c9f854db44a670",
+                "url": "https://api.github.com/repos/orchestral/testbench/zipball/c569608fcecc9ee044f2485d58c1ac5fab26ee2f",
+                "reference": "c569608fcecc9ee044f2485d58c1ac5fab26ee2f",
                 "shasum": ""
             },
             "require": {
                 "laravel/framework": "~5.7.4",
-                "orchestra/testbench-core": "~3.7.3",
+                "orchestra/testbench-core": "~3.7.5",
                 "php": ">=7.1",
                 "phpunit/phpunit": "^7.0"
             },
@@ -2315,20 +2315,20 @@
                 "orchestral",
                 "testing"
             ],
-            "time": "2018-09-13T10:35:30+00:00"
+            "time": "2018-10-07T02:44:38+00:00"
         },
         {
             "name": "orchestra/testbench-core",
-            "version": "v3.7.4",
+            "version": "v3.7.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/orchestral/testbench-core.git",
-                "reference": "a8b9fc170115333240eb0f6507b456bbe09c1121"
+                "reference": "9ef7319cc288a613e38f456f0349907dfeb2587f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/orchestral/testbench-core/zipball/a8b9fc170115333240eb0f6507b456bbe09c1121",
-                "reference": "a8b9fc170115333240eb0f6507b456bbe09c1121",
+                "url": "https://api.github.com/repos/orchestral/testbench-core/zipball/9ef7319cc288a613e38f456f0349907dfeb2587f",
+                "reference": "9ef7319cc288a613e38f456f0349907dfeb2587f",
                 "shasum": ""
             },
             "require": {
@@ -2379,7 +2379,7 @@
                 "orchestral",
                 "testing"
             ],
-            "time": "2018-10-03T07:44:35+00:00"
+            "time": "2018-10-07T01:22:19+00:00"
         },
         {
             "name": "phar-io/manifest",
diff --git a/src/Generator.php b/src/Generator.php
index 6ac521f..5a8d155 100644
--- a/src/Generator.php
+++ b/src/Generator.php
@@ -5,6 +5,7 @@
 use Carbon\Carbon;
 use Clarkeash\Doorman\Exceptions\DuplicateException;
 use Clarkeash\Doorman\Models\Invite;
+use Illuminate\Support\Str;
 
 class Generator
 {
@@ -94,7 +95,7 @@ public function expiresIn($days = 14)
     protected function build(): Invite
     {
         $invite = new Invite;
-        $invite->code = $this->manager->code();
+        $invite->code = Str::upper($this->manager->code());
         $invite->for = $this->email;
         $invite->max = $this->uses;
         $invite->valid_until = $this->expiry;
diff --git a/tests/Feature/CheckInvitesTest.php b/tests/Feature/CheckInvitesTest.php
index c0b197c..3fe3460 100644
--- a/tests/Feature/CheckInvitesTest.php
+++ b/tests/Feature/CheckInvitesTest.php
@@ -100,4 +100,18 @@ public function it_can_have_unlimited_redemptions()
             Assert::assertTrue(Doorman::check('ABCDE'));
         }
     }
+
+    /**
+    * @test
+    */
+    public function it_is_not_case_sensitive()
+    {
+        Invite::forceCreate([
+            'code' => 'ABCDE',
+        ]);
+
+        Assert::assertTrue(Doorman::check('ABCDE'));
+        Assert::assertTrue(Doorman::check('abcde'));
+        Assert::assertTrue(Doorman::check('AbCdE'));
+    }
 }
diff --git a/tests/Feature/GenerateInvitesTest.php b/tests/Feature/GenerateInvitesTest.php
index 1c41afe..c80489d 100644
--- a/tests/Feature/GenerateInvitesTest.php
+++ b/tests/Feature/GenerateInvitesTest.php
@@ -115,4 +115,16 @@ public function only_one_invite_per_email_can_be_generated_2()
     {
         Doorman::generate()->for('me@ashleyclarke.me')->times(3)->make();
     }
+
+    /**
+    * @test
+    */
+    public function generated_codes_should_always_be_uppercase()
+    {
+        Doorman::generate()->make();
+
+        $invite = Invite::first();
+
+        Assert::assertEquals(strtoupper($invite->code), $invite->code);
+    }
 }