Laravel 5.8

app/Http/Controllers/LookupController.php

@@ -12,7 +12,7 @@ class LookupController {
             throw new HttpException(400);
         }
 
-        return Cache::remember('isbn_' . $isbn, 1440, function() use ($isbn) {
+        return Cache::remember('isbn_' . $isbn, 86400, function() use ($isbn) {
             $google_books = new GoogleBooks();
 
             return $google_books->lookup($isbn);

composer.json

@@ -5,20 +5,22 @@
     "license": "MIT",
     "type": "project",
     "require": {
-        "php": ">=7.0.0",
+        "php": "^7.1.3",
         "fideloper/proxy": "^4.0",
         "google/apiclient": "^2.2",
         "guzzlehttp/guzzle": "~6.0",
-        "laravel/framework": "5.6.*",
+        "laravel/framework": "5.8.*",
         "laravel/tinker": "~1.0",
         "sunra/php-simple-html-dom-parser": "^1.5",
-        "yajra/laravel-datatables-oracle": "~8.0"
+        "yajra/laravel-datatables-oracle": "^9.0"
     },
     "require-dev": {
-        "filp/whoops": "~2.0",
-        "fzaninotto/faker": "~1.4",
-        "mockery/mockery": "~1.0",
-        "phpunit/phpunit": "~6.0"
+        "beyondcode/laravel-dump-server": "^1.0",
+        "filp/whoops": "^2.0",
+        "fzaninotto/faker": "^1.4",
+        "mockery/mockery": "^1.0",
+        "nunomaduro/collision": "^2.0",
+        "phpunit/phpunit": "^7.0"
     },
     "autoload": {
         "classmap": [