diff --git a/framework/core/src/Foundation/AbstractServiceProvider.php b/framework/core/src/Foundation/AbstractServiceProvider.php
index 97f699da99..faf7e17507 100644
--- a/framework/core/src/Foundation/AbstractServiceProvider.php
+++ b/framework/core/src/Foundation/AbstractServiceProvider.php
@@ -9,24 +9,17 @@
 
 namespace Flarum\Foundation;
 
-use Illuminate\Contracts\Container\Container;
+use Illuminate\Contracts\Foundation\Application as ApplicationContract;
 use Illuminate\Support\ServiceProvider;
 
 abstract class AbstractServiceProvider extends ServiceProvider
 {
-    /**
-     * @deprecated perpetually, not removed because Laravel needs it.
-     * @var Container
-     */
-    protected $app;
+    protected ApplicationContract $container;
 
-    public function __construct(
-        protected Container $container
-    ) {
-        parent::__construct($container);
-    }
-
-    public function register()
+    public function __construct(ApplicationContract $app)
     {
+        parent::__construct($app);
+
+        $this->container = $app;
     }
 }
diff --git a/framework/core/src/Foundation/Application.php b/framework/core/src/Foundation/Application.php
index eb51c40abd..90b2bb7241 100644
--- a/framework/core/src/Foundation/Application.php
+++ b/framework/core/src/Foundation/Application.php
@@ -9,13 +9,17 @@
 
 namespace Flarum\Foundation;
 
-use Illuminate\Contracts\Container\Container;
+use Flarum\Foundation\Concerns\InteractsWithLaravel;
+use Illuminate\Container\Container as IlluminateContainer;
+use Illuminate\Contracts\Foundation\Application as LaravelApplication;
 use Illuminate\Events\EventServiceProvider;
 use Illuminate\Support\Arr;
 use Illuminate\Support\ServiceProvider;
 
-class Application
+class Application extends IlluminateContainer implements LaravelApplication
 {
+    use InteractsWithLaravel;
+
     /**
      * The Flarum version.
      *
@@ -34,7 +38,6 @@ class Application
     protected array $loadedProviders = [];
 
     public function __construct(
-        private readonly Container $container,
         protected Paths $paths
     ) {
         $this->registerBaseBindings();
@@ -44,19 +47,14 @@ public function __construct(
 
     public function config(string $key, mixed $default = null): mixed
     {
-        $config = $this->container->make('flarum.config');
+        $config = $this->make('flarum.config');
 
         return $config[$key] ?? $default;
     }
 
-    public function inDebugMode(): bool
-    {
-        return $this->config('debug', true);
-    }
-
     public function url(string $path = null): string
     {
-        $config = $this->container->make('flarum.config');
+        $config = $this->make('flarum.config');
         $url = (string) $config->url();
 
         if ($path) {
@@ -68,31 +66,27 @@ public function url(string $path = null): string
 
     protected function registerBaseBindings(): void
     {
-        \Illuminate\Container\Container::setInstance($this->container);
+        IlluminateContainer::setInstance($this);
 
-        /**
-         * Needed for the laravel framework code.
-         * Use container inside flarum instead.
-         */
-        $this->container->instance('app', $this->container);
-        $this->container->alias('app', \Illuminate\Container\Container::class);
+        $this->instance('app', $this);
+        $this->alias('app', IlluminateContainer::class);
 
-        $this->container->instance('container', $this->container);
-        $this->container->alias('container', \Illuminate\Container\Container::class);
+        $this->instance('container', $this);
+        $this->alias('container', IlluminateContainer::class);
 
-        $this->container->instance('flarum', $this);
-        $this->container->alias('flarum', self::class);
+        $this->instance('flarum', $this);
+        $this->alias('flarum', self::class);
 
-        $this->container->instance('flarum.paths', $this->paths);
-        $this->container->alias('flarum.paths', Paths::class);
+        $this->instance('flarum.paths', $this->paths);
+        $this->alias('flarum.paths', Paths::class);
     }
 
     protected function registerBaseServiceProviders(): void
     {
-        $this->register(new EventServiceProvider($this->container));
+        $this->register(new EventServiceProvider($this));
     }
 
-    public function register(string|ServiceProvider $provider, array $options = [], bool $force = false): ServiceProvider
+    public function register($provider, $force = false): ServiceProvider
     {
         if (($registered = $this->getProvider($provider)) && ! $force) {
             return $registered;
@@ -102,18 +96,11 @@ public function register(string|ServiceProvider $provider, array $options = [],
         // application instance automatically for the developer. This is simply
         // a more convenient way of specifying your service provider classes.
         if (is_string($provider)) {
-            $provider = $this->resolveProviderClass($provider);
+            $provider = $this->resolveProvider($provider);
         }
 
         $provider->register();
 
-        // Once we have registered the service we will iterate through the options
-        // and set each of them on the application so they will be available on
-        // the actual loading of the service objects and for developer usage.
-        foreach ($options as $key => $value) {
-            $this[$key] = $value;
-        }
-
         $this->markAsRegistered($provider);
 
         // If the application has already booted, we will call this boot method on
@@ -140,14 +127,14 @@ public function getProvider(string|ServiceProvider $provider): ?ServiceProvider
      *
      * @param class-string<ServiceProvider> $provider
      */
-    public function resolveProviderClass(string $provider): ServiceProvider
+    public function resolveProvider($provider): ServiceProvider
     {
-        return new $provider($this->container);
+        return new $provider($this);
     }
 
     protected function markAsRegistered(ServiceProvider $provider): void
     {
-        $this->container['events']->dispatch($class = get_class($provider), [$provider]);
+        $this['events']->dispatch($class = get_class($provider), [$provider]);
 
         $this->serviceProviders[] = $provider;
 
@@ -182,7 +169,7 @@ public function boot(): void
     protected function bootProvider(ServiceProvider $provider): mixed
     {
         if (method_exists($provider, 'boot')) {
-            return $this->container->call([$provider, 'boot']);
+            return $this->call([$provider, 'boot']);
         }
 
         return null;
@@ -232,7 +219,7 @@ public function registerCoreContainerAliases(): void
 
         foreach ($aliases as $key => $aliasGroup) {
             foreach ($aliasGroup as $alias) {
-                $this->container->alias($key, $alias);
+                $this->alias($key, $alias);
             }
         }
     }
@@ -241,12 +228,4 @@ public function version(): string
     {
         return static::VERSION;
     }
-
-    public function terminating(): void
-    {
-    }
-
-    public function terminate(): void
-    {
-    }
 }
diff --git a/framework/core/src/Foundation/Concerns/InteractsWithLaravel.php b/framework/core/src/Foundation/Concerns/InteractsWithLaravel.php
new file mode 100644
index 0000000000..58ea69cd76
--- /dev/null
+++ b/framework/core/src/Foundation/Concerns/InteractsWithLaravel.php
@@ -0,0 +1,225 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Foundation\Concerns;
+
+use Flarum\Locale\LocaleManager;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Str;
+
+/**
+ * Implementation of the Laravel Application Contract,
+ * for the sake of better integration with Laravel packages/ecosystem.
+ */
+trait InteractsWithLaravel
+{
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function terminating($callback): static
+    {
+        return $this;
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function terminate(): void
+    {
+        //
+    }
+
+    public function basePath($path = ''): string
+    {
+        return $this->joinPaths($this->paths->base, $path);
+    }
+
+    public function publicPath($path = ''): string
+    {
+        return $this->joinPaths($this->paths->public, $path);
+    }
+
+    public function storagePath($path = ''): string
+    {
+        return $this->joinPaths($this->paths->storage, $path);
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function bootstrapPath($path = ''): string
+    {
+        return $this->joinPaths(
+            $this->joinPaths($this->paths->base, 'bootstrap'),
+            $path
+        );
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function configPath($path = ''): string
+    {
+        return $this->joinPaths(
+            $this->joinPaths($this->paths->storage, 'config'),
+            $path
+        );
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function databasePath($path = ''): string
+    {
+        return $this->joinPaths(
+            $this->joinPaths($this->paths->base, 'database'),
+            $path
+        );
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function langPath($path = ''): string
+    {
+        return $this->joinPaths(
+            $this->joinPaths($this->paths->base, 'lang'),
+            $path
+        );
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function resourcePath($path = ''): string
+    {
+        return $this->joinPaths(
+            $this->joinPaths($this->paths->base, 'resources'),
+            $path
+        );
+    }
+
+    public function environment(...$environments): bool|string
+    {
+        if (count($environments) > 0) {
+            $patterns = is_array($environments[0]) ? $environments[0] : $environments;
+
+            return Str::is($patterns, $this['env']);
+        }
+
+        return $this['env'];
+    }
+
+    public function runningInConsole(): bool
+    {
+        return \PHP_SAPI === 'cli' || \PHP_SAPI === 'phpdbg';
+    }
+
+    public function runningUnitTests(): bool
+    {
+        return $this->bound('env') && $this->environment('testing');
+    }
+
+    public function hasDebugModeEnabled(): bool
+    {
+        return $this->config('debug', true);
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function maintenanceMode()
+    {
+        return null; // @phpstan-ignore-line
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function isDownForMaintenance(): bool
+    {
+        // TODO: Implement isDownForMaintenance() method.
+        return false;
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function registerConfiguredProviders(): void
+    {
+        //
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function registerDeferredProvider($provider, $service = null): void
+    {
+        //
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function bootstrapWith(array $bootstrappers): void
+    {
+        //
+    }
+
+    public function getLocale(): string
+    {
+        return $this->make(LocaleManager::class)->getLocale();
+    }
+
+    public function getNamespace(): string
+    {
+        return 'Flarum';
+    }
+
+    public function getProviders($provider): array
+    {
+        $name = is_string($provider) ? $provider : get_class($provider);
+
+        return Arr::where($this->serviceProviders, fn ($value) => $value instanceof $name);
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function hasBeenBootstrapped(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function loadDeferredProviders(): void
+    {
+        //
+    }
+
+    public function setLocale($locale): void
+    {
+        $this->make(LocaleManager::class)->setLocale($locale);
+    }
+
+    /**
+     * @deprecated Not actually used/has no meaning in Flarum.
+     */
+    public function shouldSkipMiddleware(): bool
+    {
+        return false;
+    }
+
+    public function joinPaths(string $basePath, string $path = ''): string
+    {
+        return $basePath.($path != '' ? DIRECTORY_SEPARATOR.ltrim($path, DIRECTORY_SEPARATOR) : '');
+    }
+}
diff --git a/framework/core/src/Foundation/Config.php b/framework/core/src/Foundation/Config.php
index c816793942..87c1409f83 100644
--- a/framework/core/src/Foundation/Config.php
+++ b/framework/core/src/Foundation/Config.php
@@ -69,4 +69,9 @@ public function offsetUnset($offset): void
     {
         throw new RuntimeException('The Config is immutable');
     }
+
+    public function environment(): string
+    {
+        return $this->data['env'] ?? 'production';
+    }
 }
diff --git a/framework/core/src/Foundation/Container.php b/framework/core/src/Foundation/Container.php
deleted file mode 100644
index 04ad0be5e3..0000000000
--- a/framework/core/src/Foundation/Container.php
+++ /dev/null
@@ -1,27 +0,0 @@
-<?php
-
-/*
- * This file is part of Flarum.
- *
- * For detailed copyright and license information, please view the
- * LICENSE file that was distributed with this source code.
- */
-
-namespace Flarum\Foundation;
-
-use Illuminate\Container\Container as LaravelContainer;
-
-class Container extends LaravelContainer
-{
-    /**
-     * Laravel's application is the container itself.
-     * So as we upgrade Laravel versions, some of its internals that we rely on
-     * make calls to methods that don't exist in our container, but do in Laravel's Application.
-     *
-     * @TODO: Implement the Application contract and merge the container into it.
-     */
-    public function __call(string $name, array $arguments): mixed
-    {
-        return $this->get('flarum')->$name(...$arguments);
-    }
-}
diff --git a/framework/core/src/Foundation/InstalledSite.php b/framework/core/src/Foundation/InstalledSite.php
index 2cdb50759b..2d52395f73 100644
--- a/framework/core/src/Foundation/InstalledSite.php
+++ b/framework/core/src/Foundation/InstalledSite.php
@@ -39,7 +39,7 @@
 use Illuminate\Config\Repository as ConfigRepository;
 use Illuminate\Contracts\Cache\Repository;
 use Illuminate\Contracts\Cache\Store;
-use Illuminate\Contracts\Container\Container as LaravelContainer;
+use Illuminate\Contracts\Container\Container;
 use Illuminate\Filesystem\Filesystem;
 use Illuminate\Hashing\HashServiceProvider;
 use Illuminate\Validation\ValidationServiceProvider;
@@ -87,62 +87,61 @@ public function extendWith(array $extenders): self
         return $this;
     }
 
-    protected function bootLaravel(): LaravelContainer
+    protected function bootLaravel(): Container
     {
-        $container = new Container;
-        $laravel = new Application($container, $this->paths);
-
-        $container->instance('env', 'production');
-        $container->instance('flarum.config', $this->config);
-        $container->alias('flarum.config', Config::class);
-        $container->instance('flarum.debug', $this->config->inDebugMode());
-        $container->instance('config', $this->getIlluminateConfig());
-        $container->instance('flarum.maintenance.handler', new MaintenanceModeHandler);
-
-        $this->registerLogger($container);
-        $this->registerCache($container);
-
-        $laravel->register(AdminServiceProvider::class);
-        $laravel->register(ApiServiceProvider::class);
-        $laravel->register(BusServiceProvider::class);
-        $laravel->register(ConsoleServiceProvider::class);
-        $laravel->register(DatabaseServiceProvider::class);
-        $laravel->register(DiscussionServiceProvider::class);
-        $laravel->register(ExtensionServiceProvider::class);
-        $laravel->register(ErrorServiceProvider::class);
-        $laravel->register(FilesystemServiceProvider::class);
-        $laravel->register(FilterServiceProvider::class);
-        $laravel->register(FormatterServiceProvider::class);
-        $laravel->register(ForumServiceProvider::class);
-        $laravel->register(FrontendServiceProvider::class);
-        $laravel->register(GroupServiceProvider::class);
-        $laravel->register(HashServiceProvider::class);
-        $laravel->register(HttpServiceProvider::class);
-        $laravel->register(LocaleServiceProvider::class);
-        $laravel->register(MailServiceProvider::class);
-        $laravel->register(NotificationServiceProvider::class);
-        $laravel->register(PostServiceProvider::class);
-        $laravel->register(QueueServiceProvider::class);
-        $laravel->register(SearchServiceProvider::class);
-        $laravel->register(SessionServiceProvider::class);
-        $laravel->register(SettingsServiceProvider::class);
-        $laravel->register(UpdateServiceProvider::class);
-        $laravel->register(UserServiceProvider::class);
-        $laravel->register(ValidationServiceProvider::class);
-        $laravel->register(ViewServiceProvider::class);
-
-        $laravel->booting(function () use ($container) {
+        $app = new Application($this->paths);
+
+        $app->instance('env', $this->config->environment());
+        $app->instance('flarum.config', $this->config);
+        $app->alias('flarum.config', Config::class);
+        $app->instance('flarum.debug', $this->config->inDebugMode());
+        $app->instance('config', $this->getIlluminateConfig());
+        $app->instance('flarum.maintenance.handler', new MaintenanceModeHandler);
+
+        $this->registerLogger($app);
+        $this->registerCache($app);
+
+        $app->register(AdminServiceProvider::class);
+        $app->register(ApiServiceProvider::class);
+        $app->register(BusServiceProvider::class);
+        $app->register(ConsoleServiceProvider::class);
+        $app->register(DatabaseServiceProvider::class);
+        $app->register(DiscussionServiceProvider::class);
+        $app->register(ExtensionServiceProvider::class);
+        $app->register(ErrorServiceProvider::class);
+        $app->register(FilesystemServiceProvider::class);
+        $app->register(FilterServiceProvider::class);
+        $app->register(FormatterServiceProvider::class);
+        $app->register(ForumServiceProvider::class);
+        $app->register(FrontendServiceProvider::class);
+        $app->register(GroupServiceProvider::class);
+        $app->register(HashServiceProvider::class);
+        $app->register(HttpServiceProvider::class);
+        $app->register(LocaleServiceProvider::class);
+        $app->register(MailServiceProvider::class);
+        $app->register(NotificationServiceProvider::class);
+        $app->register(PostServiceProvider::class);
+        $app->register(QueueServiceProvider::class);
+        $app->register(SearchServiceProvider::class);
+        $app->register(SessionServiceProvider::class);
+        $app->register(SettingsServiceProvider::class);
+        $app->register(UpdateServiceProvider::class);
+        $app->register(UserServiceProvider::class);
+        $app->register(ValidationServiceProvider::class);
+        $app->register(ViewServiceProvider::class);
+
+        $app->booting(function () use ($app) {
             // Run all local-site extenders before booting service providers
             // (but after those from "real" extensions, which have been set up
             // in a service provider above).
             foreach ($this->extenders as $extension) {
-                $extension->extend($container);
+                $extension->extend($app);
             }
         });
 
-        $laravel->boot();
+        $app->boot();
 
-        return $container;
+        return $app;
     }
 
     protected function getIlluminateConfig(): ConfigRepository
diff --git a/framework/core/src/Foundation/UninstalledSite.php b/framework/core/src/Foundation/UninstalledSite.php
index e933b8d04c..3fea1ad7f9 100644
--- a/framework/core/src/Foundation/UninstalledSite.php
+++ b/framework/core/src/Foundation/UninstalledSite.php
@@ -48,37 +48,36 @@ public function bootApp(): AppInterface
 
     protected function bootLaravel(): Container
     {
-        $container = new \Illuminate\Container\Container;
-        $laravel = new Application($container, $this->paths);
+        $app = new Application($this->paths);
 
-        $container->instance('env', 'production');
-        $container->instance('flarum.config', new Config(['url' => $this->baseUrl]));
-        $container->alias('flarum.config', Config::class);
-        $container->instance('flarum.debug', true);
-        $container->instance('config', $config = $this->getIlluminateConfig());
+        $app->instance('env', 'production');
+        $app->instance('flarum.config', new Config(['url' => $this->baseUrl]));
+        $app->alias('flarum.config', Config::class);
+        $app->instance('flarum.debug', true);
+        $app->instance('config', $config = $this->getIlluminateConfig());
 
-        $this->registerLogger($container);
+        $this->registerLogger($app);
 
-        $laravel->register(ErrorServiceProvider::class);
-        $laravel->register(LocaleServiceProvider::class);
-        $laravel->register(FilesystemServiceProvider::class);
-        $laravel->register(SessionServiceProvider::class);
-        $laravel->register(ValidationServiceProvider::class);
+        $app->register(ErrorServiceProvider::class);
+        $app->register(LocaleServiceProvider::class);
+        $app->register(FilesystemServiceProvider::class);
+        $app->register(SessionServiceProvider::class);
+        $app->register(ValidationServiceProvider::class);
 
-        $laravel->register(InstallServiceProvider::class);
+        $app->register(InstallServiceProvider::class);
 
-        $container->singleton(
+        $app->singleton(
             SettingsRepositoryInterface::class,
             UninstalledSettingsRepository::class
         );
 
-        $container->singleton('view', function ($container) {
+        $app->singleton('view', function ($app) {
             $engines = new EngineResolver();
-            $engines->register('php', function () use ($container) {
-                return $container->make(PhpEngine::class);
+            $engines->register('php', function () use ($app) {
+                return $app->make(PhpEngine::class);
             });
-            $finder = new FileViewFinder($container->make('files'), []);
-            $dispatcher = $container->make(Dispatcher::class);
+            $finder = new FileViewFinder($app->make('files'), []);
+            $dispatcher = $app->make(Dispatcher::class);
 
             return new \Illuminate\View\Factory(
                 $engines,
@@ -87,9 +86,9 @@ protected function bootLaravel(): Container
             );
         });
 
-        $laravel->boot();
+        $app->boot();
 
-        return $container;
+        return $app;
     }
 
     protected function getIlluminateConfig(): ConfigRepository
diff --git a/framework/core/src/helpers.php b/framework/core/src/helpers.php
index 6df8ffa4ca..b45ae2d869 100644
--- a/framework/core/src/helpers.php
+++ b/framework/core/src/helpers.php
@@ -7,8 +7,8 @@
  * LICENSE file that was distributed with this source code.
  */
 
-use Flarum\Foundation\Container;
 use Flarum\Foundation\Paths;
+use Illuminate\Container\Container;
 use Illuminate\Contracts\Config\Repository;
 
 if (! function_exists('resolve')) {
diff --git a/php-packages/testing/src/integration/TestCase.php b/php-packages/testing/src/integration/TestCase.php
index f2bdfb64a6..4c773e2621 100644
--- a/php-packages/testing/src/integration/TestCase.php
+++ b/php-packages/testing/src/integration/TestCase.php
@@ -46,6 +46,8 @@ protected function tearDown(): void
     protected function app()
     {
         if (is_null($this->app)) {
+            $this->config('env', 'testing');
+
             $bootstrapper = new Bootstrapper(
                 $this->config,
                 $this->extensions,