diff --git a/CHANGELOG-5.3.md b/CHANGELOG-5.3.md
index 32d2d4c4a070..f328d9395653 100644
--- a/CHANGELOG-5.3.md
+++ b/CHANGELOG-5.3.md
@@ -16,8 +16,6 @@
 - Don't report exceptions inside queue worker signal handler ([#16738](https://github.com/laravel/framework/pull/16738))
 - Kill timed out queue worker process ([#16746](https://github.com/laravel/framework/pull/16746))
 - Removed unnecessary check in `ScheduleRunCommand::fire()` ([#16752](https://github.com/laravel/framework/pull/16752))
-- Improved performance of `Str::startsWith()` ([#16761](https://github.com/laravel/framework/pull/16761))
-- Improved handling of numeric values in `Str::startsWith()` ([#16770](https://github.com/laravel/framework/pull/16770))
 
 ### Fixed
 - Added file existance check to `AppNameCommand::replaceIn()` to fix [#16575](https://github.com/laravel/framework/pull/16575) ([#16592](https://github.com/laravel/framework/pull/16592))
diff --git a/src/Illuminate/Routing/Router.php b/src/Illuminate/Routing/Router.php
index cbfcdb224757..ef866235fdec 100644
--- a/src/Illuminate/Routing/Router.php
+++ b/src/Illuminate/Routing/Router.php
@@ -804,7 +804,7 @@ public function substituteImplicitBindings($route)
                 ! $route->getParameter($parameter->name) instanceof Model) {
                 $method = $parameter->isDefaultValueAvailable() ? 'first' : 'firstOrFail';
 
-                $model = $class->newInstance();
+                $model = $this->container->make($class->name);
 
                 $route->setParameter(
                     $parameter->name, $model->where(
diff --git a/tests/Routing/RoutingRouteTest.php b/tests/Routing/RoutingRouteTest.php
index f0be3e4bd690..c0ffb9bba5f2 100644
--- a/tests/Routing/RoutingRouteTest.php
+++ b/tests/Routing/RoutingRouteTest.php
@@ -1155,6 +1155,25 @@ public function testImplicitBindingsWithOptionalParameter()
         $router->dispatch(Request::create('bar', 'GET'))->getContent();
     }
 
+    public function testImplicitBindingThroughIOC()
+    {
+        $phpunit = $this;
+        $container = new Container;
+        $router = new Router(new Dispatcher, $container);
+        $container->singleton(Registrar::class, function () use ($router) {
+            return $router;
+        });
+
+        $container->bind('RoutingTestUserModel', 'RoutingTestExtendedUserModel');
+        $router->get('foo/{bar}', [
+            'middleware' => SubstituteBindings::class,
+            'uses' => function (RoutingTestUserModel $bar) use ($phpunit) {
+                $phpunit->assertInstanceOf(RoutingTestExtendedUserModel::class, $bar);
+            },
+        ]);
+        $router->dispatch(Request::create('foo/baz', 'GET'))->getContent();
+    }
+
     public function testDispatchingCallableActionClasses()
     {
         $router = $this->getRouter();
@@ -1390,6 +1409,10 @@ public function firstOrFail()
     }
 }
 
+class RoutingTestExtendedUserModel extends RoutingTestUserModel
+{
+}
+
 class ActionStub
 {
     public function __invoke()