diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5905336d..2d6bbeba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 3.0.6
+* Remove static default values for `middleware`.
+
 # 3.0.5
 * Add `MiddlewarePipelineIterator`.
 
diff --git a/lib/browser.dart b/lib/browser.dart
index 01b77cde..b1a77218 100644
--- a/lib/browser.dart
+++ b/lib/browser.dart
@@ -72,7 +72,9 @@ abstract class _BrowserRouterImpl<T> extends Router<T>
       all(path, handler, middleware: middleware);
 
   void prepareAnchors() {
-    final anchors = window.document.querySelectorAll('a'); //:not([dynamic])');
+    final anchors = window.document
+        .querySelectorAll('a')
+        .cast<AnchorElement>(); //:not([dynamic])');
 
     for (final AnchorElement $a in anchors) {
       if ($a.attributes.containsKey('href') &&
diff --git a/lib/src/router.dart b/lib/src/router.dart
index e36df6f8..d01297ec 100644
--- a/lib/src/router.dart
+++ b/lib/src/router.dart
@@ -69,7 +69,8 @@ class Router<T> {
   /// for requests with the given method (case-insensitive).
   /// Provide '*' as the method to respond to all methods.
   Route<T> addRoute(String method, String path, T handler,
-      {Iterable<T> middleware: const []}) {
+      {Iterable<T> middleware}) {
+    middleware ??= <T>[];
     if (_useCache == true)
       throw new StateError('Cannot add routes after caching is enabled.');
 
@@ -164,7 +165,8 @@ class Router<T> {
   /// Returns the created route.
   /// You can also register middleware within the router.
   SymlinkRoute<T> group(String path, void callback(Router<T> router),
-      {Iterable<T> middleware: const [], String name: null}) {
+      {Iterable<T> middleware, String name: null}) {
+    middleware ??= <T>[];
     final router = new Router<T>().._middleware.addAll(middleware);
     callback(router);
     return mount(path, router)..name = name;
@@ -402,15 +404,16 @@ class _ChainedRouter<T> extends Router<T> {
 
   @override
   Route<T> addRoute(String method, String path, handler,
-      {Iterable<T> middleware: const []}) {
+      {Iterable<T> middleware}) {
     var route = super.addRoute(method, path, handler,
         middleware: []..addAll(_handlers)..addAll(middleware ?? []));
     //_root._routes.add(route);
     return route;
   }
 
+  @override
   SymlinkRoute<T> group(String path, void callback(Router<T> router),
-      {Iterable<T> middleware: const [], String name: null}) {
+      {Iterable<T> middleware, String name: null}) {
     final router =
         new _ChainedRouter<T>(_root, []..addAll(_handlers)..addAll(middleware));
     callback(router);
diff --git a/pubspec.yaml b/pubspec.yaml
index 3e4cf386..114560c2 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: angel_route
 description: A powerful, isomorphic routing library for Dart. It is mainly used in the Angel framework, but can be used in Flutter and on the Web.
-version: 3.0.5
+version: 3.0.6
 author: Tobe O <thosakwe@gmail.com>
 homepage: https://github.com/angel-dart/angel_route
 environment: