diff --git a/pkgs/matcher/lib/src/map_matchers.dart b/pkgs/matcher/lib/src/map_matchers.dart
index 5328b88b9..4476d0637 100644
--- a/pkgs/matcher/lib/src/map_matchers.dart
+++ b/pkgs/matcher/lib/src/map_matchers.dart
@@ -2,20 +2,21 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'feature_matcher.dart';
 import 'interfaces.dart';
 import 'util.dart';
 
 /// Returns a matcher which matches maps containing the given [value].
 Matcher containsValue(Object? value) => _ContainsValue(value);
 
-class _ContainsValue extends FeatureMatcher<Map> {
+class _ContainsValue extends Matcher {
   final Object? _value;
 
   const _ContainsValue(this._value);
 
   @override
-  bool typedMatches(Map item, Map matchState) => item.containsValue(_value);
+  bool matches(Object? item, Map matchState) =>
+      // ignore: avoid_dynamic_calls
+      (item as dynamic).containsValue(_value);
   @override
   Description describe(Description description) =>
       description.add('contains value ').addDescriptionOf(_value);
@@ -26,15 +27,17 @@ class _ContainsValue extends FeatureMatcher<Map> {
 Matcher containsPair(Object? key, Object? valueOrMatcher) =>
     _ContainsMapping(key, wrapMatcher(valueOrMatcher));
 
-class _ContainsMapping extends FeatureMatcher<Map> {
+class _ContainsMapping extends Matcher {
   final Object? _key;
   final Matcher _valueMatcher;
 
   const _ContainsMapping(this._key, this._valueMatcher);
 
   @override
-  bool typedMatches(Map item, Map matchState) =>
-      item.containsKey(_key) && _valueMatcher.matches(item[_key], matchState);
+  bool matches(Object? item, Map matchState) =>
+      // ignore: avoid_dynamic_calls
+      (item as dynamic).containsKey(_key) &&
+      _valueMatcher.matches((item as dynamic)[_key], matchState);
 
   @override
   Description describe(Description description) {
@@ -46,9 +49,10 @@ class _ContainsMapping extends FeatureMatcher<Map> {
   }
 
   @override
-  Description describeTypedMismatch(
-      Map item, Description mismatchDescription, Map matchState, bool verbose) {
-    if (!item.containsKey(_key)) {
+  Description describeMismatch(Object? item, Description mismatchDescription,
+      Map matchState, bool verbose) {
+    // ignore: avoid_dynamic_calls
+    if (!((item as dynamic).containsKey(_key) as bool)) {
       return mismatchDescription
           .add(" doesn't contain key ")
           .addDescriptionOf(_key);
@@ -58,7 +62,7 @@ class _ContainsMapping extends FeatureMatcher<Map> {
           .addDescriptionOf(_key)
           .add(' but with value ');
       _valueMatcher.describeMismatch(
-          item[_key], mismatchDescription, matchState, verbose);
+          (item as dynamic)[_key], mismatchDescription, matchState, verbose);
       return mismatchDescription;
     }
   }