diff --git a/packages/flutter_tools/lib/src/isolated/devfs_web.dart b/packages/flutter_tools/lib/src/isolated/devfs_web.dart
index 903eae94f6..e9539482ab 100644
--- a/packages/flutter_tools/lib/src/isolated/devfs_web.dart
+++ b/packages/flutter_tools/lib/src/isolated/devfs_web.dart
@@ -295,7 +295,6 @@ class WebAssetServer implements AssetReader {
         server,
         PackageUriMapper(packageConfig),
         digestProvider,
-        server.basePath,
         packageConfig.toPackageUri(
           globals.fs.file(entrypoint).absolute.uri,
         ),
@@ -347,6 +346,7 @@ class WebAssetServer implements AssetReader {
   ///
   /// It should have no leading or trailing slashes.
   @visibleForTesting
+  @override
   String basePath;
 
   // handle requests for JavaScript source, dart sources maps, or asset files.
diff --git a/packages/flutter_tools/pubspec.yaml b/packages/flutter_tools/pubspec.yaml
index db71a194d1..4307ba5334 100644
--- a/packages/flutter_tools/pubspec.yaml
+++ b/packages/flutter_tools/pubspec.yaml
@@ -11,7 +11,7 @@ dependencies:
   args: 2.4.2
   browser_launcher: 1.1.1
   dds: 2.9.4
-  dwds: 19.0.2
+  dwds: 20.0.1
   completion: 1.0.1
   coverage: 1.6.3
   crypto: 3.0.3
@@ -107,4 +107,4 @@ dartdoc:
   # Exclude this package from the hosted API docs.
   nodoc: true
 
-# PUBSPEC CHECKSUM: 1a86
+# PUBSPEC CHECKSUM: f97d