diff --git a/scroll_overlay/README.md b/scroll_overlay/README.md
index f106778..201e227 100644
--- a/scroll_overlay/README.md
+++ b/scroll_overlay/README.md
@@ -1,3 +1,7 @@
 # Scroll Overlay
 
-Overlays a native scroll view over the Flutter view. The scroll view displays items of a random color and opacity. The scroll view forwards all touch events it receives to the underlying Flutter view. This way, the scroll behavior of Flutter and native controls can be compared.
+Overlays a native scroll view over the Flutter view.
+The scroll view displays items of a random color and opacity.
+The scroll view forwards all touch events it receives to the
+underlying Flutter view.  This way, the scroll behavior of
+Flutter and native controls can be compared.
diff --git a/scroll_overlay/android/app/src/main/java/io/flutter/scroll_overlay/ScrollOverlayActivity.java b/scroll_overlay/android/app/src/main/java/io/flutter/scroll_overlay/ScrollOverlayActivity.java
index 77b7a1f..bd56b55 100644
--- a/scroll_overlay/android/app/src/main/java/io/flutter/scroll_overlay/ScrollOverlayActivity.java
+++ b/scroll_overlay/android/app/src/main/java/io/flutter/scroll_overlay/ScrollOverlayActivity.java
@@ -204,11 +204,23 @@ public OverlayViewHolder(@NonNull View itemView) {
              */
             static final int baseItemExtent = 40;
 
+            // Our desired height is in logical pixels, aka dp, but we have to set the
+            // height in the layout as an integer in physical pixels.  If we just
+            // multiply and round, the rounding errors compared to Flutter will add up,
+            // and can get us noticeably out of alignment within a screenful.  So we
+            // compute the exact total offsets in dp and apply the lossy unit conversion
+            // directly to those.
+            private int offsetToTop(int position) {
+                // This is the sum baseItemExtent + (baseItemExtent + 1) + (baseItemExtent + 2) + ….
+                int topInDp = position * baseItemExtent + position * (position - 1) / 2;
+                return (int) TypedValue
+                        .applyDimension(TypedValue.COMPLEX_UNIT_DIP, topInDp, getResources().getDisplayMetrics());
+            }
+
             void bind(int position) {
                 int color = OVERLAY_COLORS[position % OVERLAY_COLORS.length];
                 itemView.setBackground(new ColorDrawable(color));
-                final int height = (int) TypedValue
-                        .applyDimension(TypedValue.COMPLEX_UNIT_DIP, baseItemExtent + position, getResources().getDisplayMetrics());
+                final int height = offsetToTop(position + 1) - offsetToTop(position);
                 itemView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, height));
                 TextView textView = itemView.findViewById(R.id.text_view);
                 textView.setText("Android " + position);
diff --git a/scroll_overlay/lib/main.dart b/scroll_overlay/lib/main.dart
index adc171e..e0e62ac 100644
--- a/scroll_overlay/lib/main.dart
+++ b/scroll_overlay/lib/main.dart
@@ -22,7 +22,7 @@ void main() {
 }
 
 class FlutterDemo extends StatefulWidget {
-  const FlutterDemo({Key? key}) : super(key: key);
+  const FlutterDemo({super.key});
 
   @override
   _FlutterDemoState createState() => _FlutterDemoState();
diff --git a/scroll_overlay/pubspec.lock b/scroll_overlay/pubspec.lock
index dacbccd..de9b7f0 100644
--- a/scroll_overlay/pubspec.lock
+++ b/scroll_overlay/pubspec.lock
@@ -5,53 +5,59 @@ packages:
     dependency: transitive
     description:
       name: characters
-      url: "https://pub.dartlang.org"
+      sha256: e6a326c8af69605aec75ed6c187d06b349707a27fbff8222ca9cc2cff167975c
+      url: "https://pub.dev"
     source: hosted
-    version: "1.2.0"
+    version: "1.2.1"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.dartlang.org"
+      sha256: cfc915e6923fe5ce6e153b0723c753045de46de1b4d63771530504004a45fae0
+      url: "https://pub.dev"
     source: hosted
-    version: "1.15.0"
+    version: "1.17.0"
   flutter:
     dependency: "direct main"
     description: flutter
     source: sdk
     version: "0.0.0"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      sha256: "5528c2f391ededb7775ec1daa69e65a2d61276f7552de2b5f7b8d34ee9fd4ab7"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.5"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
-      url: "https://pub.dartlang.org"
+      sha256: d92141dc6fe1dad30722f9aa826c7fbc896d021d792f80678280601aff8cf724
+      url: "https://pub.dev"
     source: hosted
-    version: "0.1.4"
+    version: "0.2.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.dartlang.org"
+      sha256: "6c268b42ed578a53088d834796959e4a1814b5e9e164f147f580a386e5decf42"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0"
   sky_engine:
     dependency: transitive
     description: flutter
     source: sdk
     version: "0.0.99"
-  typed_data:
-    dependency: transitive
-    description:
-      name: typed_data
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
-      url: "https://pub.dartlang.org"
+      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
 sdks:
-  dart: ">=2.14.0 <3.0.0"
+  dart: ">=2.17.0 <3.0.0"
diff --git a/scroll_overlay/pubspec.yaml b/scroll_overlay/pubspec.yaml
index d902cda..a3307ed 100644
--- a/scroll_overlay/pubspec.yaml
+++ b/scroll_overlay/pubspec.yaml
@@ -2,7 +2,7 @@ name: scroll_overlay
 description: A Flutter app that overlays a native scroll view over the Flutter view.
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.17.0 <3.0.0'
 
 dependencies:
   flutter: