diff --git a/web/charts/lib/behaviors/slider.dart b/web/charts/lib/behaviors/slider.dart
index 20ec73b23..4b2c7d842 100644
--- a/web/charts/lib/behaviors/slider.dart
+++ b/web/charts/lib/behaviors/slider.dart
@@ -17,7 +17,6 @@ import 'dart:math';
 // EXCLUDE_FROM_GALLERY_DOCS_END
 import 'package:charts_flutter/flutter.dart' as charts;
 import 'package:flutter/material.dart';
-import 'package:flutter/rendering.dart';
 import 'package:flutter/scheduler.dart';
 
 /// This is just a simple line chart with a behavior that adds slider controls.
diff --git a/web/github_dataviz/lib/constants.dart b/web/github_dataviz/lib/constants.dart
index f5aa3a800..dceba4e27 100644
--- a/web/github_dataviz/lib/constants.dart
+++ b/web/github_dataviz/lib/constants.dart
@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'dart:ui';
 
 class Constants {
   static const Color backgroundColor = Color(0xFF000020);
diff --git a/web/github_dataviz/lib/layered_chart.dart b/web/github_dataviz/lib/layered_chart.dart
index 45744956a..b6ee1822d 100644
--- a/web/github_dataviz/lib/layered_chart.dart
+++ b/web/github_dataviz/lib/layered_chart.dart
@@ -1,8 +1,6 @@
 import 'dart:math';
 
 import 'package:flutter/material.dart';
-import 'package:flutter/painting.dart';
-import 'package:flutter/widgets.dart';
 import 'package:github_dataviz/catmull.dart';
 import 'package:github_dataviz/constants.dart';
 import 'package:github_dataviz/data/data_series.dart';
diff --git a/web/slide_puzzle b/web/slide_puzzle
index 023a0ee1f..7b2f326b6 160000
--- a/web/slide_puzzle
+++ b/web/slide_puzzle
@@ -1 +1 @@
-Subproject commit 023a0ee1fa1267001c170ea58a0c600b9c2138c1
+Subproject commit 7b2f326b6a1733c2d31ce9c7cc6e5d7d8d405d07