diff --git a/web/charts/common/pubspec.lock b/web/charts/common/pubspec.lock
index e33869b0a..f222a5d0a 100644
--- a/web/charts/common/pubspec.lock
+++ b/web/charts/common/pubspec.lock
@@ -21,7 +21,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -350,21 +350,21 @@ packages:
       name: vm_service_lib
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.21.0"
+    version: "3.22.2"
   watcher:
     dependency: transitive
     description:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
diff --git a/web/charts/example/pubspec.lock b/web/charts/example/pubspec.lock
index b66e3bf25..7b2d34618 100644
--- a/web/charts/example/pubspec.lock
+++ b/web/charts/example/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.37.0"
   archive:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   bazel_worker:
     dependency: transitive
     description:
@@ -42,7 +42,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.4"
+    version: "1.1.5"
   build_config:
     dependency: transitive
     description:
@@ -63,14 +63,14 @@ packages:
       name: build_modules
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.0.6"
   build_runner:
     dependency: "direct dev"
     description:
@@ -91,7 +91,7 @@ packages:
       name: build_web_compilers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,7 +105,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.6.0"
+    version: "6.7.0"
   charcode:
     dependency: transitive
     description:
@@ -181,7 +181,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -190,7 +190,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -200,7 +200,7 @@ packages:
       name: front_end
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.19"
+    version: "0.1.20"
   glob:
     dependency: transitive
     description:
@@ -277,7 +277,7 @@ packages:
       name: kernel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.3.20"
   logging:
     dependency: transitive
     description:
@@ -347,7 +347,7 @@ packages:
       name: protobuf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.14"
+    version: "0.13.15"
   pub_semver:
     dependency: transitive
     description:
@@ -466,14 +466,14 @@ packages:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
diff --git a/web/charts/flutter/pubspec.lock b/web/charts/flutter/pubspec.lock
index 4b85c4c92..20733dd5f 100644
--- a/web/charts/flutter/pubspec.lock
+++ b/web/charts/flutter/pubspec.lock
@@ -21,7 +21,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -76,7 +76,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -85,7 +85,7 @@ packages:
     description:
       path: "packages/flutter_web_test"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -94,7 +94,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -391,21 +391,21 @@ packages:
       name: vm_service_lib
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.21.0"
+    version: "3.22.2"
   watcher:
     dependency: transitive
     description:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
@@ -414,4 +414,4 @@ packages:
     source: hosted
     version: "2.1.16"
 sdks:
-  dart: ">=2.2.2 <3.0.0"
+  dart: ">=2.3.0-dev <3.0.0"
diff --git a/web/dad_jokes/pubspec.lock b/web/dad_jokes/pubspec.lock
index 15513c7a0..7042dc384 100644
--- a/web/dad_jokes/pubspec.lock
+++ b/web/dad_jokes/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.37.0"
   archive:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   bazel_worker:
     dependency: transitive
     description:
@@ -42,7 +42,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.4"
+    version: "1.1.5"
   build_config:
     dependency: transitive
     description:
@@ -63,14 +63,14 @@ packages:
       name: build_modules
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.0.6"
   build_runner:
     dependency: "direct dev"
     description:
@@ -91,7 +91,7 @@ packages:
       name: build_web_compilers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,7 +105,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.6.0"
+    version: "6.7.0"
   charcode:
     dependency: transitive
     description:
@@ -167,7 +167,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -176,7 +176,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -186,7 +186,7 @@ packages:
       name: front_end
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.19"
+    version: "0.1.20"
   glob:
     dependency: transitive
     description:
@@ -263,7 +263,7 @@ packages:
       name: kernel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.3.20"
   logging:
     dependency: transitive
     description:
@@ -333,7 +333,7 @@ packages:
       name: protobuf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.14"
+    version: "0.13.15"
   pub_semver:
     dependency: transitive
     description:
@@ -452,14 +452,14 @@ packages:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
diff --git a/web/filipino_cuisine/pubspec.lock b/web/filipino_cuisine/pubspec.lock
index 15513c7a0..7042dc384 100644
--- a/web/filipino_cuisine/pubspec.lock
+++ b/web/filipino_cuisine/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.37.0"
   archive:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   bazel_worker:
     dependency: transitive
     description:
@@ -42,7 +42,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.4"
+    version: "1.1.5"
   build_config:
     dependency: transitive
     description:
@@ -63,14 +63,14 @@ packages:
       name: build_modules
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.0.6"
   build_runner:
     dependency: "direct dev"
     description:
@@ -91,7 +91,7 @@ packages:
       name: build_web_compilers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,7 +105,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.6.0"
+    version: "6.7.0"
   charcode:
     dependency: transitive
     description:
@@ -167,7 +167,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -176,7 +176,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -186,7 +186,7 @@ packages:
       name: front_end
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.19"
+    version: "0.1.20"
   glob:
     dependency: transitive
     description:
@@ -263,7 +263,7 @@ packages:
       name: kernel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.3.20"
   logging:
     dependency: transitive
     description:
@@ -333,7 +333,7 @@ packages:
       name: protobuf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.14"
+    version: "0.13.15"
   pub_semver:
     dependency: transitive
     description:
@@ -452,14 +452,14 @@ packages:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
diff --git a/web/gallery/pubspec.lock b/web/gallery/pubspec.lock
index 79a361b4c..7dae9b553 100644
--- a/web/gallery/pubspec.lock
+++ b/web/gallery/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.37.0"
   archive:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   bazel_worker:
     dependency: transitive
     description:
@@ -49,7 +49,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.4"
+    version: "1.1.5"
   build_config:
     dependency: transitive
     description:
@@ -70,14 +70,14 @@ packages:
       name: build_modules
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.0.6"
   build_runner:
     dependency: "direct dev"
     description:
@@ -98,7 +98,7 @@ packages:
       name: build_web_compilers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   built_collection:
     dependency: transitive
     description:
@@ -112,7 +112,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.6.0"
+    version: "6.7.0"
   charcode:
     dependency: transitive
     description:
@@ -174,7 +174,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -183,7 +183,7 @@ packages:
     description:
       path: "packages/flutter_web_test"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -192,7 +192,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -202,7 +202,7 @@ packages:
       name: front_end
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.19"
+    version: "0.1.20"
   glob:
     dependency: transitive
     description:
@@ -279,7 +279,7 @@ packages:
       name: kernel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.3.20"
   logging:
     dependency: transitive
     description:
@@ -363,7 +363,7 @@ packages:
       name: protobuf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.14"
+    version: "0.13.15"
   pub_semver:
     dependency: transitive
     description:
@@ -524,21 +524,21 @@ packages:
       name: vm_service_lib
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.21.0"
+    version: "3.22.2"
   watcher:
     dependency: transitive
     description:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
diff --git a/web/github_dataviz/pubspec.lock b/web/github_dataviz/pubspec.lock
index aaae1f891..87036476a 100644
--- a/web/github_dataviz/pubspec.lock
+++ b/web/github_dataviz/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.37.0"
   archive:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   bazel_worker:
     dependency: transitive
     description:
@@ -42,7 +42,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.4"
+    version: "1.1.5"
   build_config:
     dependency: transitive
     description:
@@ -63,14 +63,14 @@ packages:
       name: build_modules
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.0.6"
   build_runner:
     dependency: "direct dev"
     description:
@@ -91,7 +91,7 @@ packages:
       name: build_web_compilers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,7 +105,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.6.0"
+    version: "6.7.0"
   charcode:
     dependency: transitive
     description:
@@ -167,7 +167,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -176,7 +176,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -186,7 +186,7 @@ packages:
       name: front_end
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.19"
+    version: "0.1.20"
   glob:
     dependency: transitive
     description:
@@ -263,7 +263,7 @@ packages:
       name: kernel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.3.20"
   logging:
     dependency: transitive
     description:
@@ -333,7 +333,7 @@ packages:
       name: protobuf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.14"
+    version: "0.13.15"
   pub_semver:
     dependency: transitive
     description:
@@ -452,14 +452,14 @@ packages:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
diff --git a/web/particle_background/pubspec.lock b/web/particle_background/pubspec.lock
index 871156a81..d2f5c07ef 100644
--- a/web/particle_background/pubspec.lock
+++ b/web/particle_background/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.37.0"
   archive:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   bazel_worker:
     dependency: transitive
     description:
@@ -42,7 +42,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.4"
+    version: "1.1.5"
   build_config:
     dependency: transitive
     description:
@@ -63,14 +63,14 @@ packages:
       name: build_modules
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.0.6"
   build_runner:
     dependency: "direct dev"
     description:
@@ -91,7 +91,7 @@ packages:
       name: build_web_compilers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,7 +105,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.6.0"
+    version: "6.7.0"
   charcode:
     dependency: transitive
     description:
@@ -167,7 +167,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -176,7 +176,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -186,7 +186,7 @@ packages:
       name: front_end
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.19"
+    version: "0.1.20"
   glob:
     dependency: transitive
     description:
@@ -263,7 +263,7 @@ packages:
       name: kernel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.3.20"
   logging:
     dependency: transitive
     description:
@@ -333,7 +333,7 @@ packages:
       name: protobuf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.14"
+    version: "0.13.15"
   pub_semver:
     dependency: transitive
     description:
@@ -452,14 +452,14 @@ packages:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
diff --git a/web/slide_puzzle/pubspec.lock b/web/slide_puzzle/pubspec.lock
index c99b8860d..109407fed 100644
--- a/web/slide_puzzle/pubspec.lock
+++ b/web/slide_puzzle/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.37.0"
   archive:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   bazel_worker:
     dependency: transitive
     description:
@@ -42,7 +42,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.4"
+    version: "1.1.5"
   build_config:
     dependency: transitive
     description:
@@ -63,14 +63,14 @@ packages:
       name: build_modules
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.0.6"
   build_runner:
     dependency: "direct dev"
     description:
@@ -91,7 +91,7 @@ packages:
       name: build_web_compilers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,7 +105,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.6.0"
+    version: "6.7.0"
   charcode:
     dependency: transitive
     description:
@@ -167,7 +167,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -176,7 +176,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -186,7 +186,7 @@ packages:
       name: front_end
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.19"
+    version: "0.1.20"
   glob:
     dependency: transitive
     description:
@@ -263,7 +263,7 @@ packages:
       name: kernel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.3.20"
   logging:
     dependency: transitive
     description:
@@ -333,7 +333,7 @@ packages:
       name: protobuf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.14"
+    version: "0.13.15"
   provider:
     dependency: "direct main"
     description:
@@ -461,14 +461,14 @@ packages:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
diff --git a/web/spinning_square/pubspec.lock b/web/spinning_square/pubspec.lock
index aaae1f891..87036476a 100644
--- a/web/spinning_square/pubspec.lock
+++ b/web/spinning_square/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.37.0"
   archive:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   bazel_worker:
     dependency: transitive
     description:
@@ -42,7 +42,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.4"
+    version: "1.1.5"
   build_config:
     dependency: transitive
     description:
@@ -63,14 +63,14 @@ packages:
       name: build_modules
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.0.6"
   build_runner:
     dependency: "direct dev"
     description:
@@ -91,7 +91,7 @@ packages:
       name: build_web_compilers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,7 +105,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.6.0"
+    version: "6.7.0"
   charcode:
     dependency: transitive
     description:
@@ -167,7 +167,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -176,7 +176,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -186,7 +186,7 @@ packages:
       name: front_end
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.19"
+    version: "0.1.20"
   glob:
     dependency: transitive
     description:
@@ -263,7 +263,7 @@ packages:
       name: kernel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.3.20"
   logging:
     dependency: transitive
     description:
@@ -333,7 +333,7 @@ packages:
       name: protobuf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.14"
+    version: "0.13.15"
   pub_semver:
     dependency: transitive
     description:
@@ -452,14 +452,14 @@ packages:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
diff --git a/web/timeflow/pubspec.lock b/web/timeflow/pubspec.lock
index 871156a81..d2f5c07ef 100644
--- a/web/timeflow/pubspec.lock
+++ b/web/timeflow/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.37.0"
   archive:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   bazel_worker:
     dependency: transitive
     description:
@@ -42,7 +42,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.4"
+    version: "1.1.5"
   build_config:
     dependency: transitive
     description:
@@ -63,14 +63,14 @@ packages:
       name: build_modules
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.0.6"
   build_runner:
     dependency: "direct dev"
     description:
@@ -91,7 +91,7 @@ packages:
       name: build_web_compilers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,7 +105,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.6.0"
+    version: "6.7.0"
   charcode:
     dependency: transitive
     description:
@@ -167,7 +167,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -176,7 +176,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -186,7 +186,7 @@ packages:
       name: front_end
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.19"
+    version: "0.1.20"
   glob:
     dependency: transitive
     description:
@@ -263,7 +263,7 @@ packages:
       name: kernel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.3.20"
   logging:
     dependency: transitive
     description:
@@ -333,7 +333,7 @@ packages:
       name: protobuf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.14"
+    version: "0.13.15"
   pub_semver:
     dependency: transitive
     description:
@@ -452,14 +452,14 @@ packages:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description:
diff --git a/web/vision_challenge/pubspec.lock b/web/vision_challenge/pubspec.lock
index aaae1f891..87036476a 100644
--- a/web/vision_challenge/pubspec.lock
+++ b/web/vision_challenge/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.37.0"
   archive:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.3.0"
   bazel_worker:
     dependency: transitive
     description:
@@ -42,7 +42,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.4"
+    version: "1.1.5"
   build_config:
     dependency: transitive
     description:
@@ -63,14 +63,14 @@ packages:
       name: build_modules
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.0.6"
   build_runner:
     dependency: "direct dev"
     description:
@@ -91,7 +91,7 @@ packages:
       name: build_web_compilers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,7 +105,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.6.0"
+    version: "6.7.0"
   charcode:
     dependency: transitive
     description:
@@ -167,7 +167,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -176,7 +176,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "8d4c12a4e9b45f82b5cb862840ac47445e136f7b"
+      resolved-ref: "4520a11a3499ca4c487dddfbbf45e20644de0df8"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -186,7 +186,7 @@ packages:
       name: front_end
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.19"
+    version: "0.1.20"
   glob:
     dependency: transitive
     description:
@@ -263,7 +263,7 @@ packages:
       name: kernel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.3.20"
   logging:
     dependency: transitive
     description:
@@ -333,7 +333,7 @@ packages:
       name: protobuf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.14"
+    version: "0.13.15"
   pub_semver:
     dependency: transitive
     description:
@@ -452,14 +452,14 @@ packages:
       name: watcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.7+10"
+    version: "0.9.7+12"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.13"
+    version: "1.0.14"
   yaml:
     dependency: transitive
     description: