diff --git a/lib/widgets/compose_box.dart b/lib/widgets/compose_box.dart
index b68c7c0350..c45dc0ed7a 100644
--- a/lib/widgets/compose_box.dart
+++ b/lib/widgets/compose_box.dart
@@ -764,7 +764,7 @@ class _SendButtonState extends State<_SendButton> {
         tooltip: zulipLocalizations.composeBoxSendTooltip,
         style: const ButtonStyle(
           // Match the height of the content input.
-          minimumSize: MaterialStatePropertyAll(Size.square(_sendButtonSize)),
+          minimumSize: WidgetStatePropertyAll(Size.square(_sendButtonSize)),
           // With the default of [MaterialTapTargetSize.padded], not just the
           // tap target but the visual button would get padded to 48px square.
           // It would be nice if the tap target extended invisibly out from the
diff --git a/pubspec.lock b/pubspec.lock
index e5b5f847b2..2f069a73a3 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -616,10 +616,10 @@ packages:
     dependency: "direct main"
     description:
       name: intl
-      sha256: "3bc132a9dbce73a7e4a21a17d06e1878839ffbf975568bc875c60537824b0c4d"
+      sha256: d6f56758b7d3014a48af9701c085700aac781a92a87a62b1333b46d8879661cf
       url: "https://pub.dev"
     source: hosted
-    version: "0.18.1"
+    version: "0.19.0"
   io:
     dependency: transitive
     description:
@@ -1197,10 +1197,10 @@ packages:
     dependency: transitive
     description:
       name: vm_service
-      sha256: a2662fb1f114f4296cf3f5a50786a2d888268d7776cf681aa17d660ffa23b246
+      sha256: a75f83f14ad81d5fe4b3319710b90dec37da0e22612326b696c9e1b8f34bbf48
       url: "https://pub.dev"
     source: hosted
-    version: "14.0.0"
+    version: "14.2.0"
   watcher:
     dependency: transitive
     description:
@@ -1282,5 +1282,5 @@ packages:
     source: hosted
     version: "3.1.2"
 sdks:
-  dart: ">=3.4.0-140.0.dev <4.0.0"
-  flutter: ">=3.20.0-7.0.pre.63"
+  dart: ">=3.4.0-256.0.dev <4.0.0"
+  flutter: ">=3.21.0-12.0.pre.26"
diff --git a/pubspec.yaml b/pubspec.yaml
index 8f81114cf9..3c85f33b44 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -24,8 +24,8 @@ environment:
   # that by the time we want to release, these will have become stable.
   # TODO: Before general release, switch to stable Flutter and Dart versions,
   #   or pin exact versions: https://github.com/zulip/zulip-flutter/issues/15
-  sdk: '>=3.4.0-140.0.dev <4.0.0'
-  flutter: '>=3.20.0-7.0.pre.63'
+  sdk: '>=3.4.0-256.0.dev <4.0.0'
+  flutter: '>=3.21.0-12.0.pre.26'
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions
@@ -54,7 +54,7 @@ dependencies:
   html: ^0.15.1
   http: ^1.0.0
   image_picker: ^1.0.0
-  intl: ^0.18.0
+  intl: ^0.19.0
   json_annotation: ^4.8.1
   package_info_plus: ^5.0.1
   path: ^1.8.3