diff --git a/docs/docs_screenshots/pubspec.yaml b/docs/docs_screenshots/pubspec.yaml
index fe598cf967..224d1c77d7 100644
--- a/docs/docs_screenshots/pubspec.yaml
+++ b/docs/docs_screenshots/pubspec.yaml
@@ -22,7 +22,7 @@ dependencies:
   stream_core_flutter:
     git:
       url: https://github.com/GetStream/stream-core-flutter.git
-      ref: 333f7b72485f308b282cc85973223a2919fd8153
+      ref: 73ce5122a2f57e6106f35e95a2482bde0136a8e0
       path: packages/stream_core_flutter
 
 dev_dependencies:
diff --git a/melos.yaml b/melos.yaml
index 45ba63617d..c3d322d6ff 100644
--- a/melos.yaml
+++ b/melos.yaml
@@ -102,7 +102,7 @@ command:
       stream_core_flutter:
         git:
           url: https://github.com/GetStream/stream-core-flutter.git
-          ref: 333f7b72485f308b282cc85973223a2919fd8153
+          ref: 73ce5122a2f57e6106f35e95a2482bde0136a8e0
           path: packages/stream_core_flutter
       synchronized: ^3.4.0
       thumblr: ^0.0.4
diff --git a/packages/stream_chat_flutter/CHANGELOG.md b/packages/stream_chat_flutter/CHANGELOG.md
index e3e6453f60..9e0718ed70 100644
--- a/packages/stream_chat_flutter/CHANGELOG.md
+++ b/packages/stream_chat_flutter/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 🐞 Fixed
 
+- `StreamUserAvatar` with `StreamAvatarSize.xxl` now uses `StreamOnlineIndicatorSize.xxl` (20px) instead of `xl` (16px), matching the Chat SDK design system spec.
 - `StreamMessageComposer` no longer clobbers pre-populated composer state (text, quoted message, attachments) when the channel's draft stream emits its initial `null` (no draft on server). The reset now fires only on an actual non-null → null transition, distinguishing "no draft yet" from "draft was removed".
 
 ✅ Added
diff --git a/packages/stream_chat_flutter/lib/src/components/avatar/stream_user_avatar.dart b/packages/stream_chat_flutter/lib/src/components/avatar/stream_user_avatar.dart
index 251dcaf701..81ad91a98a 100644
--- a/packages/stream_chat_flutter/lib/src/components/avatar/stream_user_avatar.dart
+++ b/packages/stream_chat_flutter/lib/src/components/avatar/stream_user_avatar.dart
@@ -135,7 +135,8 @@ class StreamUserAvatar extends StatelessWidget {
     .xs || .sm => StreamOnlineIndicatorSize.sm,
     .md => StreamOnlineIndicatorSize.md,
     .lg => StreamOnlineIndicatorSize.lg,
-    .xl || .xxl => StreamOnlineIndicatorSize.xl,
+    .xl => StreamOnlineIndicatorSize.xl,
+    .xxl => StreamOnlineIndicatorSize.xxl,
   };
 }
 
diff --git a/packages/stream_chat_flutter/pubspec.yaml b/packages/stream_chat_flutter/pubspec.yaml
index feb5fbadf6..53b2dc6e57 100644
--- a/packages/stream_chat_flutter/pubspec.yaml
+++ b/packages/stream_chat_flutter/pubspec.yaml
@@ -62,7 +62,7 @@ dependencies:
   stream_core_flutter:
     git:
       url: https://github.com/GetStream/stream-core-flutter.git
-      ref: 333f7b72485f308b282cc85973223a2919fd8153
+      ref: 73ce5122a2f57e6106f35e95a2482bde0136a8e0
       path: packages/stream_core_flutter
   svg_icon_widget: ^0.0.1
   synchronized: ^3.4.0