diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77d6d3aa..9e32fcc8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# [5.4.2]
+* Upgrade i18n_extension.
+
 # [5.4.1]
 * Update German Translation. 
 
diff --git a/lib/src/widgets/editor.dart b/lib/src/widgets/editor.dart
index 3c5e2e9c..556f00eb 100644
--- a/lib/src/widgets/editor.dart
+++ b/lib/src/widgets/editor.dart
@@ -1608,8 +1608,7 @@ class RenderEditor extends RenderEditableContainerBox
   }
 }
 
-class QuillVerticalCaretMovementRun
-    extends BidirectionalIterator<TextPosition> {
+class QuillVerticalCaretMovementRun extends Iterator<TextPosition> {
   QuillVerticalCaretMovementRun._(
     this._editor,
     this._currentTextPosition,
@@ -1630,7 +1629,6 @@ class QuillVerticalCaretMovementRun
     return true;
   }
 
-  @override
   bool movePrevious() {
     _currentTextPosition = _editor.getTextPositionAbove(_currentTextPosition);
     return true;
diff --git a/pubspec.yaml b/pubspec.yaml
index a937e7af..6be94685 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: flutter_quill
 description: A rich text editor supporting mobile and web (Demo App @ bulletjournal.us)
-version: 5.4.1
+version: 5.4.2
 #author: bulletjournal
 homepage: https://bulletjournal.us/home/index.html
 repository: https://github.com/singerdmx/flutter-quill
@@ -21,7 +21,7 @@ dependencies:
   pedantic: ^1.11.1
   characters: ^1.2.0
   diff_match_patch: ^0.4.1
-  i18n_extension: ^5.0.0
+  i18n_extension: ^5.0.1
   device_info_plus: ^4.0.0
   platform: ^3.1.0