diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index f00c694..7a667dc 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -18,7 +18,7 @@ publish_to: "none" # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-    sdk: ">=2.7.0 <3.0.0"
+    sdk: ">=2.12.0"
 
 dependencies:
     flutter:
diff --git a/lib/rich_input.dart b/lib/rich_input.dart
index 24af3e1..5829587 100644
--- a/lib/rich_input.dart
+++ b/lib/rich_input.dart
@@ -31,7 +31,6 @@ class RichInput extends TextField {
     int minLines,
     bool expands = false,
     int maxLength,
-    bool maxLengthEnforced = true,
     void Function(String) onChanged,
     void Function() onEditingComplete,
     void Function(String) onSubmitted,
@@ -78,7 +77,6 @@ class RichInput extends TextField {
           minLines: minLines,
           expands: expands,
           maxLength: maxLength,
-          maxLengthEnforced: maxLengthEnforced,
           onChanged: onChanged,
           onEditingComplete: onEditingComplete,
           onSubmitted: onSubmitted,
diff --git a/pubspec.yaml b/pubspec.yaml
index 52f997e..a57681e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 1.2.1
 homepage: https://github.com/yungzhu/rich_input
 
 environment:
-    sdk: ">=2.7.0 <3.0.0"
+    sdk: ">=2.12.0"
 
 dependencies:
     flutter: