diff --git a/lib/src/models/config/toolbar/simple_toolbar_configurations.dart b/lib/src/models/config/toolbar/simple_toolbar_configurations.dart
index c9f0ffeb..fd998651 100644
--- a/lib/src/models/config/toolbar/simple_toolbar_configurations.dart
+++ b/lib/src/models/config/toolbar/simple_toolbar_configurations.dart
@@ -43,7 +43,7 @@ export 'buttons/toggle_check_list_configurations.dart';
 export 'buttons/toggle_style_configurations.dart';
 
 /// The default size of the icon of a button.
-const double kDefaultIconSize = 18;
+const double kDefaultIconSize = 15;
 
 /// The default size for the toolbar (width, height)
 const double defaultToolbarSize = kDefaultIconSize * 2;
diff --git a/version.dart b/version.dart
index 44108adc..24b74937 100644
--- a/version.dart
+++ b/version.dart
@@ -1 +1 @@
-const version = '9.0.0';
+const version = '9.0.1-dev';