diff --git a/example/pubspec.lock b/example/pubspec.lock
index a37a172..6fb4df3 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.5.0"
+    version: "2.8.2"
   boolean_selector:
     dependency: transitive
     description:
@@ -21,14 +21,14 @@ packages:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.1"
   clock:
     dependency: transitive
     description:
@@ -122,14 +122,21 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.10"
+    version: "0.12.11"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.3"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.7.0"
   path:
     dependency: transitive
     description:
@@ -211,7 +218,7 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.8.1"
   stack_trace:
     dependency: transitive
     description:
@@ -246,7 +253,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.19"
+    version: "0.4.8"
   timeline_tile:
     dependency: "direct main"
     description:
@@ -267,7 +274,7 @@ packages:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   win32:
     dependency: transitive
     description:
@@ -283,5 +290,5 @@ packages:
     source: hosted
     version: "0.2.0"
 sdks:
-  dart: ">=2.12.0 <3.0.0"
+  dart: ">=2.16.0 <3.0.0"
   flutter: ">=1.20.0"
diff --git a/lib/timeline_tile.dart b/lib/timeline_tile.dart
index ecf10fd..21221de 100644
--- a/lib/timeline_tile.dart
+++ b/lib/timeline_tile.dart
@@ -1,5 +1,5 @@
 library timeline_tile;
 
-export 'package:timeline_tile/src/tile.dart';
 export 'package:timeline_tile/src/style.dart';
+export 'package:timeline_tile/src/tile.dart';
 export 'package:timeline_tile/src/timeline_divider.dart';
diff --git a/pubspec.yaml b/pubspec.yaml
index e05aa86..9392451 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -6,7 +6,7 @@ homepage: https://github.com/JHBitencourt/timeline_tile
 issue_tracker: https://github.com/JHBitencourt/timeline_tile/issues
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.16.0 <3.0.0"
 
 dependencies:
   flutter: