diff --git a/example/benchmark/benchmark_app/lib/screens/multi_benchmark_screen.dart b/example/benchmark/benchmark_app/lib/screens/multi_benchmark_screen.dart
index 716dd59d..49873215 100644
--- a/example/benchmark/benchmark_app/lib/screens/multi_benchmark_screen.dart
+++ b/example/benchmark/benchmark_app/lib/screens/multi_benchmark_screen.dart
@@ -2,8 +2,6 @@ import "package:benchmark_app/utils/benchmarks.dart";
 import "package:benchmark_app/widgets/release_mode_warning.dart";
 import "package:flutter/material.dart";
 
-
-
 class MultiBenchmarkScreen extends StatelessWidget {
   final Type collectionType;
 
@@ -35,8 +33,6 @@ class MultiBenchmarkScreen extends StatelessWidget {
     );
   }
 
-  
-
   List<Widget> get _benchmarks {
     switch (collectionType) {
       case List:
@@ -50,5 +46,3 @@ class MultiBenchmarkScreen extends StatelessWidget {
     }
   }
 }
-
-
diff --git a/example/benchmark/benchmark_app/pubspec.yaml b/example/benchmark/benchmark_app/pubspec.yaml
index b6208729..8166d72b 100644
--- a/example/benchmark/benchmark_app/pubspec.yaml
+++ b/example/benchmark/benchmark_app/pubspec.yaml
@@ -5,7 +5,7 @@ version: 0.0.1
 
 environment:
   flutter: ">=2.0.0 <=3.0.0"
-  sdk: ">=2.14.0 <3.0.0"
+  sdk: '>=3.0.0 <4.0.0'
 
 flutter:
   uses-material-design: true
diff --git a/example/benchmark/pubspec.yaml b/example/benchmark/pubspec.yaml
index 31e9fc10..5abc2679 100644
--- a/example/benchmark/pubspec.yaml
+++ b/example/benchmark/pubspec.yaml
@@ -4,7 +4,7 @@ publish_to: "none"
 version: 0.0.1
 
 environment:
-  sdk: ">=2.14.0 <3.0.0"
+  sdk: '>=3.0.0 <4.0.0'
 
 dependencies:
   benchmark_harness: ^2.0.0
diff --git a/example/simple/pubspec.yaml b/example/simple/pubspec.yaml
index 94f1acec..72396697 100644
--- a/example/simple/pubspec.yaml
+++ b/example/simple/pubspec.yaml
@@ -3,7 +3,7 @@ version: 1.0.0
 publish_to: none
 
 environment:
-  sdk: ">=2.14.0 <3.0.0"
+  sdk: '>=3.0.0 <4.0.0'
 
 dependencies:
   fast_immutable_collections:
diff --git a/json_serializable_e2e_test/pubspec.yaml b/json_serializable_e2e_test/pubspec.yaml
index 28359ebe..117ff756 100644
--- a/json_serializable_e2e_test/pubspec.yaml
+++ b/json_serializable_e2e_test/pubspec.yaml
@@ -2,7 +2,7 @@ name: json_serializable_e2e_test
 description: e2e tests for fic/json_serializable
 
 environment:
-  sdk: '>=2.14.0 <3.0.0'
+  sdk: '>=3.0.0 <4.0.0'
 
 dependencies:
   fast_immutable_collections:
diff --git a/pubspec.yaml b/pubspec.yaml
index 3f2d1beb..0492d2ab 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 9.1.6
 homepage: https://github.com/marcglasberg/fast_immutable_collections
 
 environment:
-  sdk: '>=2.14.0 <3.0.0'
+  sdk: '>=3.0.0 <4.0.0'
 
 dependencies:
   collection: ^1.17.0