diff --git a/.fvmrc b/.fvmrc
index c2783c6..8f59eb5 100644
--- a/.fvmrc
+++ b/.fvmrc
@@ -1,3 +1,3 @@
 {
-  "flutter": "3.27.4"
+  "flutter": "3.22.2"
 }
\ No newline at end of file
diff --git a/packages/flutter_timeline/pubspec.yaml b/packages/flutter_timeline/pubspec.yaml
index a152f39..11ca4fb 100644
--- a/packages/flutter_timeline/pubspec.yaml
+++ b/packages/flutter_timeline/pubspec.yaml
@@ -7,7 +7,8 @@ version: 5.1.0
 publish_to: https://forgejo.internal.iconica.nl/api/packages/internal/pub
 
 environment:
-  sdk: ">=3.1.3 <4.0.0"
+  sdk: ">=3.4.3 <4.0.0"
+  flutter: ^3.22.2
 
 dependencies:
   flutter:
@@ -19,10 +20,9 @@ dependencies:
   flutter_timeline_interface:
     hosted: https://forgejo.internal.iconica.nl/api/packages/internal/pub
     version: ^5.1.0
-  collection: any
+  collection: ^1.18.0
 
 dev_dependencies:
-  flutter_lints: ^2.0.0
   flutter_iconica_analysis:
     git:
       url: https://github.com/Iconica-Development/flutter_iconica_analysis
diff --git a/packages/flutter_timeline_firebase/lib/src/config/firebase_timeline_options.dart b/packages/flutter_timeline_firebase/lib/src/config/firebase_timeline_options.dart
index 03f32e3..6243417 100644
--- a/packages/flutter_timeline_firebase/lib/src/config/firebase_timeline_options.dart
+++ b/packages/flutter_timeline_firebase/lib/src/config/firebase_timeline_options.dart
@@ -2,9 +2,6 @@
 //
 // SPDX-License-Identifier: BSD-3-Clause
 
-import 'package:flutter/material.dart';
-
-@immutable
 class FirebaseTimelineOptions {
   const FirebaseTimelineOptions({
     this.usersCollectionName = 'users',
diff --git a/packages/flutter_timeline_firebase/lib/src/models/firebase_user_document.dart b/packages/flutter_timeline_firebase/lib/src/models/firebase_user_document.dart
index 19fe9c9..df55790 100644
--- a/packages/flutter_timeline_firebase/lib/src/models/firebase_user_document.dart
+++ b/packages/flutter_timeline_firebase/lib/src/models/firebase_user_document.dart
@@ -2,9 +2,6 @@
 //
 // SPDX-License-Identifier: BSD-3-Clause
 
-import 'package:flutter/material.dart';
-
-@immutable
 class FirebaseUserDocument {
   const FirebaseUserDocument({
     this.firstName,
diff --git a/packages/flutter_timeline_firebase/pubspec.yaml b/packages/flutter_timeline_firebase/pubspec.yaml
index d094194..94d958a 100644
--- a/packages/flutter_timeline_firebase/pubspec.yaml
+++ b/packages/flutter_timeline_firebase/pubspec.yaml
@@ -8,7 +8,8 @@ version: 5.1.0
 publish_to: https://forgejo.internal.iconica.nl/api/packages/internal/pub
 
 environment:
-  sdk: ">=3.1.3 <4.0.0"
+  sdk: ">=3.4.3 <4.0.0"
+  flutter: ^3.22.2
 
 dependencies:
   flutter:
@@ -23,7 +24,6 @@ dependencies:
     version: ^5.1.0
 
 dev_dependencies:
-  flutter_lints: ^2.0.0
   flutter_iconica_analysis:
     git:
       url: https://github.com/Iconica-Development/flutter_iconica_analysis
diff --git a/packages/flutter_timeline_interface/pubspec.yaml b/packages/flutter_timeline_interface/pubspec.yaml
index d1e82e5..7e59498 100644
--- a/packages/flutter_timeline_interface/pubspec.yaml
+++ b/packages/flutter_timeline_interface/pubspec.yaml
@@ -8,14 +8,13 @@ version: 5.1.0
 publish_to: https://forgejo.internal.iconica.nl/api/packages/internal/pub
 
 environment:
-  sdk: '>=3.1.3 <4.0.0'
+  sdk: '>=3.4.3 <4.0.0'
 
 dependencies:
   flutter:
     sdk: flutter
 
 dev_dependencies:
-  flutter_lints: ^2.0.0
   flutter_iconica_analysis:
     git:
       url: https://github.com/Iconica-Development/flutter_iconica_analysis
diff --git a/packages/flutter_timeline_view/pubspec.yaml b/packages/flutter_timeline_view/pubspec.yaml
index a0b4580..858dc11 100644
--- a/packages/flutter_timeline_view/pubspec.yaml
+++ b/packages/flutter_timeline_view/pubspec.yaml
@@ -8,15 +8,16 @@ version: 5.1.0
 publish_to: https://forgejo.internal.iconica.nl/api/packages/internal/pub
 
 environment:
-  sdk: ">=3.1.3 <4.0.0"
+  sdk: ">=3.4.3 <4.0.0"
+  flutter: ^3.22.2
 
 dependencies:
   flutter:
     sdk: flutter
-  intl: any
+  intl: ^0.19.0
   cached_network_image: ^3.2.2
   dotted_border: ^2.1.0
-  collection: any
+  collection: ^1.18.0
   flutter_svg: ^2.0.10+1
   flutter_timeline_interface:
     hosted: https://forgejo.internal.iconica.nl/api/packages/internal/pub
@@ -26,7 +27,6 @@ dependencies:
     version: ^4.0.0
 
 dev_dependencies:
-  flutter_lints: ^2.0.0
   flutter_iconica_analysis:
     git:
       url: https://github.com/Iconica-Development/flutter_iconica_analysis
diff --git a/pubspec.yaml b/pubspec.yaml
index e09c50f..28217c5 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,6 +5,6 @@
 name: flutter_timeline_workspace
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: '>=3.4.3 <4.0.0'
 dev_dependencies:
   melos: ^3.0.1