diff --git a/packages/at_contact/CHANGELOG.md b/packages/at_contact/CHANGELOG.md
index 1fa7de71..8f53849b 100644
--- a/packages/at_contact/CHANGELOG.md
+++ b/packages/at_contact/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 3.0.9
+- **chore**: Upgrade to at_commons new major version 4
 ## 3.0.8
 - **Build**: Fix lint warnings from Dart 3
 ## 3.0.7
diff --git a/packages/at_contact/lib/at_contact.dart b/packages/at_contact/lib/at_contact.dart
index 4cee6747..a90cfc3c 100644
--- a/packages/at_contact/lib/at_contact.dart
+++ b/packages/at_contact/lib/at_contact.dart
@@ -1,6 +1,3 @@
-/// Support for doing something awesome.
-///
-/// More dartdocs go here.
 library at_contact;
 
 export 'package:at_contact/src/at_contacts_impl.dart';
diff --git a/packages/at_contact/lib/src/at_contacts_impl.dart b/packages/at_contact/lib/src/at_contacts_impl.dart
index 1affc996..ca6788c1 100644
--- a/packages/at_contact/lib/src/at_contacts_impl.dart
+++ b/packages/at_contact/lib/src/at_contacts_impl.dart
@@ -146,12 +146,12 @@ class AtContactsImpl implements AtContactsLibrary {
             .toLowerCase();
     var scanList = await atClient!.getAtKeys(regex: regex);
     scanList.retainWhere((scanKeys) =>
-        !scanKeys.key!.contains(AppConstants.GROUPS_LIST_KEY_PREFIX));
+        !scanKeys.key.contains(AppConstants.GROUPS_LIST_KEY_PREFIX));
     if (scanList.isEmpty) {
       return contactList;
     }
     for (final key in scanList) {
-      var atsign = reduceKey(key.key!);
+      var atsign = reduceKey(key.key);
       var atKey = _formAtKeyFromScanKeys(key);
       AtContact? contact;
       try {
@@ -244,8 +244,7 @@ class AtContactsImpl implements AtContactsLibrary {
     var groupId = atGroup.groupId;
     var group = await getGroup(groupId);
     if (group == null) {
-      throw GroupNotExistsException(
-          'No Group exists with Id $groupId');
+      throw GroupNotExistsException('No Group exists with Id $groupId');
     }
     var atKey = _formKey(KeyType.group, key: atGroup.groupId!);
     //update atGroup
@@ -509,7 +508,7 @@ class AtContactsImpl implements AtContactsLibrary {
 
   ///Returns `true` if key doesn't contain library namespace.
   bool _isOldKey(AtKey atKey) {
-    return !atKey.key!.contains(AppConstants.LIBRARY_NAMESPACE);
+    return !atKey.key.contains(AppConstants.LIBRARY_NAMESPACE);
   }
 
   String reduceKey(String key) {
@@ -601,8 +600,8 @@ class AtContactsImpl implements AtContactsLibrary {
   ///appends namespace for new format keys from scan key
   AtKey _formAtKeyFromScanKeys(AtKey key) {
     var atKey = key;
-    atKey.key = key.key! + '.' + key.namespace!;
-    atKey.metadata!.namespaceAware = false;
+    atKey.key = key.key + '.' + key.namespace!;
+    atKey.metadata.namespaceAware = false;
     return atKey;
   }
 
diff --git a/packages/at_contact/pubspec.yaml b/packages/at_contact/pubspec.yaml
index 9ba6eb14..f45986fd 100644
--- a/packages/at_contact/pubspec.yaml
+++ b/packages/at_contact/pubspec.yaml
@@ -2,18 +2,18 @@ name: at_contact
 description: A Dart library for managing contact data that developers can use
   for their applications.
 documentation: https://docs.atsign.com/
-version: 3.0.8
+version: 3.0.9
 repository: https://github.com/atsign-foundation/at_libraries
 homepage: https://atsign.com
 environment:
   sdk: '>=2.12.0 <4.0.0'
 
 dependencies:
-  intl: ^0.17.0
-  at_client: ^3.0.27
-  at_commons: ^3.0.17
-  at_utils: ^3.0.10
-  uuid: ^3.0.4
+  intl: ^0.19.0
+  at_client: ^3.0.73
+  at_commons: ^4.0.0
+  at_utils: ^3.0.16
+  uuid: ^3.0.7
 
 dev_dependencies:
   lints: ^1.0.1