diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3d87f63..b80e4d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,7 @@
-* Added support for `extension` methods.
+## 3.6.0
+
+* Add support for creating `extension` methods.
+* Expand constraint on `built_value` to allow null safe migrated version.
 
 ## 3.5.0
 
diff --git a/pubspec.yaml b/pubspec.yaml
index abc1d67..8c8982d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: code_builder
-version: 3.5.0
+version: 3.6.0
 
 description: >-
   A fluent, builder-based library for generating valid Dart code
@@ -9,8 +9,8 @@ environment:
   sdk: '>=2.7.0 <3.0.0'
 
 dependencies:
-  built_collection: '>=3.0.0 <5.0.0'
-  built_value: ^7.0.0
+  built_collection: '>=3.0.0 <6.0.0'
+  built_value: '>=7.0.0 <9.0.0'
   collection: ^1.14.0
   matcher: ^0.12.0
   meta: ^1.0.5