diff --git a/CHANGELOG.md b/CHANGELOG.md
index 687440b..936fdd7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,3 @@
-## 1.0.0
+## 0.0.1-nullsafety.0 - Dec 24, 2020
 
-- Initial version, created by Stagehand
+-   Initial version.
diff --git a/pubspec.yaml b/pubspec.yaml
index 984ffee..ccdcfd6 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,7 +1,10 @@
 name: rxdart_ext
 description: Some extension methods and classes built on top of RxDart.
-version: 0.0.1
+version: 0.0.1-nullsafety.0
+author: Petrus Nguyễn Thái Học <hoc081098@gmail.com>
 homepage: https://github.com/hoc081098/rxdart_ext.git
+repository: https://github.com/hoc081098/rxdart_ext.git
+issue_tracker: https://github.com/hoc081098/rxdart_ext/issues
 
 environment:
   sdk: '>=2.12.0-0 <3.0.0'
@@ -12,3 +15,4 @@ dependencies:
 dev_dependencies:
   pedantic: ^1.10.0-nullsafety.3
   test: ^1.16.0-nullsafety.12
+  collection: ^1.15.0-nullsafety.5