diff --git a/README.md b/README.md
index c116324..7c64462 100644
--- a/README.md
+++ b/README.md
@@ -168,7 +168,7 @@ add this line to pubspec.yaml
 
 ```yaml
 dependencies:
-  dropdown_button2: ^3.0.0-beta.19
+  dropdown_button2: ^3.0.0-beta.20
 ```
 
 import package
diff --git a/packages/dropdown_button2/CHANGELOG.md b/packages/dropdown_button2/CHANGELOG.md
index 009495f..7337c4c 100644
--- a/packages/dropdown_button2/CHANGELOG.md
+++ b/packages/dropdown_button2/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 3.0.0-beta.20
+
+- Remove an assert from updateSelectedIndex method.
+- Update examples.
+
 ## 3.0.0-beta.19
 
 - Enhance the display of error/helper elements at DropdownButtonFormField2, closes #199.
diff --git a/packages/dropdown_button2/pubspec.yaml b/packages/dropdown_button2/pubspec.yaml
index 8fab3af..f89acb8 100644
--- a/packages/dropdown_button2/pubspec.yaml
+++ b/packages/dropdown_button2/pubspec.yaml
@@ -1,6 +1,6 @@
 name: dropdown_button2
 description: Flutter's core Dropdown Button widget with steady dropdown menu and many options you can customize to your needs.
-version: 3.0.0-beta.19
+version: 3.0.0-beta.20
 repository: https://github.com/AhmedLSayed9/dropdown_button2
 issue_tracker: https://github.com/AhmedLSayed9/dropdown_button2/issues