diff --git a/CHANGELOG.md b/CHANGELOG.md
index da13d8e..77f80a6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,18 @@
+## 1.20.0
+- ObserverController
+  - Add `observeIntervalForScrolling` to set the minimum amount of time to wait for firing observe callback during scrolling.
+- ObserverUtils
+  - Improve the logic of `isDisplayingSliverInViewport` method.
+- ScrollViewOnceObserveNotificationResult
+  - Add `observeViewportResultModel`.
+- ChatScrollObserver
+  - Add `ChatScrollObserverRefIndexType`.
+  - Add `refIndexType` to specify the role of `refItemIndex` and `refItemIndex`.
+- Slivers
+  - Add `SliverObserveContext`.
+- ObserveDisplayingChildModelMixin
+  - Add `visibleFraction` and `visibleMainAxisSize`.
+
 ## 1.19.1
 - ListViewObserver
   - Support `SliverVariedExtentList` in [74](https://github.com/fluttercandies/flutter_scrollview_observer/issues/74).
diff --git a/pubspec.yaml b/pubspec.yaml
index d3d5a5e..857e013 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: scrollview_observer
 description: A widget for observing data related to the child widgets being displayed in a ScrollView.
-version: 1.19.1
+version: 1.20.0
 homepage: https://github.com/fluttercandies/flutter_scrollview_observer
 
 environment: