diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa72465a..e021a61b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# [v1.9.0-beta.1](https://github.com/TomokiMiyauci/fonction/compare/v1.8.1-beta.1...v1.9.0-beta.1) (2021-06-04)
+
+## ✨ New Features
+- [`d4d7080`](https://github.com/TomokiMiyauci/fonction/commit/d4d7080)   Add tap function and types of Arity1Fn (Issues: [`#80`](https://github.com/TomokiMiyauci/fonction/issues/80))
+
 # [v1.8.1-beta.1](https://github.com/TomokiMiyauci/fonction/compare/v1.8.0...v1.8.1-beta.1) (2021-06-03)
 
 ## 🐛 Bug Fixes
diff --git a/package.json b/package.json
index 187c4090..a5664af3 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "fonction",
   "description": "A modern practical functional library",
-  "version": "1.8.1-beta.1",
+  "version": "1.9.0-beta.1",
   "main": "dist/index.umd.js",
   "module": "dist/index.es.js",
   "types": "dist/index.es.d.ts",