diff --git a/CHANGELOG.md b/CHANGELOG.md
index a861326..ae5c80d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,12 +6,17 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
-## [1.0.11] -  2020-01-29
+## [2.0.0] - WIP
+### Changed
+- Removed support of `Inflate` & `Deflate` instance create without `new`.
+- Upgrade build tools to modern ones.
+
+## [1.0.11] - 2020-01-29
 ### Fixed
 - Fix tests in node.js v12+, #179.
 
 
-## [1.0.10] -  2019-02-28
+## [1.0.10] - 2019-02-28
 ### Fixed
 - Fix minified version, #161.
 
@@ -139,6 +144,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - First release.
 
 
+[2.0.0]: https://github.com/nodeca/pako/compare/1.0.11...2.0.0
 [1.0.10]: https://github.com/nodeca/pako/compare/1.0.10...1.0.11
 [1.0.10]: https://github.com/nodeca/pako/compare/1.0.9...1.0.10
 [1.0.9]: https://github.com/nodeca/pako/compare/1.0.8...1.0.9
diff --git a/lib/deflate.js b/lib/deflate.js
index 07f437f..472eaa4 100644
--- a/lib/deflate.js
+++ b/lib/deflate.js
@@ -118,8 +118,6 @@ var Z_DEFLATED  = 8;
  * ```
  **/
 function Deflate(options) {
-  if (!(this instanceof Deflate)) return new Deflate(options);
-
   this.options = utils.assign({
     level: Z_DEFAULT_COMPRESSION,
     method: Z_DEFLATED,
diff --git a/lib/inflate.js b/lib/inflate.js
index 21bbc5b..3549a2f 100644
--- a/lib/inflate.js
+++ b/lib/inflate.js
@@ -91,8 +91,6 @@ var toString = Object.prototype.toString;
  * ```
  **/
 function Inflate(options) {
-  if (!(this instanceof Inflate)) return new Inflate(options);
-
   this.options = utils.assign({
     chunkSize: 16384,
     windowBits: 0,