diff --git a/dist/simple-scrollspy.min.js b/dist/simple-scrollspy.min.js
index a0b4c93..3a6464f 100644
--- a/dist/simple-scrollspy.min.js
+++ b/dist/simple-scrollspy.min.js
@@ -1 +1 @@
-!function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?exports.scrollSpy=e():t.scrollSpy=e()}(window,function(){return function(t){var e={};function o(n){if(e[n])return e[n].exports;var s=e[n]={i:n,l:!1,exports:{}};return t[n].call(s.exports,s,s.exports,o),s.l=!0,s.exports}return o.m=t,o.c=e,o.d=function(t,e,n){o.o(t,e)||Object.defineProperty(t,e,{configurable:!1,enumerable:!0,get:n})},o.r=function(t){Object.defineProperty(t,"__esModule",{value:!0})},o.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return o.d(e,"a",e),e},o.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},o.p="",o(o.s=1)}([function(t,e,o){"use strict";o.r(e),o.d(e,"ScrollSpy",function(){return n});class n{constructor(t,e={}){if(!t)throw new Error("First argument is query selector to your navigation.");if("object"!=typeof e)throw new Error("Second argument must be instance of Object.");this.menuList=t instanceof HTMLElement?t:document.querySelector(t),this.options=Object.assign({},{sectionClass:".scrollspy",menuActiveTarget:"li > a",offset:0,hrefAttribute:"href",activeClass:"active"},e),this.sections=document.querySelectorAll(this.options.sectionClass)}onScroll(){const t=this.getSectionInView(),e=this.getMenuItemBySection(t);e&&(this.removeCurrentActive({ignore:e}),this.setActive(e))}getMenuItemBySection(t){if(!t)return;const e=t.getAttribute("id");return this.menuList.querySelector(`[${this.options.hrefAttribute}="#${e}"]`)}getSectionInView(){for(let t=0;t<this.sections.length;t++){const e=this.sections[t].offsetTop,o=e+this.sections[t].offsetHeight,n=(document.documentElement.scrollTop||document.body.scrollTop)+this.options.offset;if(n>e&&n<=o)return this.sections[t]}}setActive(t){t.classList.contains(this.options.activeClass)||t.classList.add(this.options.activeClass)}removeCurrentActive({ignore:t}){const{hrefAttribute:e,menuActiveTarget:o}=this.options,n=`${o}.active:not([${e}="${t.getAttribute(e)}"])`;this.menuList.querySelectorAll(n).forEach(t=>t.classList.remove(this.options.activeClass))}}},function(t,e,o){t.exports=((t,e={})=>{const{ScrollSpy:n}=o(0),s=new n(t,e);return window.onload=s.onScroll(),window.addEventListener("scroll",()=>s.onScroll()),s})}])});
\ No newline at end of file
+!function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?exports.scrollSpy=e():t.scrollSpy=e()}(window,(function(){return function(t){var e={};function o(n){if(e[n])return e[n].exports;var r=e[n]={i:n,l:!1,exports:{}};return t[n].call(r.exports,r,r.exports,o),r.l=!0,r.exports}return o.m=t,o.c=e,o.d=function(t,e,n){o.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:n})},o.r=function(t){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})},o.t=function(t,e){if(1&e&&(t=o(t)),8&e)return t;if(4&e&&"object"==typeof t&&t&&t.__esModule)return t;var n=Object.create(null);if(o.r(n),Object.defineProperty(n,"default",{enumerable:!0,value:t}),2&e&&"string"!=typeof t)for(var r in t)o.d(n,r,function(e){return t[e]}.bind(null,r));return n},o.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return o.d(e,"a",e),e},o.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},o.p="",o(o.s=0)}([function(t,e,o){t.exports=(t,e={})=>{const{ScrollSpy:n}=o(1),r=new n(t,e);return window.onload=r.onScroll(),window.addEventListener("scroll",()=>r.onScroll()),r}},function(t,e,o){"use strict";o.r(e),o.d(e,"ScrollSpy",(function(){return n}));class n{constructor(t,e={}){if(!t)throw new Error("First argument is query selector to your navigation.");if("object"!=typeof e)throw new Error("Second argument must be instance of Object.");this.menuList=t instanceof HTMLElement?t:document.querySelector(t),this.options=Object.assign({},{sectionClass:".scrollspy",menuActiveTarget:"li > a",offset:0,hrefAttribute:"href",activeClass:"active"},e),this.sections=document.querySelectorAll(this.options.sectionClass)}onScroll(){const t=this.getSectionInView(),e=this.getMenuItemBySection(t);e&&(this.removeCurrentActive({ignore:e}),this.setActive(e))}getMenuItemBySection(t){if(!t)return;const e=t.getAttribute("id");return this.menuList.querySelector(`[${this.options.hrefAttribute}="#${e}"]`)}getSectionInView(){for(let t=0;t<this.sections.length;t++){const e=this.sections[t].offsetTop,o=e+this.sections[t].offsetHeight,n=(document.documentElement.scrollTop||document.body.scrollTop)+this.options.offset;if(n>e&&n<=o)return this.sections[t]}}setActive(t){t.classList.contains(this.options.activeClass)||t.classList.add(this.options.activeClass)}removeCurrentActive({ignore:t}){const{hrefAttribute:e,menuActiveTarget:o}=this.options,n=`${o}.active:not([${e}="${t.getAttribute(e)}"])`;this.menuList.querySelectorAll(n).forEach(t=>t.classList.remove(this.options.activeClass))}}}])}));
\ No newline at end of file
diff --git a/package.json b/package.json
index 8404587..60d9c53 100644
--- a/package.json
+++ b/package.json
@@ -23,8 +23,8 @@
   },
   "homepage": "https://kimyvgy.github.io/simple-scrollspy/demo",
   "devDependencies": {
-    "uglifyjs-webpack-plugin": "^1.2.4",
+    "terser-webpack-plugin": "^2.3.1",
     "webpack": "^4.4.1",
-    "webpack-cli": "^2.0.13"
+    "webpack-cli": "^3.3.10"
   }
 }
diff --git a/webpack.config.js b/webpack.config.js
index 334dfc8..b4cf1d7 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,17 +1,18 @@
-const {resolve} = require('path')
-const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
+const { resolve } = require('path')
+const TerserPlugin = require('terser-webpack-plugin')
 
 module.exports = {
     entry: resolve(__dirname, 'src/index.js'),
+
     output: {
         path: resolve(__dirname, 'dist'),
         filename: 'simple-scrollspy.min.js',
         library: 'scrollSpy',
         libraryTarget: 'umd'
     },
-    plugins: [
-        new UglifyJsPlugin({
-            exclude: [/\.min\.js$/gi] // skip pre-minified libs
-        })
-    ]
+
+    optimization: {
+        minimize: true,
+        minimizer: [new TerserPlugin()],
+    },
 }