diff --git a/Gruntfile.js b/Gruntfile.js
index 4193f87..b35c795 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -6,6 +6,7 @@ module.exports = function(grunt) {
     watch: {
       options: {
         livereload: true,
+        spawn: false
       },
       css: {
         files: ['scss/*.scss'],
@@ -29,26 +30,27 @@ module.exports = function(grunt) {
         },
     },
     uglify: {
-        build: {
-          src: 'js/pushy.min.js',
-          dest: 'js/pushy.min.js'
+        dist: {
+          files: {
+              'js/pushy.min.js': 'js/pushy.min.js'
+          }
         }
     },
-    sass: {                              
-      dist: {                          
+    sass: {
+      dist: {
         options: {
-          style: 'expanded' //output style: nested, compact, compressed, expanded
+          outputStyle: 'expanded' //output style: nested, compact, compressed, expanded
         },
-        files: {                         
+        files: {
           'css/pushy.css': 'scss/pushy.scss', // 'destination': 'source'
           'css/demo.css': 'scss/demo.scss'
         }
       }
     }
   });
-  
+
   // Load grunt plugins
-  grunt.loadNpmTasks('grunt-contrib-sass');
+  grunt.loadNpmTasks('grunt-sass');
   grunt.loadNpmTasks('grunt-contrib-watch');
   grunt.loadNpmTasks('grunt-contrib-uglify');
   grunt.loadNpmTasks('grunt-contrib-concat');
diff --git a/README.md b/README.md
index 84ab600..4543af8 100644
--- a/README.md
+++ b/README.md
@@ -2,11 +2,11 @@
 
 Pushy is a responsive off-canvas navigation menu using CSS transforms & transitions. This project was inspired by the off-canvas navigation menu seen on [Medium](https://medium.com/).
 
-Pushy has been implemented on many sites, [check them out!](https://github.com/christophery/pushy#sites-using-pushy) Feel free to [let me know](http://www.twitter.com/cmyee) if you use Pushy in one of your websites.
+Pushy has been implemented on many sites, [check them out!](https://chrisyee.ca/pushy/#sites-using-pushy) Feel free to [let me know](http://www.twitter.com/cmyee) if you use Pushy in one of your websites.
 
 Pushy has been featured on the [Treehouse Show](https://teamtreehouse.com/library/episode-118-page-transitions-designing-for-thumbs-concise) and in a [book](https://books.google.ca/books?id=guZjBAAAQBAJ&pg=PA103&lpg=PA103&dq=christopheryee.ca/pushy&source=bl&ots=1x-sSNmTHD&sig=ACfU3U1sFn-MU9bs3ia1UU0d9aNga5rB6w&hl=en&sa=X&ved=2ahUKEwi5wfKP9tnhAhUJbKwKHdbfBXAQ6AEwBnoECAoQAQ#v=onepage&q&f=false)!
 
-[View Demo](https://chrisyee.ca/pushy) | [Sites using Pushy](https://github.com/christophery/pushy#sites-using-pushy)
+[View Demo](https://chrisyee.ca/pushy) | [Sites using Pushy](https://chrisyee.ca/pushy/#sites-using-pushy)
 
 ## Features
 
@@ -21,7 +21,7 @@ Pushy has been featured on the [Treehouse Show](https://teamtreehouse.com/librar
 
 ## Requirements
 
-- [jQuery 1.12+](http://jquery.com/)
+- [jQuery 3.x+](https://jquery.com/)
 
 ## Install
 
@@ -124,17 +124,19 @@ This data attribute accepts a CSS selector.
 </nav>
 ```
 
-### data-menu-btn-class
+### data-menu-btn-selector
 
-Use the `data-menu-btn-class` attribute to change the menu button CSS class for toggling the menu.
+Use the `data-menu-btn-selector` attribute to change the menu button CSS class for toggling the menu.
 
 By default Pushy will use `.menu-btn` to toggle the menu.
 
 This data attribute accepts a CSS selector.
 
+**Note:** In v1.4.0 this attribute was renamed from `data-menu-btn-class` to `data-menu-btn-selector`
+
 ```html
 <!-- Pushy Menu -->
-<nav class="pushy pushy-left" data-menu-btn-class=".my-menu-btn">
+<nav class="pushy pushy-left" data-menu-btn-selector=".my-menu-btn">
 	<!-- I've removed the inner markup for brevity -->
 </nav>
 
@@ -142,6 +144,18 @@ This data attribute accepts a CSS selector.
 <button class="my-menu-btn">Menu</button>
 ```
 
+### data-container-selector
+
+Use the `data-container-selector` attribute to using a custom `#container` selector.
+
+If you use a custom `#container` selector you'll need to update the necessary CSS in `pushy.scss`.
+
+This data attribute accepts a CSS selector.
+
+```
+<nav class="pushy pushy-right" data-container-selector="#custom-container">
+```
+
 ## Tips
 
 - Use the ```.push``` CSS class on HTML elements outside of the ```#container```.
@@ -229,105 +243,10 @@ html, body{
 | Firefox       | 
 | Safari (Mac)  |
 
-## Version History
-
-1.3.0
-
-- Added the `data-menu-btn-class` attribute [#131](https://github.com/christophery/pushy/issues/131)
-- Updated README.md with Development, NPM and Options sections.
-
-1.2.0
-
-- Added support for a 3rd level submenu [#129](https://github.com/christophery/pushy/pull/129)
-- Removed bower.json
-- Updated demo
-
-1.1.2
-
-- Fixed formatting issues in README.md
-- Added repository + license to package.json
-
-1.1.1
-
-- Published package to NPM.
-- Removed Bower support.
-- Updated demo & personal site links.
-
-1.1.0
-
-- Accessiblity (a11y) enhancements:
-   - Can access and use menu with keyboard navigation.
-   - Can use the escape key to close the menu when opened.
-   - Changed the empty submenu links to buttons.
-   - Added `data-focus` attribute to allow user to specify a link to focus on when menu is opened.
-   - Added `.pushy-content` element to menu structure (fixes visibility flickering).
-   - Changed `.menu-btn` div to button.
-
-- Removed some redundant CSS classes from `pushy.css`.
-- Removed `toggleSubmenuFallback` function, older browsers will use `toggleSubmenu` instead.
-- Fixed issue #88
-
-1.0.0
-
-- Added auto-collapsable submenus.
-- Added ```.pushy-right``` CSS class for right sided menu position.
-- Added SCSS files.
-- Added menu width SCSS variable.
-- Updated click event listeners.
-- Updated demo file.
-- Updated browser compatibility.
-- Removed unneeded CSS browser prefixes.
-- Consolidated menu state CSS classes.
-- Fixed brief menu visibility.
-
-0.9.2
-
-- Removed modernizr dependency.
-- Updated site overlay with color + smoother transition.
-- Cleaned up the CSS a bit.
-- Dropped support for IE 7 & 8.
-
-0.9.1
-
-- Added support for more menu items (with scroll bar).
-- Added the .push CSS class. This adds pushy support to additional HTML elements outside of the container div.
-- Fixed menu transition.
-- Tested in iOS 7.
-- Updated the demo file.
-
-0.9.0
-
-- Added a site overlay when Pushy is toggled
-- Fixed horizontal scroll bar issue on mobile devices
-- Disabled webkit tap highlight
-- Rejiggered the JS file
-- Updated to jQuery 1.10.1
-- Updated the demo file
-
-0.8.4
-
-- Fixed performance issue with mobile devices
-- Updated to jQuery 1.10
-- Updated the demo file
-- Updated the read me
 
 ## Sites using Pushy
 
-Pushy has been implemented on many sites in the wild, check them out:
-
-- [Lela Design](http://leladesign.hr/) by [@div3rDesign](https://twitter.com/div3rDesign)
-- [emota](http://www.emota.com) by [@YayRomina](https://twitter.com/YayRomina)
-- [Selby College](http://www.selby.ac.uk/) by [@welcomebrand](https://twitter.com/welcomebrand)
-- [Bentleys Estate and Lettings Agents](http://www.bentleysestateagents.co.uk/) by [@WolfHook](https://twitter.com/WolfHook)
-- [Firefox OS Devices](https://firefoxosdevices.org/) by [@s_hentzschel](https://twitter.com/s_hentzschel)
-- [FulcrumTech](http://www.fulcrumtech.net/) by [@maxlapides](https://twitter.com/maxlapides)
-- [The Black and Blue](http://www.theblackandblue.com/) by [@evanluzi](https://github.com/evanluzi)
-
-**Note:** You may have to resize your browser on some sites to see Pushy in action.
+Pushy has been implemented on many sites in the wild, [check them out!](https://chrisyee.ca/pushy/#sites-using-pushy)
 
 To add your site, tweet to me [@cmyee](https://twitter.com/cmyee).
 
-## Thanks to
-
-- [HTML5 Boilerplate](http://html5boilerplate.com/)
-- [jQuery](http://jquery.com/)
diff --git a/css/demo.css b/css/demo.css
index 57674c0..170f617 100644
--- a/css/demo.css
+++ b/css/demo.css
@@ -26,6 +26,7 @@ ul {
   cursor: pointer;
   border: 0px;
 }
+
 .menu-btn:hover {
   opacity: 0.6;
 }
@@ -50,5 +51,3 @@ ul {
   font-size: 0.8em;
   text-align: center;
 }
-
-/*# sourceMappingURL=demo.css.map */
diff --git a/css/pushy.css b/css/pushy.css
index 75884f1..84dcd88 100644
--- a/css/pushy.css
+++ b/css/pushy.css
@@ -1,4 +1,4 @@
-/*! Pushy - v1.3.0 - 2019-6-25
+/*! Pushy - v1.4.0 - 2020-12-28
 * Pushy is a responsive off-canvas navigation menu using CSS transforms & transitions.
 * https://github.com/christophery/pushy/
 * by Christopher Yee */
@@ -14,21 +14,26 @@
   -webkit-overflow-scrolling: touch;
   /* enables momentum scrolling in iOS overflow elements */
 }
+
 .pushy a {
   display: block;
   color: #b3b3b1;
   padding: 15px 30px;
   text-decoration: none;
 }
+
 .pushy a:hover {
   color: #FFF;
 }
+
 .pushy ul:first-child {
   margin-top: 10px;
 }
+
 .pushy.pushy-left {
   left: 0;
 }
+
 .pushy.pushy-right {
   right: 0;
 }
@@ -70,6 +75,7 @@
   -ms-transform: translate3d(0, 0, 0);
   transform: translate3d(0, 0, 0);
 }
+
 .pushy-open-left .pushy-content,
 .pushy-open-right .pushy-content {
   visibility: visible;
@@ -113,6 +119,7 @@
     opacity: 1;
   }
 }
+
 @-webkit-keyframes fade {
   0% {
     opacity: 0;
@@ -121,18 +128,22 @@
     opacity: 1;
   }
 }
+
 /* Submenu Appearance */
 .pushy-submenu {
   /* Submenu Buttons */
   /* Submenu Icon */
 }
+
 .pushy-submenu > ul {
   padding-left: 15px;
   transition: max-height 0.2s ease-in-out, visibility 0.2s ease-in-out;
 }
+
 .pushy-submenu > ul .pushy-link {
   transition: opacity 0.2s ease-in-out;
 }
+
 .pushy-submenu button {
   width: 100%;
   color: #b3b3b1;
@@ -141,13 +152,16 @@
   background: transparent;
   border: 0;
 }
+
 .pushy-submenu button:hover {
   color: #FFF;
 }
+
 .pushy-submenu > a,
 .pushy-submenu > button {
   position: relative;
 }
+
 .pushy-submenu > a::after,
 .pushy-submenu > button::after {
   content: '';
@@ -170,6 +184,7 @@
   overflow: hidden;
   visibility: hidden;
 }
+
 .pushy-submenu-closed .pushy-link {
   opacity: 0;
 }
@@ -177,18 +192,19 @@
 .pushy-submenu-open {
   /* Submenu Icon */
 }
+
 .pushy-submenu-open > ul {
   max-height: 1000px;
   visibility: visible;
 }
+
 .pushy-submenu-open .pushy-link {
   opacity: 1;
 }
+
 .pushy-submenu-open > a::after,
 .pushy-submenu-open > button::after {
   -webkit-transform: translateY(-50%) rotate(90deg);
   -ms-transform: translateY(-50%) rotate(90deg);
   transform: translateY(-50%) rotate(90deg);
 }
-
-/*# sourceMappingURL=pushy.css.map */
diff --git a/demo.html b/demo.html
index e89a81a..87a61ff 100644
--- a/demo.html
+++ b/demo.html
@@ -13,7 +13,7 @@
         <link rel="stylesheet" href="css/pushy.css">
 
         <!-- jQuery -->
-        <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
+        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
     </head>
     <body>
 
diff --git a/js/pushy.js b/js/pushy.js
index 9615830..607d8fb 100644
--- a/js/pushy.js
+++ b/js/pushy.js
@@ -1,4 +1,4 @@
-/*! Pushy - v1.3.0 - 2019-6-25
+/*! Pushy - v1.4.0 - 2020-12-28
 * Pushy is a responsive off-canvas navigation menu using CSS transforms & transitions.
 * https://github.com/christophery/pushy/
 * by Christopher Yee */
@@ -18,9 +18,9 @@
 		submenuOpenClass = 'pushy-submenu-open',
 		submenuClosedClass = 'pushy-submenu-closed';
 
-	//check if menu-btn-class data attribute exists
-	if( typeof pushy.data('menu-btn-class') !== 'undefined' ){
-		var menuBtnClass = pushy.data('menu-btn-class'); //take user defined menu button CSS class
+	//check if menu-btn-selector data attribute exists
+	if( typeof pushy.data('menu-btn-selector') !== 'undefined' ){
+		var menuBtnClass = pushy.data('menu-btn-selector'); //take user defined menu button CSS class
 	}else{
 		var menuBtnClass = '.menu-btn'; //set default menu button CSS class
 	}
@@ -37,10 +37,9 @@
         containerSelector = pushy.data('container-selector');
     }
     var container = $(containerSelector);
-		
 
 	//close menu w/ esc key
-	$(document).keyup(function(e) {
+	$(document).on('keyup', function(e) {
 		//check if esc key is pressed
 		if (e.keyCode == 27) {
 
@@ -55,7 +54,7 @@
 				
 				//focus on menu button after menu is closed
 				if(menuBtnFocus){
-					menuBtnFocus.focus();
+					menuBtnFocus.trigger('focus');
 				}
 				
 			}
@@ -74,7 +73,7 @@
 		//focus on link in menu after css transition ends
 		if(menuLinkFocus){
 			pushy.one('transitionend', function() {
-				menuLinkFocus.focus();
+				menuLinkFocus.trigger('focus');
 			});
 		}
 		
@@ -105,7 +104,7 @@
 
 		//focus on link in menu
 		if(menuLinkFocus){
-			menuLinkFocus.focus();
+			menuLinkFocus.trigger('focus');
 		}
 	}
 
diff --git a/js/pushy.min.js b/js/pushy.min.js
index 4a224aa..e09b8eb 100644
--- a/js/pushy.min.js
+++ b/js/pushy.min.js
@@ -1 +1 @@
-!function(a){function b(){g.hasClass(j)?h.toggleClass(k):h.toggleClass(l),n&&g.one("transitionend",function(){n.focus()})}function c(){g.hasClass(j)?h.removeClass(k):h.removeClass(l)}function d(){g.hasClass(j)?(h.addClass(k),g.animate({left:"0px"},o),x.animate({left:p},o),i.animate({left:p},o)):(h.addClass(l),g.animate({right:"0px"},o),x.animate({right:p},o),i.animate({right:p},o)),n&&n.focus()}function e(){g.hasClass(j)?(h.removeClass(k),g.animate({left:"-"+p},o),x.animate({left:"0px"},o),i.animate({left:"0px"},o)):(h.removeClass(l),g.animate({right:"-"+p},o),x.animate({right:"0px"},o),i.animate({right:"0px"},o))}function f(){a(q).addClass(s),a(q).on("click",function(b){var c=a(this);c.hasClass(s)?(c.siblings(q).addClass(s).removeClass(r),c.removeClass(s).addClass(r)):c.addClass(s).removeClass(r),b.stopPropagation()})}var g=a(".pushy"),h=a("body"),i=a(".push"),j="pushy-left",k="pushy-open-left",l="pushy-open-right",m=a(".site-overlay"),n=a(g.data("focus")),o=200,p=g.width()+"px",q=".pushy-submenu",r="pushy-submenu-open",s="pushy-submenu-closed";if(void 0!==g.data("menu-btn-class"))var t=g.data("menu-btn-class");else var t=".menu-btn";var u=a(t+", .pushy-link"),v=a(t),w="#container";void 0!==g.data("container-selector")&&(w=g.data("container-selector"));var x=a(w);a(document).keyup(function(a){27==a.keyCode&&(h.hasClass(k)||h.hasClass(l))&&(y?c():(e(),z=!1),v&&v.focus())});var y=function(){var a=document.createElement("p"),b=!1,c={webkitTransform:"-webkit-transform",OTransform:"-o-transform",msTransform:"-ms-transform",MozTransform:"-moz-transform",transform:"transform"};if(null!==document.body){document.body.insertBefore(a,null);for(var d in c)void 0!==a.style[d]&&(a.style[d]="translate3d(1px,1px,1px)",b=window.getComputedStyle(a).getPropertyValue(c[d]));return document.body.removeChild(a),void 0!==b&&b.length>0&&"none"!==b}return!1}();if(y)f(),u.on("click",function(){b()}),m.on("click",function(){b()});else{h.addClass("no-csstransforms3d"),g.hasClass(j)?g.css({left:"-"+p}):g.css({right:"-"+p}),x.css({"overflow-x":"hidden"});var z=!1;f(),u.on("click",function(){z?(e(),z=!1):(d(),z=!0)}),m.on("click",function(){z?(e(),z=!1):(d(),z=!0)})}}(jQuery);
\ No newline at end of file
+!function(a){function b(){g.hasClass(j)?h.toggleClass(k):h.toggleClass(l),n&&g.one("transitionend",function(){n.trigger("focus")})}function c(){g.hasClass(j)?h.removeClass(k):h.removeClass(l)}function d(){g.hasClass(j)?(h.addClass(k),g.animate({left:"0px"},o),x.animate({left:p},o),i.animate({left:p},o)):(h.addClass(l),g.animate({right:"0px"},o),x.animate({right:p},o),i.animate({right:p},o)),n&&n.trigger("focus")}function e(){g.hasClass(j)?(h.removeClass(k),g.animate({left:"-"+p},o),x.animate({left:"0px"},o),i.animate({left:"0px"},o)):(h.removeClass(l),g.animate({right:"-"+p},o),x.animate({right:"0px"},o),i.animate({right:"0px"},o))}function f(){a(q).addClass(s),a(q).on("click",function(b){var c=a(this);c.hasClass(s)?(c.siblings(q).addClass(s).removeClass(r),c.removeClass(s).addClass(r)):c.addClass(s).removeClass(r),b.stopPropagation()})}var g=a(".pushy"),h=a("body"),i=a(".push"),j="pushy-left",k="pushy-open-left",l="pushy-open-right",m=a(".site-overlay"),n=a(g.data("focus")),o=200,p=g.width()+"px",q=".pushy-submenu",r="pushy-submenu-open",s="pushy-submenu-closed";if("undefined"!=typeof g.data("menu-btn-selector"))var t=g.data("menu-btn-selector");else var t=".menu-btn";var u=a(t+", .pushy-link"),v=a(t),w="#container";"undefined"!=typeof g.data("container-selector")&&(w=g.data("container-selector"));var x=a(w);a(document).on("keyup",function(a){27==a.keyCode&&(h.hasClass(k)||h.hasClass(l))&&(y?c():(e(),z=!1),v&&v.trigger("focus"))});var y=function(){var a=document.createElement("p"),b=!1,c={webkitTransform:"-webkit-transform",OTransform:"-o-transform",msTransform:"-ms-transform",MozTransform:"-moz-transform",transform:"transform"};if(null!==document.body){document.body.insertBefore(a,null);for(var d in c)void 0!==a.style[d]&&(a.style[d]="translate3d(1px,1px,1px)",b=window.getComputedStyle(a).getPropertyValue(c[d]));return document.body.removeChild(a),void 0!==b&&b.length>0&&"none"!==b}return!1}();if(y)f(),u.on("click",function(){b()}),m.on("click",function(){b()});else{h.addClass("no-csstransforms3d"),g.hasClass(j)?g.css({left:"-"+p}):g.css({right:"-"+p}),x.css({"overflow-x":"hidden"});var z=!1;f(),u.on("click",function(){z?(e(),z=!1):(d(),z=!0)}),m.on("click",function(){z?(e(),z=!1):(d(),z=!0)})}}(jQuery);
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index b276c50..f640685 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,18 @@
       "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
       "dev": true
     },
+    "ajv": {
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
     "align-text": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
@@ -21,52 +33,212 @@
         "repeat-string": "^1.5.2"
       }
     },
-    "ansi-regex": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-0.2.1.tgz",
-      "integrity": "sha1-DY6UaWej2BQ/k+JOKYUl/BsiNfk=",
+    "amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
       "dev": true
     },
     "ansi-styles": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-1.0.0.tgz",
-      "integrity": "sha1-yxAt8cVvUSPquLZ817mAJ6AnkXg=",
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "requires": {
+        "color-convert": "^1.9.0"
+      }
+    },
+    "aproba": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
       "dev": true
     },
+    "are-we-there-yet": {
+      "version": "1.1.5",
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@@ -832,6 +2422,69 @@
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+      "requires": {
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+        "string-width": "^3.0.0",
+        "strip-ansi": "^5.0.0"
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+          "requires": {
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+          "requires": {
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+    "wrappy": {
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+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "y18n": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.1.tgz",
+      "integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==",
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+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
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       "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
@@ -842,15 +2495,32 @@
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+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
+          "integrity": "sha1-m7UwTS4LVmmLLHWLCKPqqdqlijk=",
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-      "integrity": "sha1-JAzNv9AgP6hCsTDe77FBQSLIzFA=",
+    "yargs-parser": {
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+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
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       "dev": true,
       "requires": {
-        "tape": "~0.2.2"
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
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+      "dependencies": {
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+          "dev": true
+        }
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   }
diff --git a/package.json b/package.json
index fa86da1..342db05 100644
--- a/package.json
+++ b/package.json
@@ -13,10 +13,10 @@
     "url": "https://github.com/christophery/pushy.git"
   },
   "devDependencies": {
-    "grunt": "~0.4.4",
-    "grunt-contrib-sass": "~0.9.2",
-    "grunt-contrib-watch": "~0.6.1",
-    "grunt-contrib-concat": "~0.4.0",
-    "grunt-contrib-uglify": "~0.4.0"
+    "grunt": "~1.0.1",
+    "grunt-sass": "^2.1.0",
+    "grunt-contrib-watch": "~1.0.0",
+    "grunt-contrib-concat": "~1.0.1",
+    "grunt-contrib-uglify": "~1.0.1"
   }
 }
diff --git a/scss/pushy.scss b/scss/pushy.scss
index b25e348..b93cfe2 100644
--- a/scss/pushy.scss
+++ b/scss/pushy.scss
@@ -1,4 +1,4 @@
-/*! Pushy - v1.3.0 - 2019-6-25
+/*! Pushy - v1.4.0 - 2020-12-28
 * Pushy is a responsive off-canvas navigation menu using CSS transforms & transitions.
 * https://github.com/christophery/pushy/
 * by Christopher Yee */