diff --git a/docs/THIRDPARTY b/docs/THIRDPARTY
index 59e8d3bd2b..9585a1e3be 100644
--- a/docs/THIRDPARTY
+++ b/docs/THIRDPARTY
@@ -150,10 +150,6 @@ Copyright: 2011-2013 Henrique Boaventura
 License: Expat
 Comment: The software has been modified.
 
-Files: static/third/jquery-mousewheel/jquery.mousewheel.js
-Copyright: 2011 Brandon Aaron
-License: Expat
-
 Files: static/third/jquery-perfect-scrollbar/*
 Copyright: 2012 HyeonJe Jun
 License: Expat
diff --git a/package.json b/package.json
index e783fb5972..38ff19a6bf 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
     "i18next-browser-languagedetector": "0.3.0",
     "i18next-localstorage-cache": "0.3.0",
     "jquery": "1.12.1",
+    "jquery-mousewheel": "3.1.6",
     "jquery-validation": "1.15.1",
     "plotly.js": "1.19.2",
     "string.prototype.codepointat": "0.2.0",
diff --git a/static/js/ui.js b/static/js/ui.js
index a1ea6fc320..caf801d36b 100644
--- a/static/js/ui.js
+++ b/static/js/ui.js
@@ -384,7 +384,7 @@ $(function () {
         viewport.last_movement_direction = delta;
     });
 
-    viewport.message_pane.mousewheel(function (e, delta) {
+    viewport.message_pane.mousewheel(function (e) {
         // Ignore mousewheel events if a modal is visible.  It's weird if the
         // user can scroll the main view by wheeling over the grayed-out area.
         // Similarly, ignore events on settings page etc.
@@ -393,7 +393,7 @@ $(function () {
         // select the compose box and then wheel over the message stream.
         var obscured = exports.home_tab_obscured();
         if (!obscured) {
-            throttled_mousewheelhandler(e, delta);
+            throttled_mousewheelhandler(e, e.deltaY);
         } else if (obscured === 'modal') {
             // The modal itself has a handler invoked before this one (see below).
             // preventDefault here so that the tab behind the modal doesn't scroll.
@@ -413,7 +413,7 @@ $(function () {
     // propagation in all cases.  Also, ignore the event if the
     // element is already at the top or bottom.  Otherwise we get a
     // new scroll event on the parent (?).
-    $('.modal-body, .scrolling_list, input, textarea').mousewheel(function (e, delta) {
+    $('.modal-body, .scrolling_list, input, textarea').mousewheel(function (e) {
         var self = $(this);
         var scroll = self.scrollTop();
 
@@ -422,8 +422,8 @@ $(function () {
         var max_scroll = this.scrollHeight - self.innerHeight() - 1;
 
         e.stopPropagation();
-        if (   ((delta > 0) && (scroll <= 0))
-            || ((delta < 0) && (scroll >= max_scroll))) {
+        if (   ((e.deltaY > 0) && (scroll <= 0))
+            || ((e.deltaY < 0) && (scroll >= max_scroll))) {
             e.preventDefault();
         }
     });
diff --git a/static/third/jquery-mousewheel/jquery.mousewheel.js b/static/third/jquery-mousewheel/jquery.mousewheel.js
deleted file mode 100755
index 38b60951b2..0000000000
--- a/static/third/jquery-mousewheel/jquery.mousewheel.js
+++ /dev/null
@@ -1,84 +0,0 @@
-/*! Copyright (c) 2011 Brandon Aaron (http://brandonaaron.net)
- * Licensed under the MIT License (LICENSE.txt).
- *
- * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
- * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
- * Thanks to: Seamus Leahy for adding deltaX and deltaY
- *
- * Version: 3.0.6
- * 
- * Requires: 1.2.2+
- */
-
-(function($) {
-
-var types = ['DOMMouseScroll', 'mousewheel'];
-
-if ($.event.fixHooks) {
-    for ( var i=types.length; i; ) {
-        $.event.fixHooks[ types[--i] ] = $.event.mouseHooks;
-    }
-}
-
-$.event.special.mousewheel = {
-    setup: function() {
-        if ( this.addEventListener ) {
-            for ( var i=types.length; i; ) {
-                this.addEventListener( types[--i], handler, false );
-            }
-        } else {
-            this.onmousewheel = handler;
-        }
-    },
-    
-    teardown: function() {
-        if ( this.removeEventListener ) {
-            for ( var i=types.length; i; ) {
-                this.removeEventListener( types[--i], handler, false );
-            }
-        } else {
-            this.onmousewheel = null;
-        }
-    }
-};
-
-$.fn.extend({
-    mousewheel: function(fn) {
-        return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
-    },
-    
-    unmousewheel: function(fn) {
-        return this.unbind("mousewheel", fn);
-    }
-});
-
-
-function handler(event) {
-    var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
-    event = $.event.fix(orgEvent);
-    event.type = "mousewheel";
-    
-    // Old school scrollwheel delta
-    if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta/120; }
-    if ( orgEvent.detail     ) { delta = -orgEvent.detail/3; }
-    
-    // New school multidimensional scroll (touchpads) deltas
-    deltaY = delta;
-    
-    // Gecko
-    if ( orgEvent.axis !== undefined && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
-        deltaY = 0;
-        deltaX = -1*delta;
-    }
-    
-    // Webkit
-    if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY/120; }
-    if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = -1*orgEvent.wheelDeltaX/120; }
-    
-    // Add event and delta to the front of the arguments
-    args.unshift(event, delta, deltaX, deltaY);
-    
-    return ($.event.dispatch || $.event.handle).apply(this, args);
-}
-
-})(jQuery);
diff --git a/version.py b/version.py
index 942d57573a..65de027ed0 100644
--- a/version.py
+++ b/version.py
@@ -1,2 +1,2 @@
 ZULIP_VERSION = "1.4.1+git"
-PROVISION_VERSION = '4.3'
+PROVISION_VERSION = '4.4'
diff --git a/zproject/settings.py b/zproject/settings.py
index 0c69c673f7..4eaa27aaac 100644
--- a/zproject/settings.py
+++ b/zproject/settings.py
@@ -760,7 +760,7 @@ JS_SPECS = {
             'third/jquery-filedrop/jquery.filedrop.js',
             'third/jquery-caret/jquery.caret.1.5.2.js',
             'node_modules/xdate/src/xdate.js',
-            'third/jquery-mousewheel/jquery.mousewheel.js',
+            'node_modules/jquery-mousewheel/jquery.mousewheel.js',
             'third/jquery-throttle-debounce/jquery.ba-throttle-debounce.js',
             'third/jquery-idle/jquery.idle.js',
             'third/jquery-autosize/jquery.autosize.js',