diff --git a/CHANGELOG.md b/CHANGELOG.md
index 753a845d..1c74174f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,20 @@
-### 4.6.0 (February 25, 2018)
+### 5.0.0 (Unreleased)
+
+* Add `onInit` method that accepts a callback that will be invoked after init
+* Allow for api endpoints that do not end with a trailing slash
+* Sync with upstream ua-parser for user agent parsing
+* Upgrade rollup/babel dependencies
+
+## Breaking Changes
+* Drop JSON polyfill. This will break IE 7 and older. You can install your own JSON polyfill before loading amplitude.
+* Stop committing generated files to the master branch in the git repository (do not install amplitude from git).
+* Drop custom user agent parsing for symbian and blackberry
+
+### 4.7.0 (March 12, 2019)
+
+* Cherry-picked from 5.0.0: Add `onInit` method that accepts a callback that will be invoked after init
+
+### 4.6.0 (February 25, 2019)
 
 * Add support for unsetting utm params when a new session is created
 * Update dependencies to pass yarn audit
diff --git a/README.md b/README.md
index de019a48..e441d212 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Please see our [installation guide](https://amplitude.zendesk.com/hc/en-us/artic
 [![npm version](https://badge.fury.io/js/amplitude-js.svg)](https://badge.fury.io/js/amplitude-js)
 [![Bower version](https://badge.fury.io/bo/amplitude-js.svg)](https://badge.fury.io/bo/amplitude-js)
 
-[4.6.0 - Released on February 25, 2019](https://github.com/amplitude/Amplitude-JavaScript/releases/latest)
+[4.7.0 - Released on March 12, 2019](https://github.com/amplitude/Amplitude-JavaScript/releases/latest)
 
 
 # JavaScript SDK Reference #
diff --git a/amplitude-snippet.min.js b/amplitude-snippet.min.js
index 54e629f4..695e7a95 100644
--- a/amplitude-snippet.min.js
+++ b/amplitude-snippet.min.js
@@ -1,6 +1,6 @@
 (function(e,t){var n=e.amplitude||{_q:[],_iq:{}};var r=t.createElement("script")
 ;r.type="text/javascript";r.async=true
-;r.src="https://cdn.amplitude.com/libs/amplitude-4.6.0-min.gz.js"
+;r.src="https://cdn.amplitude.com/libs/amplitude-4.7.0-min.gz.js"
 ;r.onload=function(){if(e.amplitude.runQueuedFunctions){
 e.amplitude.runQueuedFunctions()}else{
 console.log("[Amplitude] Error: could not load SDK")}}
diff --git a/amplitude.js b/amplitude.js
index 3d9cd7d9..a0911aa4 100644
--- a/amplitude.js
+++ b/amplitude.js
@@ -3801,7 +3801,7 @@ var uuid = function uuid(a) {
     );
 };
 
-var version = '4.6.0';
+var version = '4.7.0';
 
 var getLanguage = function getLanguage() {
     return navigator && (navigator.languages && navigator.languages[0] || navigator.language || navigator.userLanguage) || undefined;
@@ -3871,6 +3871,7 @@ var AmplitudeClient = function AmplitudeClient(instanceName) {
   this._q = []; // queue for proxied functions before script load
   this._sending = false;
   this._updateScheduled = false;
+  this._onInit = [];
 
   // event meta data
   this._eventId = 0;
@@ -3983,6 +3984,10 @@ AmplitudeClient.prototype.init = function init(apiKey, opt_userId, opt_config, o
       opt_callback(this);
     }
   }
+
+  for (var _i = 0; _i < this._onInit.length; _i++) {
+    this._onInit[_i]();
+  }
 };
 
 /**
@@ -4118,6 +4123,14 @@ AmplitudeClient.prototype.isNewSession = function isNewSession() {
   return this._newSession;
 };
 
+/**
+ * Store callbacks to call after init
+ * @private
+ */
+AmplitudeClient.prototype.onInit = function (callback) {
+  this._onInit.push(callback);
+};
+
 /**
  * Returns the id of the current session.
  * @public
diff --git a/amplitude.min.js b/amplitude.min.js
index aa29dba1..248de96d 100644
--- a/amplitude.min.js
+++ b/amplitude.min.js
@@ -1 +1 @@
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):e.amplitude=t()}(this,function(){"use strict";var u="undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{};function e(e,t){return e(t={exports:{}},t.exports),t.exports}e(function(s,a){(function(){var M={function:!0,object:!0},e=M.object&&a&&!a.nodeType&&a,B=M[typeof window]&&window||this,t=e&&M.object&&s&&!s.nodeType&&"object"==typeof u&&u;function L(e,u){e||(e=B.Object()),u||(u=B.Object());var c=e.Number||B.Number,p=e.String||B.String,t=e.Object||B.Object,l=e.Date||B.Date,n=e.SyntaxError||B.SyntaxError,S=e.TypeError||B.TypeError,i=e.Math||B.Math,r=e.JSON||B.JSON;"object"==typeof r&&r&&(u.stringify=r.stringify,u.parse=r.parse);var O,E,N,o=t.prototype,x=o.toString,d=new 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De=function(e,t){for(var n=0;n<t._q.length;n++){var i=e[t._q[n][0]];"function"===q(i)&&i.apply(e,t._q[n].slice(1))}return e};Te.prototype.identify=function(e,t){if(this._apiKeySet("identify()"))if("object"===q(e)&&e.hasOwnProperty("_q")&&(e=De(new he,e)),e instanceof he){if(0<Object.keys(e.userPropertiesOperations).length)return this._logEvent(h,null,null,e.userPropertiesOperations,null,null,null,t);"function"===q(t)&&t(0,"No request sent",{reason:"No user property operations"})}else V.error("Invalid identify input type. Expected Identify object but saw "+q(e)),"function"===q(t)&&t(0,"No request sent",{reason:"Invalid identify input type"});else"function"===q(t)&&t(0,"No request sent",{reason:"API key is not set"})},Te.prototype.groupIdentify=function(e,t,n,i){var r,o,s;if(this._apiKeySet("groupIdentify()"))if(Z(e,"group_type","string")&&!$(e))if(null!=t)if("object"===q(n)&&n.hasOwnProperty("_q")&&(n=De(new he,n)),n instanceof he){if(0<Object.keys(n.userPropertiesOperations).length)return this._logEvent(g,null,null,null,(s=t,(o=e)in(r={})?Object.defineProperty(r,o,{value:s,enumerable:!0,configurable:!0,writable:!0}):r[o]=s,r),n.userPropertiesOperations,null,i);"function"===q(i)&&i(0,"No request sent",{reason:"No group property operations"})}else V.error("Invalid identify input type. Expected Identify object but saw "+q(n)),"function"===q(i)&&i(0,"No request sent",{reason:"Invalid identify input type"});else"function"===q(i)&&i(0,"No request sent",{reason:"Invalid group name"});else"function"===q(i)&&i(0,"No request sent",{reason:"Invalid group type"});else"function"===q(i)&&i(0,"No request sent",{reason:"API key is not set"})},Te.prototype.setVersionName=function(e){Z(e,"versionName","string")&&(this.options.versionName=e)},Te.prototype._logEvent=function(e,t,n,i,r,o,s,a){if(Pe(this),e)if(this.options.optOut)"function"===q(a)&&a(0,"No request sent",{reason:"optOut is set to true"});else try{var u;u=e===h||e===g?this.nextIdentifyId():this.nextEventId();var c=this.nextSequenceNumber(),p="number"===q(s)?s:(new Date).getTime();(!this._sessionId||!this._lastEventTime||p-this._lastEventTime>this.options.sessionTimeout)&&(this._sessionId=p),this._lastEventTime=p,qe(this),i=i||{};var l=P({},this._apiPropertiesTrackingOptions);n=P({},n||{},l),t=t||{},r=r||{},o=o||{};var d={device_id:this.options.deviceId,user_id:this.options.userId,timestamp:p,event_id:u,session_id:this._sessionId||-1,event_type:e,version_name:Me(this,"version_name")&&this.options.versionName||null,platform:Me(this,"platform")?this.options.platform:null,os_name:Me(this,"os_name")&&this._ua.browser.name||null,os_version:Me(this,"os_version")&&this._ua.browser.major||null,device_model:Me(this,"device_model")&&this._ua.os.name||null,language:Me(this,"language")?this.options.language:null,api_properties:n,event_properties:H(Y(t)),user_properties:H(Y(i)),uuid:xe(),library:{name:"amplitude-js",version:ke},sequence_number:c,groups:H(Q(r)),group_properties:H(Y(o)),user_agent:this._userAgent};return e===h||e===g?(this._unsentIdentifys.push(d),this._limitEventsQueued(this._unsentIdentifys)):(this._unsentEvents.push(d),this._limitEventsQueued(this._unsentEvents)),this.options.saveEvents&&this.saveEvents(),this._sendEventsIfReady(a)||"function"!==q(a)||a(0,"No request sent",{reason:"No events to send or upload queued"}),u}catch(e){V.error(e)}else"function"===q(a)&&a(0,"No request sent",{reason:"Missing eventType"})};var Me=function(e,t){return!!e.options.trackingOptions[t]},Be=function(e){for(var t=["city","country","dma","ip_address","region"],n={},i=0;i<t.length;i++){var r=t[i];Me(e,r)||(n[r]=!1)}return n};Te.prototype._limitEventsQueued=function(e){e.length>this.options.savedMaxCount&&e.splice(0,e.length-this.options.savedMaxCount)},Te.prototype.logEvent=function(e,t,n){return this.logEventWithTimestamp(e,t,null,n)},Te.prototype.logEventWithTimestamp=function(e,t,n,i){return this._apiKeySet("logEvent()")?Z(e,"eventType","string")?$(e)?("function"===q(i)&&i(0,"No request sent",{reason:"Missing eventType"}),-1):this._logEvent(e,t,null,null,null,null,n,i):("function"===q(i)&&i(0,"No request sent",{reason:"Invalid type for eventType"}),-1):("function"===q(i)&&i(0,"No request sent",{reason:"API key not set"}),-1)},Te.prototype.logEventWithGroups=function(e,t,n,i){return this._apiKeySet("logEventWithGroups()")?Z(e,"eventType","string")?this._logEvent(e,t,null,null,n,null,null,i):("function"===q(i)&&i(0,"No request sent",{reason:"Invalid type for eventType"}),-1):("function"===q(i)&&i(0,"No request sent",{reason:"API key not set"}),-1)};var Le=function(e){return!isNaN(parseFloat(e))&&isFinite(e)};Te.prototype.logRevenueV2=function(e){if(this._apiKeySet("logRevenueV2()"))if("object"===q(e)&&e.hasOwnProperty("_q")&&(e=De(new Ee,e)),e instanceof Ee){if(e&&e._isValidRevenue())return this.logEvent(i,e._toJSONObject())}else V.error("Invalid revenue input type. Expected Revenue object but saw "+q(e))},Te.prototype.logRevenue=function(e,t,n){return this._apiKeySet("logRevenue()")&&Le(e)&&(void 0===t||Le(t))?this._logEvent(i,{},{productId:n,special:"revenue_amount",quantity:t||1,price:e},null,null,null,null,null):-1},Te.prototype.removeEvents=function(e,t){Fe(this,"_unsentEvents",e),Fe(this,"_unsentIdentifys",t)};var Fe=function(e,t,n){if(!(n<0)){for(var i=[],r=0;r<e[t].length;r++)e[t][r].event_id>n&&i.push(e[t][r]);e[t]=i}};Te.prototype.sendEvents=function(n){if(this._apiKeySet("sendEvents()"))if(this.options.optOut)"function"===q(n)&&n(0,"No request sent",{reason:"optOut is set to true"});else if(0!==this._unsentCount())if(this._sending)"function"===q(n)&&n(0,"No request sent",{reason:"Request already in progress"});else{this._sending=!0;var e=(this.options.forceHttps?"https":"https:"===window.location.protocol?"https":"http")+"://"+this.options.apiEndpoint+"/",i=Math.min(this._unsentCount(),this.options.uploadBatchSize),t=this._mergeEventsAndIdentifys(i),r=t.maxEventId,o=t.maxIdentifyId,s=JSON.stringify(t.eventsToSend),a=(new Date).getTime(),u={client:this.options.apiKey,e:s,v:p,upload_time:a,checksum:ge(p+this.options.apiKey+s+a)},c=this;new Oe(e,u).send(function(e,t){c._sending=!1;try{200===e&&"success"===t?(c.removeEvents(r,o),c.options.saveEvents&&c.saveEvents(),c._sendEventsIfReady(n)||"function"!==q(n)||n(e,t)):413===e?(1===c.options.uploadBatchSize&&c.removeEvents(r,o),c.options.uploadBatchSize=Math.ceil(i/2),c.sendEvents(n)):"function"===q(n)&&n(e,t)}catch(e){}})}else"function"===q(n)&&n(0,"No request sent",{reason:"No events to send"});else"function"===q(n)&&n(0,"No request sent",{reason:"API key not set"})},Te.prototype._mergeEventsAndIdentifys=function(e){for(var t=[],n=0,i=-1,r=0,o=-1;t.length<e;){var s,a=r>=this._unsentIdentifys.length,u=n>=this._unsentEvents.length;if(u&&a){V.error("Merging Events and Identifys, less events and identifys than expected");break}a?i=(s=this._unsentEvents[n++]).event_id:u?o=(s=this._unsentIdentifys[r++]).event_id:!("sequence_number"in this._unsentEvents[n])||this._unsentEvents[n].sequence_number<this._unsentIdentifys[r].sequence_number?i=(s=this._unsentEvents[n++]).event_id:o=(s=this._unsentIdentifys[r++]).event_id,t.push(s)}return{eventsToSend:t,maxEventId:i,maxIdentifyId:o}},Te.prototype.setGlobalUserProperties=function(e){this.setUserProperties(e)},Te.prototype.__VERSION__=ke;var Ke=function(){this.options=P({},Ae),this._q=[],this._instances={}};Ke.prototype.Identify=he,Ke.prototype.Revenue=Ee,Ke.prototype.getInstance=function(e){e=$(e)?f:e.toLowerCase();var t=this._instances[e];return void 0===t&&(t=new Te(e),this._instances[e]=t),t},Ke.prototype.runQueuedFunctions=function(){for(var e=0;e<this._q.length;e++){var t=this[this._q[e][0]];"function"===q(t)&&t.apply(this,this._q[e].slice(1))}for(var n in this._q=[],this._instances)this._instances.hasOwnProperty(n)&&this._instances[n].runQueuedFunctions()},Ke.prototype.init=function(e,t,n,i){this.getInstance().init(e,t,n,function(e){this.options=e.options,"function"===q(i)&&i(e)}.bind(this))},Ke.prototype.isNewSession=function(){return this.getInstance().isNewSession()},Ke.prototype.getSessionId=function(){return this.getInstance().getSessionId()},Ke.prototype.nextEventId=function(){return this.getInstance().nextEventId()},Ke.prototype.nextIdentifyId=function(){return this.getInstance().nextIdentifyId()},Ke.prototype.nextSequenceNumber=function(){return this.getInstance().nextSequenceNumber()},Ke.prototype.saveEvents=function(){this.getInstance().saveEvents()},Ke.prototype.setDomain=function(e){this.getInstance().setDomain(e)},Ke.prototype.setUserId=function(e){this.getInstance().setUserId(e)},Ke.prototype.setGroup=function(e,t){this.getInstance().setGroup(e,t)},Ke.prototype.setOptOut=function(e){this.getInstance().setOptOut(e)},Ke.prototype.regenerateDeviceId=function(){this.getInstance().regenerateDeviceId()},Ke.prototype.setDeviceId=function(e){this.getInstance().setDeviceId(e)},Ke.prototype.setUserProperties=function(e){this.getInstance().setUserProperties(e)},Ke.prototype.clearUserProperties=function(){this.getInstance().clearUserProperties()},Ke.prototype.identify=function(e,t){this.getInstance().identify(e,t)},Ke.prototype.setVersionName=function(e){this.getInstance().setVersionName(e)},Ke.prototype.logEvent=function(e,t,n){return this.getInstance().logEvent(e,t,n)},Ke.prototype.logEventWithGroups=function(e,t,n,i){return this.getInstance().logEventWithGroups(e,t,n,i)},Ke.prototype.logRevenueV2=function(e){return this.getInstance().logRevenueV2(e)},Ke.prototype.logRevenue=function(e,t,n){return this.getInstance().logRevenue(e,t,n)},Ke.prototype.removeEvents=function(e,t){this.getInstance().removeEvents(e,t)},Ke.prototype.sendEvents=function(e){this.getInstance().sendEvents(e)},Ke.prototype.setGlobalUserProperties=function(e){this.getInstance().setUserProperties(e)},Ke.prototype.__VERSION__=ke;var ze=window.amplitude||{},Ge=new Ke;for(var Je in Ge._q=ze._q||[],ze._iq)ze._iq.hasOwnProperty(Je)&&(Ge.getInstance(Je)._q=ze._iq[Je]._q||[]);return Ge});
diff --git a/package.json b/package.json
index 51df7a06..6f30ca36 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "amplitude-js",
   "author": "Amplitude <support@amplitude.com>",
-  "version": "4.6.0",
+  "version": "4.7.0",
   "license": "MIT",
   "description": "Javascript library for Amplitude Analytics",
   "keywords": [
diff --git a/src/amplitude-client.js b/src/amplitude-client.js
index c3cb518e..c48e022a 100644
--- a/src/amplitude-client.js
+++ b/src/amplitude-client.js
@@ -31,6 +31,7 @@ var AmplitudeClient = function AmplitudeClient(instanceName) {
   this._q = []; // queue for proxied functions before script load
   this._sending = false;
   this._updateScheduled = false;
+  this._onInit = [];
 
   // event meta data
   this._eventId = 0;
@@ -149,6 +150,10 @@ AmplitudeClient.prototype.init = function init(apiKey, opt_userId, opt_config, o
       opt_callback(this);
     }
   }
+
+  for (let i = 0; i < this._onInit.length; i++) {
+    this._onInit[i]();
+  }
 };
 
 /**
@@ -285,6 +290,14 @@ AmplitudeClient.prototype.isNewSession = function isNewSession() {
   return this._newSession;
 };
 
+/**
+ * Store callbacks to call after init
+ * @private
+ */
+AmplitudeClient.prototype.onInit = function (callback) {
+  this._onInit.push(callback);
+};
+
 /**
  * Returns the id of the current session.
  * @public
diff --git a/src/amplitude-snippet.js b/src/amplitude-snippet.js
index 1702d408..2a092f88 100644
--- a/src/amplitude-snippet.js
+++ b/src/amplitude-snippet.js
@@ -3,7 +3,7 @@
   var as = document.createElement('script');
   as.type = 'text/javascript';
   as.async = true;
-  as.src = 'https://cdn.amplitude.com/libs/amplitude-4.6.0-min.gz.js';
+  as.src = 'https://cdn.amplitude.com/libs/amplitude-4.7.0-min.gz.js';
   as.onload = function() {if(window.amplitude.runQueuedFunctions) {window.amplitude.runQueuedFunctions();} else {console.log('[Amplitude] Error: could not load SDK');}};
   var s = document.getElementsByTagName('script')[0];
   s.parentNode.insertBefore(as, s);
diff --git a/src/version.js b/src/version.js
index 21421399..b0add3fb 100644
--- a/src/version.js
+++ b/src/version.js
@@ -1 +1 @@
-export default '4.6.0';
+export default '4.7.0';
diff --git a/test/amplitude-client.js b/test/amplitude-client.js
index 5720f05b..fa306a81 100644
--- a/test/amplitude-client.js
+++ b/test/amplitude-client.js
@@ -54,6 +54,17 @@ describe('AmplitudeClient', function() {
       assert.equal(new AmplitudeClient('$DEFAULT_INSTANCE')._instanceName, '$default_instance');
     });
 
+    it('should invoke onInit callbacks', function() {
+      let onInitCalled = false;
+      let onInit2Called = false;
+      amplitude.onInit(() => { onInitCalled = true; });
+      amplitude.onInit(() => { onInit2Called = true; });
+
+      amplitude.init(apiKey);
+      assert.ok(onInitCalled);
+      assert.ok(onInit2Called);
+    });
+
     it('fails on invalid apiKeys', function() {
       amplitude.init(null);
       assert.equal(amplitude.options.apiKey, undefined);