diff --git a/wp-admin/js/updates.js b/wp-admin/js/updates.js
index e76b51025d..9af24327ce 100644
--- a/wp-admin/js/updates.js
+++ b/wp-admin/js/updates.js
@@ -1,6 +1,6 @@
 window.wp = window.wp || {};
 
-(function( $, wp, pagenow, ajaxurl ) {
+(function( $, wp, pagenow ) {
 	wp.updates = {};
 
 	/**
@@ -122,45 +122,15 @@ window.wp = window.wp || {};
 		wp.updates.updateLock = true;
 
 		var data = {
-			'action':      'update-plugin',
 			'_ajax_nonce': wp.updates.ajaxNonce,
 			'plugin':      plugin,
 			'slug':        slug
 		};
 
-		$.ajax( {
-			type:      'post',
-			url:       ajaxurl,
-			data:      data,
-			complete:  wp.updates.updateRequestComplete
-		} );
-	};
-
-	/**
-	 * After an update attempt has completed, deal with the response.
-	 *
-	 * @since 4.2.0
-	 *
-	 * @param  {jqXHR} jqxhr The jQuery XMLHttpRequest for the request.
-	 */
-	wp.updates.updateRequestComplete = function( jqxhr ) {
-		wp.updates.updateLock = false;
-		if ( jqxhr.responseJSON && jqxhr.responseJSON.success ) {
-			wp.updates.updateSuccess( jqxhr.responseJSON );
-		} else {
-			var alertText = wp.updates.l10n.updateFailed;
-			if ( jqxhr.responseJSON && jqxhr.responseJSON.data && jqxhr.responseJSON.data.error ) {
-				 alertText += ': ' + jqxhr.responseJSON.data.error;
-			}
-			window.alert( alertText );
-			if ( jqxhr.responseJSON && jqxhr.responseJSON.data && jqxhr.responseJSON.data.slug ) {
-				wp.updates.updateError( jqxhr.responseJSON );
-			}
-		}
-		/**
-		 * Check the queue.
-		 */
-		wp.updates.queueChecker();
+		wp.ajax.post( 'update-plugin', data )
+			.done( wp.updates.updateSuccess )
+			.fail( wp.updates.updateError )
+			.always( wp.updates.updateAlways );
 	};
 
 	/**
@@ -173,11 +143,11 @@ window.wp = window.wp || {};
 	wp.updates.updateSuccess = function( response ) {
 		var $message;
 		if ( 'plugins' === pagenow || 'plugins-network' === pagenow ) {
-			$message = $( '#' + response.data.slug ).next().find( '.update-message' );
-			$( '#' + response.data.slug ).addClass( 'updated' ).removeClass( 'update' );
-			$( '#' + response.data.slug + '-update' ).addClass( 'updated' ).removeClass( 'update' );
+			$message = $( '#' + response.slug ).next().find( '.update-message' );
+			$( '#' + response.slug ).addClass( 'updated' ).removeClass( 'update' );
+			$( '#' + response.slug + '-update' ).addClass( 'updated' ).removeClass( 'update' );
 		} else if ( 'plugin-install' === pagenow ) {
-			$message = $( '.plugin-card-' + response.data.slug ).find( '.update-now' );
+			$message = $( '.plugin-card-' + response.slug ).find( '.update-now' );
 			$message.addClass( 'button-disabled' );
 		}
 
@@ -197,14 +167,25 @@ window.wp = window.wp || {};
 	wp.updates.updateError = function( response ) {
 		var $message;
 		if ( 'plugins' === pagenow || 'plugins-network' === pagenow ) {
-			$message = $( '#' + response.data.slug ).next().find( '.update-message' );
+			$message = $( '#' + response.slug ).next().find( '.update-message' );
 		} else if ( 'plugin-install' === pagenow ) {
-			$message = $( '.plugin-card-' + response.data.slug ).find( '.update-now' );
+			$message = $( '.plugin-card-' + response.slug ).find( '.update-now' );
 		}
 		$message.removeClass( 'updating-message' );
 		$message.text( wp.updates.l10n.updateFailed );
 	};
 
+	/**
+	 * After an update attempt has completed, check the queue.
+	 *
+	 * @since 4.2.0
+	 */
+	wp.updates.updateAlways = function() {
+		wp.updates.updateLock = false;
+		wp.updates.queueChecker();
+	};
+
+
 	/**
 	 * Send an Ajax request to the server to install a plugin.
 	 *
@@ -231,45 +212,14 @@ window.wp = window.wp || {};
 		wp.updates.updateLock = true;
 
 		var data = {
-			'action':      'install-plugin',
 			'_ajax_nonce': wp.updates.ajaxNonce,
 			'slug':        slug
 		};
 
-		$.ajax( {
-			type:     'post',
-			url:      ajaxurl,
-			data:     data,
-			complete: wp.updates.installRequestComplete
-		} );
-	};
-
-
-	/**
-	 * After an installation attempt has completed, deal with the response.
-	 *
-	 * @since 4.2.0
-	 *
-	 * @param {jqXHR} jqxhr The jQuery XMLHttpRequest for the request.
-	 */
-	wp.updates.installRequestComplete = function( jqxhr ) {
-		wp.updates.updateLock = false;
-		if ( jqxhr.responseJSON && jqxhr.responseJSON.success ) {
-			wp.updates.installSuccess( jqxhr.responseJSON );
-		} else {
-			var alertText = wp.updates.l10n.installFailed;
-			if ( jqxhr.responseJSON && jqxhr.responseJSON.data && jqxhr.responseJSON.data.error ) {
-				 alertText += ': ' + jqxhr.responseJSON.data.error;
-			}
-			window.alert( alertText );
-			if ( jqxhr.responseJSON && jqxhr.responseJSON.data && jqxhr.responseJSON.data.slug ) {
-				wp.updates.installError( jqxhr.responseJSON );
-			}
-		}
-		/**
-		 * Check the queue.
-		 */
-		wp.updates.queueChecker();
+		wp.ajax.post( 'install-plugin', data )
+			.done( wp.updates.installSuccess )
+			.fail( wp.updates.installError )
+			.always( wp.updates.updateAlways );
 	};
 
 	/**
@@ -280,7 +230,7 @@ window.wp = window.wp || {};
 	 * @param {object} response
 	 */
 	wp.updates.installSuccess = function( response ) {
-		var $message = $( '.plugin-card-' + response.data.slug ).find( '.install-now' );
+		var $message = $( '.plugin-card-' + response.slug ).find( '.install-now' );
 
 		$message.removeClass( 'updating-message' ).addClass( 'updated-message button-disabled' );
 		$message.text( wp.updates.l10n.installed );
@@ -294,7 +244,7 @@ window.wp = window.wp || {};
 	 * @param {object} response
 	 */
 	wp.updates.installError = function( response ) {
-		var $message = $( '.plugin-card-' + response.data.slug ).find( '.install-now' );
+		var $message = $( '.plugin-card-' + response.slug ).find( '.install-now' );
 
 		$message.removeClass( 'updating-message' );
 		$message.text( wp.updates.l10n.installNow );
diff --git a/wp-admin/js/updates.min.js b/wp-admin/js/updates.min.js
index ea26260ee1..9635a80036 100644
--- a/wp-admin/js/updates.min.js
+++ b/wp-admin/js/updates.min.js
@@ -1 +1 @@
-window.wp=window.wp||{},function(a,b,c,d){b.updates={},b.updates.ajaxNonce=window._wpUpdatesSettings.ajax_nonce,b.updates.l10n=window._wpUpdatesSettings.l10n,b.updates.updateLock=!1,b.updates.updateQueue=[],b.updates.decrementCount=function(b){var c,d,e=a("#wp-admin-bar-updates .ab-label"),f=a('a[href="update-core.php"] .update-plugins'),g=a("#menu-plugins");if(c=e.text(),c=parseInt(c,10)-1,!(0>c||isNaN(c))&&(a("#wp-admin-bar-updates .ab-item").removeAttr("title"),e.text(c),f.each(function(a,b){b.className=b.className.replace(/count-\d+/,"count-"+c)}),f.removeAttr("title"),f.find(".update-count").text(c),"plugin"===b)){if(d=g.find(".plugin-count").eq(0).text(),d=parseInt(d,10)-1,0>d||isNaN(d))return;g.find(".plugin-count").text(d),g.find(".update-plugins").each(function(a,b){b.className=b.className.replace(/count-\d+/,"count-"+d)}),d>0?a(".subsubsub .upgrade .count").text("("+d+")"):a(".subsubsub .upgrade").remove()}},b.updates.updatePlugin=function(e,f){var g;if("plugins"===c||"plugins-network"===c?g=a("#"+f).next().find(".update-message"):"plugin-install"===c&&(g=a(".plugin-card-"+f).find(".update-now")),g.addClass("updating-message"),g.text(b.updates.l10n.updating),b.updates.updateLock)return void b.updates.updateQueue.push({type:"update-plugin",data:{plugin:e,slug:f}});b.updates.updateLock=!0;var h={action:"update-plugin",_ajax_nonce:b.updates.ajaxNonce,plugin:e,slug:f};a.ajax({type:"post",url:d,data:h,complete:b.updates.updateRequestComplete})},b.updates.updateRequestComplete=function(a){if(b.updates.updateLock=!1,a.responseJSON&&a.responseJSON.success)b.updates.updateSuccess(a.responseJSON);else{var c=b.updates.l10n.updateFailed;a.responseJSON&&a.responseJSON.data&&a.responseJSON.data.error&&(c+=": "+a.responseJSON.data.error),window.alert(c),a.responseJSON&&a.responseJSON.data&&a.responseJSON.data.slug&&b.updates.updateError(a.responseJSON)}b.updates.queueChecker()},b.updates.updateSuccess=function(d){var e;"plugins"===c||"plugins-network"===c?(e=a("#"+d.data.slug).next().find(".update-message"),a("#"+d.data.slug).addClass("updated").removeClass("update"),a("#"+d.data.slug+"-update").addClass("updated").removeClass("update")):"plugin-install"===c&&(e=a(".plugin-card-"+d.data.slug).find(".update-now"),e.addClass("button-disabled")),e.removeClass("updating-message").addClass("updated-message"),e.text(b.updates.l10n.updated),b.updates.decrementCount("plugin")},b.updates.updateError=function(d){var e;"plugins"===c||"plugins-network"===c?e=a("#"+d.data.slug).next().find(".update-message"):"plugin-install"===c&&(e=a(".plugin-card-"+d.data.slug).find(".update-now")),e.removeClass("updating-message"),e.text(b.updates.l10n.updateFailed)},b.updates.installPlugin=function(c){var e=a(".plugin-card-"+c).find(".install-now");if(e.addClass("updating-message"),e.text(b.updates.l10n.installing),b.updates.updateLock)return void b.updates.updateQueue.push({type:"install-plugin",data:{slug:c}});b.updates.updateLock=!0;var f={action:"install-plugin",_ajax_nonce:b.updates.ajaxNonce,slug:c};a.ajax({type:"post",url:d,data:f,complete:b.updates.installRequestComplete})},b.updates.installRequestComplete=function(a){if(b.updates.updateLock=!1,a.responseJSON&&a.responseJSON.success)b.updates.installSuccess(a.responseJSON);else{var c=b.updates.l10n.installFailed;a.responseJSON&&a.responseJSON.data&&a.responseJSON.data.error&&(c+=": "+a.responseJSON.data.error),window.alert(c),a.responseJSON&&a.responseJSON.data&&a.responseJSON.data.slug&&b.updates.installError(a.responseJSON)}b.updates.queueChecker()},b.updates.installSuccess=function(c){var d=a(".plugin-card-"+c.data.slug).find(".install-now");d.removeClass("updating-message").addClass("updated-message button-disabled"),d.text(b.updates.l10n.installed)},b.updates.installError=function(c){var d=a(".plugin-card-"+c.data.slug).find(".install-now");d.removeClass("updating-message"),d.text(b.updates.l10n.installNow)},b.updates.queueChecker=function(){if(!(b.updates.updateLock||b.updates.updateQueue.length<=0)){var a=b.updates.updateQueue.shift();switch(a.type){case"update-plugin":b.updates.updatePlugin(a.data.plugin,a.data.slug);break;case"install-plugin":b.updates.installPlugin(a.data.slug);break;default:window.console.log("Failed to exect queued update job."),window.console.log(a)}}},a(document).ready(function(){a(".plugin-update-tr .update-link").on("click",function(c){c.preventDefault();var d=a(c.target).parents(".plugin-update-tr");b.updates.updatePlugin(d.data("plugin"),d.data("slug"))}),a("#bulk-action-form").on("submit",function(c){var d,e,f;"update-selected"==a("#bulk-action-selector-top").val()&&(c.preventDefault(),a('input[name="checked[]"]:checked').each(function(c,g){d=a(g),e=d.val(),f=d.parents("tr").prop("id"),b.updates.updatePlugin(e,f),d.attr("checked",!1)}))}),a(".plugin-card .update-now").on("click",function(c){c.preventDefault();var d=a(c.target);b.updates.updatePlugin(d.data("plugin"),d.data("slug"))}),a(".plugin-card .install-now").on("click",function(c){c.preventDefault();var d=a(c.target);d.hasClass("button-disabled")||b.updates.installPlugin(d.data("slug"))})}),a(window).on("message",function(c){var d,e=c.originalEvent,f=document.location,g=f.protocol+"//"+f.hostname;e.origin===g&&(d=a.parseJSON(e.data),"undefined"!=typeof d.action&&"decrementUpdateCount"===d.action&&b.updates.decrementCount(d.upgradeType))})}(jQuery,window.wp,window.pagenow,window.ajaxurl);
\ No newline at end of file
+window.wp=window.wp||{},function(a,b,c){b.updates={},b.updates.ajaxNonce=window._wpUpdatesSettings.ajax_nonce,b.updates.l10n=window._wpUpdatesSettings.l10n,b.updates.updateLock=!1,b.updates.updateQueue=[],b.updates.decrementCount=function(b){var c,d,e=a("#wp-admin-bar-updates .ab-label"),f=a('a[href="update-core.php"] .update-plugins'),g=a("#menu-plugins");if(c=e.text(),c=parseInt(c,10)-1,!(0>c||isNaN(c))&&(a("#wp-admin-bar-updates .ab-item").removeAttr("title"),e.text(c),f.each(function(a,b){b.className=b.className.replace(/count-\d+/,"count-"+c)}),f.removeAttr("title"),f.find(".update-count").text(c),"plugin"===b)){if(d=g.find(".plugin-count").eq(0).text(),d=parseInt(d,10)-1,0>d||isNaN(d))return;g.find(".plugin-count").text(d),g.find(".update-plugins").each(function(a,b){b.className=b.className.replace(/count-\d+/,"count-"+d)}),d>0?a(".subsubsub .upgrade .count").text("("+d+")"):a(".subsubsub .upgrade").remove()}},b.updates.updatePlugin=function(d,e){var f;if("plugins"===c||"plugins-network"===c?f=a("#"+e).next().find(".update-message"):"plugin-install"===c&&(f=a(".plugin-card-"+e).find(".update-now")),f.addClass("updating-message"),f.text(b.updates.l10n.updating),b.updates.updateLock)return void b.updates.updateQueue.push({type:"update-plugin",data:{plugin:d,slug:e}});b.updates.updateLock=!0;var g={_ajax_nonce:b.updates.ajaxNonce,plugin:d,slug:e};b.ajax.post("update-plugin",g).done(b.updates.updateSuccess).fail(b.updates.updateError).always(b.updates.updateAlways)},b.updates.updateSuccess=function(d){var e;"plugins"===c||"plugins-network"===c?(e=a("#"+d.slug).next().find(".update-message"),a("#"+d.slug).addClass("updated").removeClass("update"),a("#"+d.slug+"-update").addClass("updated").removeClass("update")):"plugin-install"===c&&(e=a(".plugin-card-"+d.slug).find(".update-now"),e.addClass("button-disabled")),e.removeClass("updating-message").addClass("updated-message"),e.text(b.updates.l10n.updated),b.updates.decrementCount("plugin")},b.updates.updateError=function(d){var e;"plugins"===c||"plugins-network"===c?e=a("#"+d.slug).next().find(".update-message"):"plugin-install"===c&&(e=a(".plugin-card-"+d.slug).find(".update-now")),e.removeClass("updating-message"),e.text(b.updates.l10n.updateFailed)},b.updates.updateAlways=function(){b.updates.updateLock=!1,b.updates.queueChecker()},b.updates.installPlugin=function(c){var d=a(".plugin-card-"+c).find(".install-now");if(d.addClass("updating-message"),d.text(b.updates.l10n.installing),b.updates.updateLock)return void b.updates.updateQueue.push({type:"install-plugin",data:{slug:c}});b.updates.updateLock=!0;var e={_ajax_nonce:b.updates.ajaxNonce,slug:c};b.ajax.post("install-plugin",e).done(b.updates.installSuccess).fail(b.updates.installError).always(b.updates.updateAlways)},b.updates.installSuccess=function(c){var d=a(".plugin-card-"+c.slug).find(".install-now");d.removeClass("updating-message").addClass("updated-message button-disabled"),d.text(b.updates.l10n.installed)},b.updates.installError=function(c){var d=a(".plugin-card-"+c.slug).find(".install-now");d.removeClass("updating-message"),d.text(b.updates.l10n.installNow)},b.updates.queueChecker=function(){if(!(b.updates.updateLock||b.updates.updateQueue.length<=0)){var a=b.updates.updateQueue.shift();switch(a.type){case"update-plugin":b.updates.updatePlugin(a.data.plugin,a.data.slug);break;case"install-plugin":b.updates.installPlugin(a.data.slug);break;default:window.console.log("Failed to exect queued update job."),window.console.log(a)}}},a(document).ready(function(){a(".plugin-update-tr .update-link").on("click",function(c){c.preventDefault();var d=a(c.target).parents(".plugin-update-tr");b.updates.updatePlugin(d.data("plugin"),d.data("slug"))}),a("#bulk-action-form").on("submit",function(c){var d,e,f;"update-selected"==a("#bulk-action-selector-top").val()&&(c.preventDefault(),a('input[name="checked[]"]:checked').each(function(c,g){d=a(g),e=d.val(),f=d.parents("tr").prop("id"),b.updates.updatePlugin(e,f),d.attr("checked",!1)}))}),a(".plugin-card .update-now").on("click",function(c){c.preventDefault();var d=a(c.target);b.updates.updatePlugin(d.data("plugin"),d.data("slug"))}),a(".plugin-card .install-now").on("click",function(c){c.preventDefault();var d=a(c.target);d.hasClass("button-disabled")||b.updates.installPlugin(d.data("slug"))})}),a(window).on("message",function(c){var d,e=c.originalEvent,f=document.location,g=f.protocol+"//"+f.hostname;e.origin===g&&(d=a.parseJSON(e.data),"undefined"!=typeof d.action&&"decrementUpdateCount"===d.action&&b.updates.decrementCount(d.upgradeType))})}(jQuery,window.wp,window.pagenow,window.ajaxurl);
\ No newline at end of file
diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 8fb0b4c15a..88f1c41536 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -500,7 +500,7 @@ function wp_default_scripts( &$scripts ) {
 			'ays' => __('Are you sure you want to install this plugin?')
 		) );
 
-		$scripts->add( 'updates', "/wp-admin/js/updates$suffix.js", array( 'jquery' ) );
+		$scripts->add( 'updates', "/wp-admin/js/updates$suffix.js", array( 'jquery', 'wp-util' ) );
 		did_action( 'init' ) && $scripts->localize( 'updates', '_wpUpdatesSettings', array(
 			'ajax_nonce' => wp_create_nonce( 'updates' ),
 			'l10n'       => array(
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 61a3736518..1db36202ed 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31408';
+$wp_version = '4.2-alpha-31409';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.