Index: wp-includes/js/jquery/jquery-migrate.js
===================================================================
--- wp-includes/js/jquery/jquery-migrate.js	(revision 23447)
+++ wp-includes/js/jquery/jquery-migrate.js	(working copy)
@@ -1,10 +1,11 @@
 /*!
- * jQuery Migrate - v1.1.0 - 2013-01-31
+ * jQuery Migrate - v1.1.1 - 2013-02-16
  * https://github.com/jquery/jquery-migrate
  * Copyright 2005, 2013 jQuery Foundation, Inc. and other contributors; Licensed MIT
  */
 (function( jQuery, window, undefined ) {
-"use strict";
+// See http://bugs.jquery.com/ticket/13335
+// "use strict";
 
 
 var warnedAbout = {};
@@ -78,7 +79,7 @@
 }
 
 
-var attrFn = {},
+var attrFn = jQuery( "<input/>", { size: 1 } ).attr("size") && jQuery.attrFn,
 	oldAttr = jQuery.attr,
 	valueAttrGet = jQuery.attrHooks.value && jQuery.attrHooks.value.get ||
 		function() { return null; },
@@ -90,17 +91,20 @@
 	ruseDefault = /^(?:checked|selected)$/i;
 
 // jQuery.attrFn
-migrateWarnProp( jQuery, "attrFn", attrFn, "jQuery.attrFn is deprecated" );
+migrateWarnProp( jQuery, "attrFn", attrFn || {}, "jQuery.attrFn is deprecated" );
 
 jQuery.attr = function( elem, name, value, pass ) {
 	var lowerName = name.toLowerCase(),
 		nType = elem && elem.nodeType;
 
-	// Since pass is used internally, we only warn and shim for new jQuery
-	// versions where there isn't a pass arg in the formal params
-	if ( pass && oldAttr.length < 4 ) {
-		migrateWarn("jQuery.fn.attr( props, pass ) is deprecated");
-		if ( elem && !rnoAttrNodeType.test( nType ) && jQuery.isFunction( jQuery.fn[ name ] ) ) {
+	if ( pass ) {
+		// Since pass is used internally, we only warn for new jQuery
+		// versions where there isn't a pass arg in the formal params
+		if ( oldAttr.length < 4 ) {
+			migrateWarn("jQuery.fn.attr( props, pass ) is deprecated");
+		}
+		if ( elem && !rnoAttrNodeType.test( nType ) &&
+			(attrFn ? name in attrFn : jQuery.isFunction(jQuery.fn[name])) ) {
 			return jQuery( elem )[ name ]( value );
 		}
 	}
@@ -237,25 +241,28 @@
 	};
 };
 
-matched = jQuery.uaMatch( navigator.userAgent );
-browser = {};
+// Don't clobber any existing jQuery.browser in case it's different
+if ( !jQuery.browser ) {
+	matched = jQuery.uaMatch( navigator.userAgent );
+	browser = {};
 
-if ( matched.browser ) {
-	browser[ matched.browser ] = true;
-	browser.version = matched.version;
-}
+	if ( matched.browser ) {
+		browser[ matched.browser ] = true;
+		browser.version = matched.version;
+	}
 
-// Chrome is Webkit, but Webkit is also Safari.
-if ( browser.chrome ) {
-	browser.webkit = true;
-} else if ( browser.webkit ) {
-	browser.safari = true;
+	// Chrome is Webkit, but Webkit is also Safari.
+	if ( browser.chrome ) {
+		browser.webkit = true;
+	} else if ( browser.webkit ) {
+		browser.safari = true;
+	}
+
+	jQuery.browser = browser;
 }
 
-jQuery.browser = browser;
-
 // Warn if the code tries to get jQuery.browser
-migrateWarnProp( jQuery, "browser", browser, "jQuery.browser is deprecated" );
+migrateWarnProp( jQuery, "browser", jQuery.browser, "jQuery.browser is deprecated" );
 
 jQuery.sub = function() {
 	function jQuerySub( selector, context ) {
@@ -280,6 +287,14 @@
 };
 
 
+// Ensure that $.ajax gets the new parseJSON defined in core.js
+jQuery.ajaxSetup({
+	converters: {
+		"text json": jQuery.parseJSON
+	}
+});
+
+
 var oldFnData = jQuery.fn.data;
 
 jQuery.fn.data = function( name ) {
@@ -367,7 +382,7 @@
 	rajaxEvent = new RegExp( "\\b(?:" + ajaxEvents + ")\\b" ),
 	rhoverHack = /(?:^|\s)hover(\.\S+|)\b/,
 	hoverHack = function( events ) {
-		if ( typeof( events ) != "string" || jQuery.event.special.hover ) {
+		if ( typeof( events ) !== "string" || jQuery.event.special.hover ) {
 			return events;
 		}
 		if ( rhoverHack.test( events ) ) {
@@ -462,7 +477,7 @@
 
 // Turn global events into document-triggered events
 jQuery.event.trigger = function( event, data, elem, onlyHandlers  ){
-	if ( !elem & !rajaxEvent.test( event ) ) {
+	if ( !elem && !rajaxEvent.test( event ) ) {
 		migrateWarn( "Global events are undocumented and deprecated" );
 	}
 	return eventTrigger.call( this,  event, data, elem || document, onlyHandlers  );
@@ -493,4 +508,4 @@
 );
 
 
-})( jQuery, window );
\ No newline at end of file
+})( jQuery, window );
Index: wp-includes/script-loader.php
===================================================================
--- wp-includes/script-loader.php	(revision 23447)
+++ wp-includes/script-loader.php	(working copy)
@@ -132,7 +132,7 @@
 	// jQuery
 	$scripts->add( 'jquery', false, array( 'jquery-core', 'jquery-migrate' ) );
 	$scripts->add( 'jquery-core', '/wp-includes/js/jquery/jquery.js', array(), '1.9.1' );
-	$scripts->add( 'jquery-migrate', '/wp-includes/js/jquery/jquery-migrate.js', array(), '1.1.0' );
+	$scripts->add( 'jquery-migrate', '/wp-includes/js/jquery/jquery-migrate.js', array(), '1.1.1' );
 
 	// full jQuery UI
 	$scripts->add( 'jquery-ui-core', '/wp-includes/js/jquery/ui/jquery.ui.core.min.js', array('jquery'), '1.10.1', 1 );