diff --git a/dbscripts/xml/upgrade/2.3.5_update.xml b/dbscripts/xml/upgrade/2.3.5_update.xml
new file mode 100644
index 0000000..e7804a9
--- /dev/null
+++ b/dbscripts/xml/upgrade/2.3.5_update.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE data SYSTEM "../../../lib/pkp/dtd/xmlData.dtd">
+
+<!--
+  * 2.3.5_update.xml
+  *
+  * Copyright (c) 2003-2011 John Willinsky
+  * Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
+  *
+  * 2.3.5 database updates XML file.
+  -->
+<data>
+	<!-- Bug #6451: Check and purge incorrect publication date data -->
+	<!--
+	  - 1. Drop the NOT NULL constraint on pa.date_published. This is not
+	  -    reliably done by ADODB. 
+	  -->
+	<sql>
+		<query driver="mysql">ALTER TABLE published_articles CHANGE COLUMN date_published date_published DATETIME</query>
+		<query driver="postgres7">ALTER TABLE published_articles ALTER COLUMN date_published DROP NOT NULL</query>
+	</sql>
+
+	<!--
+	  - 2. Null out pa.date_published from entries where there is a duped
+	  -    editor decision entry. (See bug #6428.) Duplicate entries help
+	  -    us to identify submissions that were created via the QuickSubmit
+	  -    or Expedited Submission processes (i.e. the two cases where
+	  -    publication dates will be incorrect).
+	  -->
+	<sql>
+		<query driver="mysql">UPDATE published_articles pa, edit_decisions e1, edit_decisions e2, articles a SET pa.date_published = NULL WHERE pa.article_id = a.article_id AND e1.article_id = a.article_id AND e2.article_id = a.article_id AND e1.edit_decision_id <> e2.edit_decision_id AND e1.date_decided = e2.date_decided AND pa.date_published >= a.date_submitted</query>
+		<query driver="postgres7">UPDATE published_articles SET date_published = NULL WHERE article_id IN (SELECT DISTINCT a.article_id FROM articles a, published_articles pa, edit_decisions e1, edit_decisions e2 WHERE pa.article_id = a.article_id AND e1.article_id = a.article_id AND e2.article_id = a.article_id AND e1.edit_decision_id <> e2.edit_decision_id AND e1.date_decided = e2.date_decided AND pa.date_published >= a.date_submitted)</query>
+	</sql>
+</data>