diff --git a/install.rdf b/install.rdf
index b18fefe8f..19ea2674c 100644
--- a/install.rdf
+++ b/install.rdf
@@ -18,7 +18,7 @@
     <em:optionsURL>chrome://zotero/content/preferences/preferences.xul</em:optionsURL>
     <em:aboutURL>chrome://zotero/content/about.xul</em:aboutURL>
     <em:iconURL>chrome://zotero/skin/zotero_z_32px.png</em:iconURL>
-    <em:updateURL>http://www.zotero.org/download/update-svn.rdf</em:updateURL>
+    <em:updateURL>https://www.zotero.org/download/update-svn.rdf</em:updateURL>
     <em:type>2</em:type> <!-- type=extension --> 
     
     <!-- Firefox -->
diff --git a/update.rdf b/update.rdf
index 26fedc076..89ac24a0f 100644
--- a/update.rdf
+++ b/update.rdf
@@ -14,6 +14,7 @@
               <minVersion>2.0</minVersion>
               <maxVersion>2.0.0.*</maxVersion>
               <updateLink>http://www.zotero.org/download/zotero.xpi</updateLink>
+              <updateHash>sha1:</updateHash>
             </RDF:Description>
           </targetApplication>
         </RDF:Description>