diff --git a/thunderbird.xml b/thunderbird.xml
index bcffdb27beb15acff0574d5e11746b64952db82d..06fe5b68ec820b7c9c7110f94f8a5bfb69a75f5f 100755
--- a/thunderbird.xml
+++ b/thunderbird.xml
@@ -7,8 +7,8 @@
 			 we add in chemistry-prefs.js. Thus, we tie that to a version, and please test carefully when
        upgrading -->
 
- <variable name="version" value="45.8.0" />
- <variable name="prefsversion" value="45" />
+ <variable name="version" value="52.0" />
+ <variable name="prefsversion" value="52" />
  <check type="uninstall" condition="exists" path="Mozilla Thunderbird %version%.*" />
 
   <install cmd='"%software%\thunderbird\Thunderbird Setup %version%.exe" -ms' />