diff --git a/platform/firefox/install.rdf b/platform/firefox/install.rdf
index 4a1c13c44..008440096 100644
--- a/platform/firefox/install.rdf
+++ b/platform/firefox/install.rdf
@@ -39,7 +39,7 @@
             <r:Description>
                 <id>{{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}}</id>
                 <minVersion>2.21</minVersion>
-                <maxVersion>2.39.*</maxVersion>
+                <maxVersion>2.40.*</maxVersion>
             </r:Description>
         </targetApplication>