diff --git a/pentadactyl/install.rdf b/pentadactyl/install.rdf
index d55b72ea..8832197a 100644
--- a/pentadactyl/install.rdf
+++ b/pentadactyl/install.rdf
@@ -32,7 +32,7 @@
             <Description
                 em:id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}"
                 em:minVersion="31.0"
-                em:maxVersion="39.*"/>
+                em:maxVersion="40.*"/>
         </em:targetApplication>
     </Description>
 </RDF>