diff --git a/platform/webext/install.rdf b/platform/webext/install.rdf
index b17945134..9b4c5b50a 100644
--- a/platform/webext/install.rdf
+++ b/platform/webext/install.rdf
@@ -29,7 +29,7 @@
         <em:targetApplication>
             <Description>
                 <em:id>{{aa3c5121-dab2-40e2-81ca-7ea25febc110}}</em:id>
-                <em:minVersion>56.0</em:minVersion>
+                <em:minVersion>56.0a1</em:minVersion>
                 <em:maxVersion>*</em:maxVersion>
             </Description>
         </em:targetApplication>