diff --git a/gems/actionpack/6.0/actiondispatch.rbs b/gems/actionpack/6.0/actiondispatch.rbs
index 92f64415..784ecca3 100644
--- a/gems/actionpack/6.0/actiondispatch.rbs
+++ b/gems/actionpack/6.0/actiondispatch.rbs
@@ -227,3 +227,12 @@ module ActionDispatch
     end
   end
 end
+
+module ActionDispatch
+  module Http
+    module MimeNegotiation
+      class InvalidType < Mime::Type::InvalidMimeType
+      end
+    end
+  end
+end