diff --git a/Setup.hs b/Setup.hs
deleted file mode 100644
--- a/Setup.hs
+++ /dev/null
@@ -1,2 +0,0 @@
-import Distribution.Simple
-main = defaultMain
diff --git a/cassava-conduit.cabal b/cassava-conduit.cabal
--- a/cassava-conduit.cabal
+++ b/cassava-conduit.cabal
@@ -1,5 +1,5 @@
 name:               cassava-conduit
-version:            0.6.2
+version:            0.6.3
 license:            BSD3
 license-file:       etc/LICENCE.md
 author:             Dom De Re
@@ -36,7 +36,7 @@
                     ,   bytestring              == 0.11.*
                     ,   cassava                 == 0.5.*
                     ,   conduit                 == 1.3.*
-                    ,   mtl                     == 2.2.*
+                    ,   mtl                     >= 2.2.1 && < 2.4
                     ,   text                    == 1.2.* || >=2.0 && <2.1
 
     ghc-options:        -Wall