diff --git a/criterion.cabal b/criterion.cabal
--- a/criterion.cabal
+++ b/criterion.cabal
@@ -1,5 +1,5 @@
 name:           criterion
-version:        0.6.0.0
+version:        0.6.0.1
 synopsis:       Robust, reliable performance measurement and analysis
 license:        BSD3
 license-file:   LICENSE
@@ -62,7 +62,7 @@
     directory,
     filepath,
     hastache >= 0.1.5,
-    mtl,
+    mtl >= 2,
     mwc-random >= 0.8.0.3,
     parsec >= 3.1.0,
     statistics >= 0.10.0.0,