diff --git a/SoccerFun.cabal b/SoccerFun.cabal
--- a/SoccerFun.cabal
+++ b/SoccerFun.cabal
@@ -1,11 +1,11 @@
 Name:           SoccerFun
-Version:        0.4.3
+Version:        0.4.4
 Copyright:      (c) 2010, Jan Rochel
 License:        BSD3
 License-File:   LICENSE
 Author:         Jan Rochel
 Maintainer:     jan@rochel.info
-Stability:      experimental
+Stability:      beta
 Build-Type:     Simple
 Synopsis:       Football simulation framework for teaching functional programming
 Homepage:       http://www.cs.ru.nl/~peter88/SoccerFun/SoccerFun.html
@@ -29,8 +29,8 @@
     base >= 4 && < 4.3,
     base-unicode-symbols >= 0.2 && < 0.3,
     random >= 1.0 && < 1.1,
-    mtl >= 1.1 && < 1.2,
-    derive >= 2.3 && < 2.4,
+    mtl >= 1.1 && < 2.1,
+    derive >= 2.4 && < 2.5,
     binary >= 0.5 && < 0.6,
     plugins >= 1.5 && < 1.6,
     process >= 1.0 && < 1.1,