diff --git a/ircbot.cabal b/ircbot.cabal
--- a/ircbot.cabal
+++ b/ircbot.cabal
@@ -1,5 +1,5 @@
 Name:                ircbot
-Version:             0.5.0
+Version:             0.5.1
 Synopsis:            A library for writing irc bots
 Homepage:            http://patch-tag.com/r/stepcut/ircbot
 License:             BSD3
@@ -31,15 +31,15 @@
                        Network.IRC.Bot.Types
 
   Build-depends:  base       >= 4 && <5,
-                  containers == 0.4.*,
+                  containers >= 0.4 && < 0.6,
                   directory   < 1.2,
                   filepath   >= 1.2 && < 1.4,
                   irc        == 0.5.*,
-                  mtl        == 2.0.*,
+                  mtl        >= 2.0 && < 2.2,
                   network    == 2.3.*,
                   old-locale == 1.0.*,
                   parsec     == 3.1.*,
                   time       == 1.4.*,
                   unix       >= 2.4 && < 2.6,
                   random     == 1.0.*,
-                  stm        == 2.2.*
+                  stm        >= 2.2 && < 2.4