diff --git a/pipes-rt.cabal b/pipes-rt.cabal
--- a/pipes-rt.cabal
+++ b/pipes-rt.cabal
@@ -1,5 +1,5 @@
 Name:               pipes-rt
-Version:            0.4.1
+Version:            0.4.2
 License:            BSD3
 License-File:       LICENSE
 Copyright:          (c) 2013 Greg Hale
@@ -24,7 +24,7 @@
   Hs-Source-Dirs: lib
   Build-Depends:
     base        (>= 4.2 && < 4.8)
-   ,pipes       (>= 4   && < 4.1)
+   ,pipes       (>= 4   && < 4.2)
    ,time        (>= 1.4 && < 1.5)
    ,mwc-random  (>= 0.13 && < 0.14)
   Exposed-Modules: