diff --git a/ChannelT.cabal b/ChannelT.cabal
--- a/ChannelT.cabal
+++ b/ChannelT.cabal
@@ -1,5 +1,5 @@
 name:                ChannelT
-version:             0.0.0.6
+version:             0.0.0.7
 synopsis:            Generalized stream processors
 description:         A mutual generalization of <https://hackage.haskell.org/package/pipes pipes> and <https://hackage.haskell.org/package/machines machines>; a library for exploring a particular corner of the design space of streaming IO (and other related tasks) in Haskell.
 license:             BSD3
@@ -24,6 +24,6 @@
   -- other-modules:
   build-depends:       base >= 4.8.2.0 && < 5
                      , mtl >= 2.2.1 && < 2.3
-                     , free >= 4.12.4 && < 6
+                     , free >= 5 && < 6
                      , transformers-base >= 0.4.4 && < 0.5
                      , mmorph >= 1.0.5 && < 1.2