diff --git a/io-streams.cabal b/io-streams.cabal
--- a/io-streams.cabal
+++ b/io-streams.cabal
@@ -1,5 +1,5 @@
 Name:                io-streams
-Version:             1.1.4.3
+Version:             1.1.4.4
 License:             BSD3
 License-file:        LICENSE
 Category:            Data, Network, IO-Streams
@@ -81,6 +81,8 @@
   .
   /ChangeLog/
   .
+    [@1.1.4.4@] Allow use of transformers 0.4.*.
+  .
     [@1.1.4.3@] Allow use of new network version 2.5.
   .
     [@1.1.4.2@] Fixed a build error with network versions older than 2.4.
@@ -189,7 +191,7 @@
                      process       >= 1     && <1.3,
                      text          >= 0.10  && <1.2,
                      time          >= 1.2   && <1.5,
-                     transformers  >= 0.2   && <0.4,
+                     transformers  >= 0.2   && <0.5,
                      vector        >= 0.7   && <0.11,
                      zlib-bindings >= 0.1   && <0.2
 
@@ -273,7 +275,7 @@
                      process       >= 1     && <1.3,
                      text          >= 0.10  && <1.2,
                      time          >= 1.2   && <1.5,
-                     transformers  >= 0.2   && <0.4,
+                     transformers  >= 0.2   && <0.5,
                      vector        >= 0.7   && <0.11,
                      zlib-bindings >= 0.1   && <0.2,