diff --git a/changelog b/changelog
deleted file mode 100644
--- a/changelog
+++ /dev/null
@@ -1,29 +0,0 @@
-# Version 0.4.0
-
-* Backwards incompatible API. `compress` and `decompress` are now
-  functions of `Producer'`s as they need to perform actions at the
-  beginning and end of input. (Issue #3)
-
-# Version 0.3.1
-
-* Dependency upper bounds.
-
-
-# Version 0.3.0
-
-* Upgraded to work with pipes-4.0.0, creating a new backwards
-  incompatible API.
-
-* Generalize base `IO` monad to `MonadIO`.
-
-
-# Version 0.2.0.0
-
-* New backwards incompatible API.
-
-* Based on pipes-3.3 and zlib-bindings.
-
-
-# Up to version 0.1.0
-
-* Based on pipes-core and zlib-bindings.
diff --git a/changelog.md b/changelog.md
new file mode 100644
--- /dev/null
+++ b/changelog.md
@@ -0,0 +1,35 @@
+# Version 0.4.0.1
+
+* Bump upper bound dependency on `transformers`.
+
+
+# Version 0.4.0
+
+* Backwards incompatible API. `compress` and `decompress` are now
+  functions of `Producer'`s as they need to perform actions at the
+  beginning and end of input. (Issue #3)
+
+
+# Version 0.3.1
+
+* Dependency upper bounds.
+
+
+# Version 0.3.0
+
+* Upgraded to work with pipes-4.0.0, creating a new backwards
+  incompatible API.
+
+* Generalize base `IO` monad to `MonadIO`.
+
+
+# Version 0.2.0.0
+
+* New backwards incompatible API.
+
+* Based on pipes-3.3 and zlib-bindings.
+
+
+# Up to version 0.1.0
+
+* Based on pipes-core and zlib-bindings.
diff --git a/pipes-zlib.cabal b/pipes-zlib.cabal
--- a/pipes-zlib.cabal
+++ b/pipes-zlib.cabal
@@ -1,5 +1,5 @@
 name:               pipes-zlib
-version:            0.4.0
+version:            0.4.0.1
 license:            BSD3
 license-file:       LICENSE
 Copyright:          Copyright (c) Paolo Capriotti 2012,
@@ -14,7 +14,7 @@
 synopsis:           Zlib compression and decompression for Pipes streams
 description:        Zlib compression and decompression for Pipes streams
 cabal-version:      >=1.8
-extra-source-files: README.md PEOPLE changelog
+extra-source-files: README.md PEOPLE changelog.md
 
 source-repository head
     type: git
@@ -24,7 +24,7 @@
     hs-source-dirs:  src
     exposed-modules: Pipes.Zlib
     build-depends:   base             (>= 4.5 && < 5.0)
-                   , transformers     (>= 0.2 && < 0.4)
+                   , transformers     (>= 0.2 && < 0.5)
                    , pipes            (>= 4.0 && < 4.2)
                    , bytestring       (>= 0.9.2.1)
                    , zlib             (>= 0.5 && < 0.7)