diff --git a/Control/Monad/Trans/Error.hs b/Control/Monad/Trans/Error.hs
--- a/Control/Monad/Trans/Error.hs
+++ b/Control/Monad/Trans/Error.hs
@@ -47,12 +47,20 @@
 import Control.Exception (IOException)
 import Control.Monad
 import Control.Monad.Fix
-import Control.Monad.Instances ()
-import System.IO
+#if !(MIN_VERSION_base(4,6,0))
+import Control.Monad.Instances ()  -- deprecated from base-4.6
+#endif
+import System.IO.Error
 
 instance MonadPlus IO where
     mzero       = ioError (userError "mzero")
-    m `mplus` n = m `catch` \_ -> n
+    m `mplus` n = m `catchIOError` \_ -> n
+
+#if !(MIN_VERSION_base(4,4,0))
+-- exported by System.IO.Error from base-4.4
+catchIOError :: IO a -> (IOError -> IO a) -> IO a
+catchIOError = catch
+#endif
 
 -- | An exception to be thrown.
 --
diff --git a/Control/Monad/Trans/Reader.hs b/Control/Monad/Trans/Reader.hs
--- a/Control/Monad/Trans/Reader.hs
+++ b/Control/Monad/Trans/Reader.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Control.Monad.Trans.Reader
@@ -43,7 +44,9 @@
 import Control.Applicative
 import Control.Monad
 import Control.Monad.Fix
-import Control.Monad.Instances ()
+#if !(MIN_VERSION_base(4,6,0))
+import Control.Monad.Instances ()  -- deprecated from base-4.6
+#endif
 
 -- | The parameterizable reader monad.
 --
diff --git a/transformers.cabal b/transformers.cabal
--- a/transformers.cabal
+++ b/transformers.cabal
@@ -1,5 +1,5 @@
 name:         transformers
-version:      0.2.2.0
+version:      0.2.2.1
 license:      BSD3
 license-file: LICENSE
 author:       Andy Gill, Ross Paterson