diff --git a/Control/Workflow.hs b/Control/Workflow.hs
--- a/Control/Workflow.hs
+++ b/Control/Workflow.hs
@@ -9,6 +9,7 @@
             , DeriveDataTypeable
             , RecordWildCards
             , BangPatterns
+            , CPP
           #-}
 {-# OPTIONS -IControl/Workflow       #-}
 
@@ -158,7 +159,11 @@
 import System.IO.Unsafe
 import Control.Monad(when,liftM)
 import Control.Applicative
+#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 707
 import qualified Control.Exception as CE (Exception,AsyncException(ThreadKilled), SomeException, ErrorCall, throwIO, handle,finally,catch)
+#else
+import qualified Control.Exception as CE (Exception,AsyncException(ThreadKilled), SomeException, ErrorCall, throwIO, handle,finally,catch,block,unblock)
+#endif
 import Control.Concurrent -- (forkIO,threadDelay, ThreadId, myThreadId, killThread)
 import Control.Concurrent.STM
 import GHC.Conc(unsafeIOToSTM)
@@ -416,7 +421,7 @@
 -- It this case, the workflow just will return the last result.
 -- If the workflow was gathering data from user questions for a configuration, then this
 -- primitive will store them in the log the first time, and can be retrieve it the next time.
-exec1nc ::  (  Monad m, MonadIO m, CMC.MonadCatch m)
+exec1nc ::  (  Monad m, MonadIO m, CMC.MonadMask m)
           => String ->  Workflow m a ->   m  a
 exec1nc str f  =do
     v <- getState str f ()
diff --git a/Control/Workflow/Configuration.hs b/Control/Workflow/Configuration.hs
--- a/Control/Workflow/Configuration.hs
+++ b/Control/Workflow/Configuration.hs
@@ -29,7 +29,7 @@
 
 -- | executes a computation with `once` and `ever` statements
 -- a synonym of `exec1nc`
-runConfiguration :: (  Monad m, MonadIO m, CMC.MonadCatch m)
+runConfiguration :: (  Monad m, MonadIO m, CMC.MonadMask m)
                  => String ->  Workflow m a ->   m  a
 runConfiguration  = exec1nc
 
diff --git a/Control/Workflow/Patterns.hs b/Control/Workflow/Patterns.hs
--- a/Control/Workflow/Patterns.hs
+++ b/Control/Workflow/Patterns.hs
@@ -102,7 +102,7 @@
 split :: ( Typeable b
            , Serialize b
            , HasFork io
-           , CMC.MonadCatch io)
+           , CMC.MonadMask io)
           => [a -> Workflow io b] -> a  -> Workflow io [ActionWF b]
 split actions a = mapM (\ac ->
      do
@@ -161,7 +161,7 @@
 --         , Serialize [a]
          , Typeable a
          , HasFork io
-         , CMC.MonadCatch io)
+         , CMC.MonadMask io)
          => Integer
          -> (a ->   STM Select)
          -> [ActionWF a]
@@ -241,7 +241,7 @@
 --         , Serialize [b]
          , Typeable b
          , HasFork io
-         , CMC.MonadCatch io)
+         , CMC.MonadMask io)
       => Integer
       -> [a -> Workflow io  b]
       -> ([b] -> Workflow io c)
@@ -260,7 +260,7 @@
      , Typeable b
      , Monoid b
      , HasFork io
-     , CMC.MonadCatch io)
+     , CMC.MonadMask io)
      => Integer
      -> [a -> Workflow io b]
      -> a
diff --git a/Workflow.cabal b/Workflow.cabal
--- a/Workflow.cabal
+++ b/Workflow.cabal
@@ -1,5 +1,5 @@
 name: Workflow
-version: 0.8.0.9
+version: 0.8.1
 cabal-version: >= 1.6
 build-type: Simple
 license: BSD3
@@ -24,7 +24,7 @@
              See "Control.Workflow" for details
              .
              In this release:
-             * minor changes
+             * Adaptation for MonadMask instance introduced in the package exceptions-0.6
 
 category: Control, Workflow
 
@@ -38,10 +38,10 @@
 
 
 library
-    build-depends: exceptions -any, RefSerialize ==0.3.1.* ,
-                   TCache -any && <1.0, base >=4 && <5, binary -any, bytestring -any,
-                   containers -any, directory -any, extensible-exceptions -any,
-                    mtl -any, old-time -any, stm >2, vector -any
+    build-depends: exceptions >= 0.6, RefSerialize  ,
+                   TCache , base >=4 && <5, binary , bytestring ,
+                   containers , directory -any, extensible-exceptions ,
+                    mtl , old-time , stm >2, vector
 
     exposed-modules: Control.Workflow
                      Control.Workflow.Configuration