diff --git a/Data/Generator.hs b/Data/Generator.hs
--- a/Data/Generator.hs
+++ b/Data/Generator.hs
@@ -58,7 +58,7 @@
 import Data.Map (Map)
 import Data.List.NonEmpty (NonEmpty)
 import qualified Data.List.NonEmpty as NonEmpty
-import Control.Parallel.Strategies (rseq, parMap)
+-- import Control.Parallel.Strategies (rseq, parMap)
 import Data.Foldable (fold,foldMap)
 import Data.Semigroup.Reducer
 
@@ -80,7 +80,8 @@
 
 instance Generator Lazy.ByteString where
   type Elem Lazy.ByteString = Word8
-  mapReduce f = fold . parMap rseq (mapReduce f) . Lazy.toChunks
+  -- mapReduce f = fold . parMap rseq (mapReduce f) . Lazy.toChunks
+  mapReduce f = fold . map (mapReduce f) . Lazy.toChunks
 
 instance Generator Text where
   type Elem Text = Char
@@ -170,7 +171,7 @@
 
 instance Generator (Char8 Lazy.ByteString) where
   type Elem (Char8 Lazy.ByteString) = Char
-  mapReduce f = fold . parMap rseq (mapReduce f . Char8) . Lazy8.toChunks . getChar8
+  mapReduce f = fold . map (mapReduce f . Char8) . Lazy8.toChunks . getChar8
 
 -- | Apply a 'Reducer' directly to the elements of a 'Generator'
 reduce :: (Generator c, Reducer (Elem c) m, Monoid m) => c -> m
diff --git a/reducers.cabal b/reducers.cabal
--- a/reducers.cabal
+++ b/reducers.cabal
@@ -1,6 +1,6 @@
 name:          reducers
 category:      Data, Math, Numerical, Semigroups
-version:       0.2
+version:       0.3
 license:       BSD3
 cabal-version: >= 1.6
 license-file:  LICENSE
@@ -17,28 +17,24 @@
   type: git
   location: git://github.com/ekmett/reducers.git
 
-flag DeriveDataTypeable
-  manual: False
-  default: True
-
 library
   build-depends:
     base                   >= 4        && < 5,
     array                  >= 0.3      && < 0.5,
     transformers           >= 0.2      && < 0.4,
     bytestring             >= 0.9.1    && < 0.10,
-    containers             >= 0.3      && < 0.5,
+    containers             >= 0.3      && < 0.6,
     fingertree             >= 0.0.1    && < 0.1,
     hashable               >= 1.1.2.1  && < 1.2,
     text                   >= 0.11.1.5 && < 0.12,
-    parallel               >= 3.2      && < 3.3,
     unordered-containers   >= 0.1.4    && < 0.3,
-    semigroups             >= 0.8.2    && < 0.9,
-    semigroupoids          >= 1.3      && < 1.4,
-    comonad                >= 1.1.1.3  && < 1.2,
-    pointed                >= 2.1      && < 2.2,
-    keys                   >= 2.1.3    && < 2.2
+    semigroups             >= 0.8.3.1  && < 0.9,
+    semigroupoids          >= 1.3.1.2  && < 1.4,
+    comonad                >= 1.1.1.5  && < 1.2,
+    pointed                >= 2.1.0.1  && < 2.2,
+    keys                   >= 2.1.3.1  && < 2.2
 
+--  parallel               >= 3.2      && < 3.3,
   exposed-modules:
     Data.Generator
     Data.Generator.Combinators
@@ -55,7 +51,7 @@
     Data.Semigroup.MonadPlus
     Data.Semigroup.Self
 
-  if flag(DeriveDataTypeable)
+  if impl(ghc)
     extensions: DeriveDataTypeable
     cpp-options: -DLANGUAGE_DeriveDataTypeable