diff --git a/crypto-random-effect.cabal b/crypto-random-effect.cabal
--- a/crypto-random-effect.cabal
+++ b/crypto-random-effect.cabal
@@ -2,7 +2,7 @@
 --  documentation, see http://haskell.org/cabal/users-guide/
 
 name:                crypto-random-effect
-version:             0.2.0.3
+version:             0.2.0.4
 synopsis:            A random effect using crypto-random
 description:         Any help (especially documentation) is welcome
 homepage:            https://github.com/ibotty/crypto-random-effect
@@ -22,7 +22,7 @@
   -- other-extensions:    
   build-depends:       base >=4.6 && <5
                      , bytestring <= 0.11
-                     , crypto-random >=0.0.7 && <0.1
+                     , crypto-random >=0.0.8 && <0.1
                      , extensible-effects ==1.4.* || ==1.7.*
                      , securemem ==0.1.*
                      , transformers >=0.3 && <0.5
diff --git a/src/Crypto/Random/Effect.hs b/src/Crypto/Random/Effect.hs
--- a/src/Crypto/Random/Effect.hs
+++ b/src/Crypto/Random/Effect.hs
@@ -1,11 +1,9 @@
 -- | An effect that can generate random bytes.
 --
 -- It is essentially a 'State' monad with a given 'CPRG'.
-{-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
-{-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TypeOperators #-}
 module Crypto.Random.Effect
   ( RNG
@@ -34,7 +32,6 @@
 import Control.Eff.Reader.Strict
 import Data.ByteString (ByteString)
 import Data.SecureMem (SecureMem)
-import Data.Typeable (Typeable)
 import Crypto.Random (CPRG, EntropyPool, SystemRNG)
 import qualified Crypto.Random as C
 
@@ -42,9 +39,6 @@
 data RNG
 
 instance SetMember RNG (State gen) (State gen :> a)
-
-deriving instance Typeable SystemRNG
-deriving instance Typeable EntropyPool
 
 -- | Run the effect using 'SystemRNG'.
 runSystemRNG