diff --git a/Crypto/Classical/Letter.hs b/Crypto/Classical/Letter.hs
--- a/Crypto/Classical/Letter.hs
+++ b/Crypto/Classical/Letter.hs
@@ -6,6 +6,7 @@
 
 module Crypto.Classical.Letter where
 
+import Control.Applicative ((<$>))
 import Data.Char
 import Test.QuickCheck
 
diff --git a/Crypto/Classical/Test.hs b/Crypto/Classical/Test.hs
--- a/Crypto/Classical/Test.hs
+++ b/Crypto/Classical/Test.hs
@@ -16,6 +16,7 @@
   , testAll
   ) where
 
+import           Control.Applicative ((<$>))
 import           Control.Lens
 import           Control.Monad (void)
 import           Crypto.Classical.Cipher
diff --git a/crypto-classical.cabal b/crypto-classical.cabal
--- a/crypto-classical.cabal
+++ b/crypto-classical.cabal
@@ -1,6 +1,6 @@
 name:                crypto-classical
 
-version:             0.0.2
+version:             0.0.3
 
 synopsis:            An educational tool for studying classical cryptography schemes.