diff --git a/scrypt.cabal b/scrypt.cabal
--- a/scrypt.cabal
+++ b/scrypt.cabal
@@ -1,5 +1,5 @@
 name:           scrypt
-version:        0.3.3
+version:        0.3.4
 license:        BSD3
 license-file:   LICENSE
 category:       Cryptography
@@ -39,7 +39,7 @@
     build-depends:
         base == 4.*,
         base64-bytestring >= 0.1 && < 2,
-        bytestring == 0.9.*,
+        bytestring >= 0.9 && < 0.11,
         entropy == 0.2.*
 
     ghc-options: -Wall
@@ -58,7 +58,7 @@
     build-depends:
         scrypt,
         base == 4.*,
-        bytestring == 0.9.*,
+        bytestring >= 0.9 && < 0.11,
         HUnit == 1.2.*,
         QuickCheck == 2.*,
         test-framework == 0.6.*,