diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Revision history for crypto-rng
 
+## 0.1.0.1  -- 2017-01-18
+
+* Removed a redundant constraint that led to build failures with GHC 8.0.2.
+
 ## 0.1.0.0  -- 2016-12-06
 
 * First version. Released on an unsuspecting world.
diff --git a/crypto-rng.cabal b/crypto-rng.cabal
--- a/crypto-rng.cabal
+++ b/crypto-rng.cabal
@@ -1,5 +1,5 @@
 name:                crypto-rng
-version:             0.1.0.0
+version:             0.1.0.1
 synopsis:            Cryptographic random number generator.
 
 description:         Convenient wrapper for the cryptographic random generator
@@ -27,12 +27,12 @@
                        Crypto.RNG.Class
                        Crypto.RNG.Utils
   build-depends:       base < 5,
-                       DRBG,
-                       bytestring,
-                       exceptions,
-                       crypto-api,
-                       monad-control,
-                       mtl,
-                       transformers-base
+                       DRBG              >= 0.5.5 && < 0.6,
+                       bytestring        >= 0.10.8 && < 0.11,
+                       crypto-api        >= 0.13.2 && < 0.14,
+                       mtl               >= 2.2.1 && < 2.3,
+                       exceptions        >= 0.8.3 && < 0.9,
+                       monad-control     >= 1.0.1 && < 1.1,
+                       transformers-base >= 0.4.4 && < 0.5
   hs-source-dirs:      src
   default-language:    Haskell2010
diff --git a/src/Crypto/RNG/Class.hs b/src/Crypto/RNG/Class.hs
--- a/src/Crypto/RNG/Class.hs
+++ b/src/Crypto/RNG/Class.hs
@@ -16,8 +16,7 @@
 -- | Monads carrying around the RNG state.
 class Monad m => CryptoRNG m where
   -- | Generate given number of cryptographically secure random bytes.
-  randomBytes :: CryptoRNG m
-              => ByteLength -- ^ number of bytes to generate
+  randomBytes :: ByteLength -- ^ number of bytes to generate
               -> m ByteString
 
 -- | Generic, overlapping instance.