diff --git a/monadLib.cabal b/monadLib.cabal
--- a/monadLib.cabal
+++ b/monadLib.cabal
@@ -1,5 +1,5 @@
 Name:           monadLib
-Version:        3.10
+Version:        3.10.1
 License:        BSD3
 License-file:   LICENSE
 Author:         Iavor S. Diatchki
@@ -9,20 +9,22 @@
 Synopsis:       A collection of monad transformers.
 Description:    A collection of monad transformers.
 Build-type:     Simple
-Cabal-version: >= 1.2
+Cabal-version: >= 2.0
 Extra-source-files:
   LICENSE,
   README,
   CHANGES
 
+
 Library
+  default-language: Haskell2010
   hs-source-dirs: src
   Exposed-modules:
     MonadLib,
     MonadLib.Monads,
     MonadLib.Derive
 
-  Build-depends: base >= 4 && < 5
+  Build-depends: base >= 4.9 && < 5
 
   GHC-options:    -O2 -Wall
 
diff --git a/src/MonadLib.hs b/src/MonadLib.hs
--- a/src/MonadLib.hs
+++ b/src/MonadLib.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE CPP, MultiParamTypeClasses, FunctionalDependencies,
-             UndecidableInstances, FlexibleInstances #-}
+             UndecidableInstances, FlexibleInstances, FlexibleContexts #-}
 {-# LANGUAGE DataKinds, TypeFamilies, TypeOperators #-}
 {-# LANGUAGE Rank2Types #-}
 {-# LANGUAGE ScopedTypeVariables #-}