diff --git a/enumset.cabal b/enumset.cabal
--- a/enumset.cabal
+++ b/enumset.cabal
@@ -1,5 +1,5 @@
 Name:             enumset
-Version:          0.1.0.1
+Version:          0.1.0.2
 License:          BSD3
 License-File:     LICENSE
 Author:           Henning Thielemann <haskell@henning-thielemann.de>
@@ -25,7 +25,7 @@
 Build-Type:       Simple
 
 Source-Repository this
-  Tag:         0.1.0.1
+  Tag:         0.1.0.2
   Type:        darcs
   Location:    http://code.haskell.org/~thielema/enumset/
 
@@ -39,7 +39,7 @@
     data-accessor >=0.2.1 && <0.3,
     storable-record >=0.0.1 && <0.1,
     semigroups >=0.1 && <1,
-    base >=4 && <5
+    base >=4.11 && <5
 
   GHC-Options:      -Wall
   Hs-Source-Dirs:   src
diff --git a/src/Data/EnumBitSet.hs b/src/Data/EnumBitSet.hs
--- a/src/Data/EnumBitSet.hs
+++ b/src/Data/EnumBitSet.hs
@@ -37,7 +37,7 @@
 import qualified Data.Bits as B
 import Data.Bits (Bits, )
 
-import Data.Monoid (Monoid(mempty, mappend), )
+import Data.Monoid (Monoid(mempty), )
 import Data.Semigroup (Semigroup((<>)), )
 
 import qualified Foreign.Storable.Newtype as Store
@@ -69,7 +69,6 @@
 -}
 instance (Enum a, Bits w) => Monoid (T w a) where
    mempty = empty
-   mappend = (<>)
 
 
 fromEnum :: (Enum a, Bits w) => a -> T w a