diff --git a/src/Data/Variation.hs b/src/Data/Variation.hs
--- a/src/Data/Variation.hs
+++ b/src/Data/Variation.hs
@@ -20,8 +20,7 @@
 import           Data.Functor.Classes
 import           Data.Monoid1
 import           Data.Semigroup
-import           Data.Serialize           (Serialize)
-import           Data.Variation.Instances as X ()
+import           Data.Serialize       (Serialize)
 import           GHC.Generics
 
 
diff --git a/src/Data/Variation/Instances.hs b/src/Data/Variation/Instances.hs
deleted file mode 100644
--- a/src/Data/Variation/Instances.hs
+++ /dev/null
@@ -1,17 +0,0 @@
-{-# OPTIONS_GHC -fno-warn-orphans  #-}
-
-module Data.Variation.Instances where
-
-
-import           Data.Functor.Classes
-import qualified Data.Map.Strict      as M
-
-instance Show2 M.Map where
-  liftShowsPrec2 spk slk spv slv d m =
-    showsUnaryWith (liftShowsPrec sp sl) "fromList" d (M.toList m)
-    where
-      sp = liftShowsPrec2 spk slk spv slv
-      sl = liftShowList2 spk slk spv slv
-
-instance Show k => Show1 (M.Map k) where
-  liftShowsPrec = liftShowsPrec2 showsPrec showList
diff --git a/variation.cabal b/variation.cabal
--- a/variation.cabal
+++ b/variation.cabal
@@ -1,5 +1,5 @@
 name:                variation
-version:             0.1.0.0
+version:             0.1.1.0
 synopsis: nominal value with possible variations
 description:
   this package provides a Variation data type: a (mandatory) nominal value with
@@ -13,8 +13,7 @@
 build-type:          Simple
 cabal-version:       >=1.10
 
-Tested-With:  GHC == 7.10.1, GHC == 7.10.2, GHC == 7.10.3
-            , GHC == 8.0.1, GHC == 8.0.2
+Tested-With: GHC == 8.0.1, GHC == 8.0.2
 
 source-repository head
   type:     git
@@ -24,16 +23,13 @@
 library
   exposed-modules:     Data.Variation
                      , Data.Monoid1
-                     , Data.Variation.Instances
   -- other-modules:
   -- other-extensions:
-  build-depends:       base >= 4.8 && < 5.0
+  build-depends:       base >= 4.9 && < 5.0
                      , cereal >= 0.5 && < 0.6
                      , deepseq >= 1.4 && < 1.5
                      , containers >= 0.5 && < 0.6
                      , semigroupoids >= 5.0 && < 6.0
-                     , transformers >= 0.5 && < 0.6
-                     , semigroups >= 0.18 && < 0.19
   hs-source-dirs:      src
   default-language:    Haskell2010
   ghc-options:         -Wall