--- semigroups-0.16.2.2/semigroups.cabal~	2015-03-07 16:26:45.000000000 +0900
+++ semigroups-0.16.2.2/semigroups.cabal	2015-09-18 12:19:39.778089625 +0900
@@ -86,8 +86,7 @@
       Data.Semigroup.Generic
 
   build-depends:
-    base >= 2   && < 5,
-    nats >= 0.1 && < 2
+    base >= 2   && < 5
 
   if impl(ghc >= 7.4 && < 7.5)
     build-depends: ghc-prim