diff --git a/pipes-concurrency.cabal b/pipes-concurrency.cabal
--- a/pipes-concurrency.cabal
+++ b/pipes-concurrency.cabal
@@ -1,5 +1,5 @@
 Name: pipes-concurrency
-Version: 2.0.10
+Version: 2.0.11
 Cabal-Version: >=1.8.0.2
 Build-Type: Simple
 License: BSD3
@@ -33,7 +33,7 @@
     Build-Depends:
         base          >= 4       && < 5   ,
         async         >= 2.0.0.0 && < 2.3 ,
-        contravariant >= 1.3.3   && < 1.5 ,
+        contravariant >= 1.3.3   && < 1.6 ,
         pipes         >= 4.0     && < 4.4 ,
         semigroups                  < 0.19,
         stm           >= 2.4.3   && < 2.5 ,