diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+0.3.1.6
+  * Relax unix dependency.
+
 0.3.1.5
   * Retry flock call on EINTR. Thanks to Niklas Baumstark.
 
diff --git a/flock.cabal b/flock.cabal
--- a/flock.cabal
+++ b/flock.cabal
@@ -1,5 +1,5 @@
 Name:               flock
-Version:            0.3.1.5
+Version:            0.3.1.6
 License:            OtherLicense
 License-File:       COPYING
 Copyright:          Ian Lynagh, 2007
@@ -25,6 +25,6 @@
                     , transformers >= 0.2 && < 0.4
                     , monad-control >= 0.3 && < 0.4
                     , lifted-base >= 0.1 && < 0.3
-                    , unix >= 2.3 && < 2.7
+                    , unix >= 2.3 && < 2.8
   Exposed-modules:    System.Lock.FLock
   GHC-Options:        -Wall