diff --git a/wai-logger.cabal b/wai-logger.cabal
--- a/wai-logger.cabal
+++ b/wai-logger.cabal
@@ -1,5 +1,5 @@
 Name:                   wai-logger
-Version:                2.0.1
+Version:                2.0.2
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -32,7 +32,7 @@
                       , old-locale
   else
       Build-Depends:    unix
-                      , unix-time
+                      , unix-time >= 0.2.2
 
 Test-Suite doctest
   Type:                 exitcode-stdio-1.0