diff --git a/mighttpd2.cabal b/mighttpd2.cabal
--- a/mighttpd2.cabal
+++ b/mighttpd2.cabal
@@ -1,5 +1,5 @@
 Name:                   mighttpd2
-Version:                3.0.5
+Version:                3.0.6
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -56,9 +56,9 @@
                       , unix
                       , unix-time
                       , unordered-containers
-                      , wai >= 2.1
+                      , wai >= 2.1 && < 3.0
                       , wai-app-file-cgi >= 1.0
-                      , warp >= 2.1
+                      , warp >= 2.1 && < 3.0
 
 Executable mighty
   Default-Language:     Haskell2010