diff --git a/Network/Wai/Application/Classic/RevProxy.hs b/Network/Wai/Application/Classic/RevProxy.hs
--- a/Network/Wai/Application/Classic/RevProxy.hs
+++ b/Network/Wai/Application/Classic/RevProxy.hs
@@ -10,7 +10,7 @@
 import qualified Data.ByteString as BS (uncons)
 import qualified Data.ByteString.Char8 as BS hiding (uncons)
 import Data.Conduit
-import Data.Default
+import Data.Default.Class
 import qualified Network.HTTP.Client as H
 import qualified Network.HTTP.Client.Conduit as H
 import Network.HTTP.Types
diff --git a/wai-app-file-cgi.cabal b/wai-app-file-cgi.cabal
--- a/wai-app-file-cgi.cabal
+++ b/wai-app-file-cgi.cabal
@@ -1,5 +1,5 @@
 Name:                   wai-app-file-cgi
-Version:                2.0.1
+Version:                2.0.2
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -43,7 +43,7 @@
                       , case-insensitive
                       , conduit >= 0.5
                       , containers
-                      , data-default
+                      , data-default-class
                       , directory
                       , filepath
                       , http-client