diff --git a/Lucu.cabal b/Lucu.cabal
--- a/Lucu.cabal
+++ b/Lucu.cabal
@@ -8,7 +8,7 @@
         messing around FastCGI. It is also intended to be run behind a
         reverse-proxy so it doesn't have some facilities like logging,
         client filtering or such like.
-Version: 0.3
+Version: 0.3.1
 License: PublicDomain
 License-File: COPYING
 Author: PHO <pho at cielonegro dot org>
@@ -43,7 +43,7 @@
 
 Library
     Build-Depends:
-        HsOpenSSL, base >= 4, bytestring, containers, dataenc,
+        HsOpenSSL, base >= 4 && < 5, bytestring, containers, dataenc,
         directory, haskell-src, hxt, mtl, network, stm, time, unix,
         zlib
     Exposed-Modules:
diff --git a/NEWS b/NEWS
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,10 @@
+Changes from 0.3 to 0.3.1
+-------------------------
+* Network.HTTP.Lucu.Resource:
+    - Bugfix: getRemoteAddr' didn't work on little-endian architectures. (Thanks: Voker57)
+    - Bugfix: getRemoteAddr' didn't work for IPv6 network.
+    - New function: getRemoteHost
+
 Changes from 0.2.1 to 0.3
 -------------------------
 * Added SSL support:
diff --git a/Network/HTTP/Lucu/Resource.hs b/Network/HTTP/Lucu/Resource.hs
--- a/Network/HTTP/Lucu/Resource.hs
+++ b/Network/HTTP/Lucu/Resource.hs
@@ -73,6 +73,7 @@
     , getConfig
     , getRemoteAddr
     , getRemoteAddr'
+    , getRemoteHost
     , getRemoteCertificate
     , getRequest
     , getMethod
@@ -136,7 +137,6 @@
 
 import           Control.Concurrent.STM
 import           Control.Monad.Reader
-import           Data.Bits
 import qualified Data.ByteString as Strict (ByteString)
 import qualified Data.ByteString.Lazy as Lazy (ByteString)
 import qualified Data.ByteString.Char8 as C8 hiding (ByteString)
@@ -211,20 +211,15 @@
 -- you want a 'Network.Socket.SockAddr' instead of 'Prelude.String',
 -- use 'getRemoteAddr'.
 getRemoteAddr' :: Resource String
-getRemoteAddr' = do addr <- getRemoteAddr
-                    case addr of
-                      -- Network.Socket は IPv6 を考慮してゐないやうだ…
-                      SockAddrInet _ v4addr
-                          -> let b1 = (v4addr `shiftR` 24) .&. 0xFF
-                                 b2 = (v4addr `shiftR` 16) .&. 0xFF
-                                 b3 = (v4addr `shiftR`  8) .&. 0xFF
-                                 b4 =  v4addr              .&. 0xFF
-                             in
-                               return $ concat $ intersperse "." $ map show [b1, b2, b3, b4]
-                      SockAddrUnix path
-                          -> return path
-                      _
-                          -> undefined
+getRemoteAddr' = do addr          <- getRemoteAddr
+                    (Just str, _) <- liftIO $! getNameInfo [NI_NUMERICHOST] True False addr
+                    return str
+
+-- |Resolve an address to the remote host.
+getRemoteHost :: Resource String
+getRemoteHost = do addr          <- getRemoteAddr
+                   (Just str, _) <- liftIO $! getNameInfo [] True False addr
+                   return str
 
 -- | Return the X.509 certificate of the client, or 'Nothing' if:
 --