diff --git a/src/App.hs b/src/App.hs
index 4140e7c..f0d80cb 100644
--- a/src/App.hs
+++ b/src/App.hs
@@ -12,13 +12,13 @@ module App (
     , update_
   ) where
 
-import Data.Map ((!))
 import Control.Concurrent (MVar, modifyMVar, putMVar, readMVar, takeMVar)
 import Control.Monad.Reader (ReaderT(..), ask, asks, lift)
-import Network.WebSockets (Connection)
+import Data.Map ((!))
 import Hanafuda.KoiKoi (PlayerID)
-import qualified Session (T(..))
+import Network.WebSockets (Connection)
 import qualified Server (T(..))
+import qualified Session (T(..))
 
 data Context = Context {
       mServer :: MVar Server.T
diff --git a/src/Automaton.hs b/src/Automaton.hs
index 9280932..0adaf64 100644
--- a/src/Automaton.hs
+++ b/src/Automaton.hs
@@ -3,20 +3,20 @@ module Automaton (
     start
   ) where
 
+import qualified App (Context(..), T, current, debug, get, server, try, update_)
 import Control.Monad.Reader (asks)
-import qualified RW (RW(..))
 import Data.Map (Map, (!?))
 import qualified Game (new, play)
 import qualified Hanafuda.KoiKoi as KoiKoi (
     Game, GameBlueprint(..), GameID, Step(..)
   )
-import qualified Session (Status(..), T(..), Update)
-import qualified Server (endGame, get, logIn, logOut, update, room)
-import qualified App (Context(..), T, current, debug, get, server, try, update_)
 import qualified Hanafuda.Message as Message (FromClient(..), T(..))
 import qualified Messaging (
     broadcast, get, notifyPlayers, relay, send, sendTo, update
   )
+import qualified RW (RW(..))
+import qualified Server (endGame, get, logIn, logOut, update, room)
+import qualified Session (Status(..), T(..), Update)
 
 receive :: Session.Status -> Message.FromClient -> App.T ()
 
diff --git a/src/Game.hs b/src/Game.hs
index f84059a..6009c15 100644
--- a/src/Game.hs
+++ b/src/Game.hs
@@ -10,12 +10,12 @@ import Control.Monad.Reader (lift)
 import Control.Monad.Writer (runWriterT)
 import Data.Map (mapWithKey)
 import qualified Hanafuda (empty)
+import Hanafuda.KoiKoi (Game, GameBlueprint(..), GameID, Mode(..), PlayerID)
 import qualified Hanafuda.KoiKoi as KoiKoi (
     Action, Move(..), play, new
   )
-import Hanafuda.KoiKoi (Game, GameBlueprint(..), GameID, Mode(..), PlayerID)
-import qualified Hanafuda.Player (Player(..), Players(..))
 import Hanafuda.Message (PublicGame)
+import qualified Hanafuda.Player (Player(..), Players(..))
 import qualified Server (register)
 
 new :: (PlayerID, PlayerID) -> App.T GameID
diff --git a/src/Main.hs b/src/Main.hs
index 1290149..2b91341 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -2,21 +2,21 @@
 {-# LANGUAGE NamedFieldPuns #-}
 module Main where
 
-import Network.Wai.Handler.Warp (run)
-import Network.HTTP.Types.Status (badRequest400)
-import Network.WebSockets (ServerApp, acceptRequest, defaultConnectionOptions)
-import Network.Wai.Handler.WebSockets (websocketsOr)
-import Network.Wai (responseLBS)
-import Control.Monad.Reader (ReaderT(..), asks)
+import qualified App (Context(..), T, update_)
+import qualified Automaton (start)
+import qualified Config (listenPort)
 import Control.Concurrent (newMVar, modifyMVar)
 import Control.Exception (finally)
-import qualified Config (listenPort)
-import qualified Session (open)
-import qualified Server (disconnect, new, register)
-import qualified App (Context(..), T, update_)
+import Control.Monad.Reader (ReaderT(..), asks)
 import qualified Hanafuda.Message as Message (FromClient(..))
 import Messaging (broadcast, relay)
-import qualified Automaton (start)
+import Network.HTTP.Types.Status (badRequest400)
+import Network.Wai (responseLBS)
+import Network.Wai.Handler.Warp (run)
+import Network.Wai.Handler.WebSockets (websocketsOr)
+import Network.WebSockets (ServerApp, acceptRequest, defaultConnectionOptions)
+import qualified Server (disconnect, new, register)
+import qualified Session (open)
 
 exit :: App.T ()
 exit = do
diff --git a/src/Messaging.hs b/src/Messaging.hs
index 53586a8..a2b1647 100644
--- a/src/Messaging.hs
+++ b/src/Messaging.hs
@@ -13,20 +13,20 @@ module Messaging (
     , update
   ) where
 
-import Data.List (intercalate)
-import Data.Foldable (forM_)
-import Data.Map (keys)
-import Data.Aeson (eitherDecode', encode)
-import Network.WebSockets (receiveData, sendTextData)
-import Data.ByteString.Lazy.Char8 (unpack)
-import Control.Monad.Reader (asks, lift)
-import qualified Game (export)
-import qualified Session (T(..))
-import qualified Server (T(..), get)
 import qualified App (Context(..), T, connection, debug, server)
+import Control.Monad.Reader (asks, lift)
+import Data.Aeson (eitherDecode', encode)
+import Data.ByteString.Lazy.Char8 (unpack)
+import Data.Foldable (forM_)
+import Data.List (intercalate)
+import Data.Map (keys)
 import qualified Hanafuda.KoiKoi as KoiKoi (Action, Game, GameBlueprint(..), PlayerID)
-import qualified Hanafuda.Message as Message (T)
 import Hanafuda.Message (FromClient(..), T(..))
+import qualified Hanafuda.Message as Message (T)
+import Network.WebSockets (receiveData, sendTextData)
+import qualified Game (export)
+import qualified Server (T(..), get)
+import qualified Session (T(..))
 
 sendTo :: [KoiKoi.PlayerID] -> Message.T -> App.T ()
 sendTo playerIDs obj = do
diff --git a/src/Session.hs b/src/Session.hs
index 7d61b60..621c540 100644
--- a/src/Session.hs
+++ b/src/Session.hs
@@ -7,8 +7,8 @@ module Session (
     , open
   ) where
 
-import Network.WebSockets (Connection)
 import Hanafuda.KoiKoi (GameID, PlayerID)
+import Network.WebSockets (Connection)
 import qualified RW (RW(..))
 
 data Status =