diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,11 @@
 # Revision history for wild-bind-x11
 
+## 0.2.0.2  -- 2018-04-10
+
+* Confirmed test with `base-4.11`.
+* Stop using `ListT`, because it's deprecated since `transformers-0.5.3.0`.
+
+
 ## 0.2.0.1  -- 2018-02-06
 
 * Confirmed test with `async-2.2.1`.
diff --git a/src/WildBind/X11/Internal/FrontEnd.hs b/src/WildBind/X11/Internal/FrontEnd.hs
--- a/src/WildBind/X11/Internal/FrontEnd.hs
+++ b/src/WildBind/X11/Internal/FrontEnd.hs
@@ -18,11 +18,10 @@
 import Control.Concurrent (rtsSupportsBoundThreads)
 import Control.Concurrent.STM (atomically, TChan, newTChanIO, tryReadTChan, writeTChan)
 import Control.Exception (bracket, throwIO)
-import Control.Monad (when)
+import Control.Monad (when, filterM, mapM_)
 import Control.Monad.IO.Class (liftIO)
 import Control.Monad.Trans.Cont (ContT(ContT), runContT)
 import Control.Monad.Trans.Maybe (MaybeT, runMaybeT)
-import Control.Monad.Trans.List (ListT(ListT), runListT)
 import Control.Monad.Trans.Writer (WriterT, execWriterT, tell)
 import Data.Bits ((.|.))
 import Data.IORef (IORef, newIORef, readIORef, writeIORef)
@@ -152,8 +151,8 @@
                          then return IEDebounced
                          else return IEUnknown
 
-convertEvent :: (XKeyInput k) => KeyMaskMap -> Xlib.Display -> Ndeb.Debouncer -> Xlib.XEventPtr -> ListT IO (FrontEvent ActiveWindow k)
-convertEvent kmmap disp deb xev = ListT $ execWriterT $ convertEventWriter where
+convertEvent :: (XKeyInput k) => KeyMaskMap -> Xlib.Display -> Ndeb.Debouncer -> Xlib.XEventPtr -> IO [FrontEvent ActiveWindow k]
+convertEvent kmmap disp deb xev = execWriterT $ convertEventWriter where
   tellChangeEvent = (tellElem . FEChange) =<< (liftIO $ getActiveWindow disp)
   convertEventWriter :: XKeyInput k => WriterT [FrontEvent ActiveWindow k] IO ()
   convertEventWriter = do
@@ -167,13 +166,13 @@
      IEActiveWindow -> liftIO (Ndeb.notify deb) >> return ()
      IEUnknown -> return ()
 
-filterUnchangedEvent :: X11Front k -> FrontEvent ActiveWindow k -> ListT IO ()
-filterUnchangedEvent front (FEChange new_state) = do
+isSignificantEvent :: X11Front k -> FrontEvent ActiveWindow k -> IO Bool
+isSignificantEvent front (FEChange new_state) = do
   m_old_state <- liftIO $ readIORef $ x11PrevActiveWindow front
   case m_old_state of
-   Nothing -> return ()
-   Just old_state -> if new_state == old_state then empty else return ()
-filterUnchangedEvent _ _ = return ()
+   Nothing -> return True
+   Just old_state -> return (not $ new_state == old_state)
+isSignificantEvent _ _ = return True
 
 updateState :: X11Front k -> FrontEvent ActiveWindow k -> IO ()
 updateState front fev = case fev of
@@ -195,11 +194,11 @@
       (eve : rest) -> do
         x11UnshiftPendingEvents handle rest
         return eve
-  processEvents xev = runListT $ do
-    fevent <- convertEvent (x11KeyMaskMap handle) (x11Display handle) (x11Debouncer handle) xev
-    filterUnchangedEvent handle fevent
-    liftIO $ updateState handle fevent
-    return fevent
+  processEvents xev = do
+    fevents <- filterM (isSignificantEvent handle)
+               =<< convertEvent (x11KeyMaskMap handle) (x11Display handle) (x11Debouncer handle) xev
+    mapM_ (updateState handle) fevents
+    return fevents
 
 -- | Create 'FrontEnd' from 'X11Front' object.
 --
diff --git a/wild-bind-x11.cabal b/wild-bind-x11.cabal
--- a/wild-bind-x11.cabal
+++ b/wild-bind-x11.cabal
@@ -1,5 +1,5 @@
 name:                   wild-bind-x11
-version:                0.2.0.1
+version:                0.2.0.2
 author:                 Toshio Ito <debug.ito@gmail.com>
 maintainer:             Toshio Ito <debug.ito@gmail.com>
 license:                BSD3
@@ -28,7 +28,7 @@
                         WildBind.X11.Internal.NotificationDebouncer
   other-modules:        WildBind.X11.Internal.FrontEnd,
                         WildBind.X11.Internal.GrabMan
-  build-depends:        base >=4.6 && <5.0,
+  build-depends:        base >=4.6 && <4.12,
                         wild-bind >=0.1.0 && <0.2,
                         text >=1.2.0 && <1.3,
                         X11 >=1.6.1 && <1.9,