diff --git a/CursesClient.hs b/CursesClient.hs
--- a/CursesClient.hs
+++ b/CursesClient.hs
@@ -378,9 +378,8 @@
     let v = streamView ss
         (len,n) = lenToSum (wh + v) $ allHeights ww ss
         ls = reverse . take len $ allLines ss
-        pls = take wh . drop (n - (wh + v)) . concat $
-            reverse . zip (False:repeat True) . reverse .
-            wrap ww <$> ls
+        pls = take wh . drop (n - (wh + v)) $ concatMap
+            (reverse . zip (False:repeat True) . reverse . wrap ww) ls
         win = streamWin ss
     liftIO $ do
         werase win
diff --git a/HexString.hs b/HexString.hs
--- a/HexString.hs
+++ b/HexString.hs
@@ -49,7 +49,7 @@
     parseHexString' _ = Nothing
 
 showHexString :: ByteString -> String
-showHexString = concat . (showHexWord8 <$>) . unpack
+showHexString = concatMap showHexWord8 . unpack
     where showHexWord8 w =
             let (a,b) = quotRem w 16
                 hex = ("0123456789abcdef" !!) . fromIntegral
diff --git a/Incoming.hs b/Incoming.hs
--- a/Incoming.hs
+++ b/Incoming.hs
@@ -12,7 +12,7 @@
 
 import           Control.Monad    (filterM, forM, forM_)
 import           Data.List        ((\\))
-import           Data.Maybe       (catMaybes)
+import           Data.Maybe       (mapMaybe)
 import           Safe             (maximumMay, readMay)
 import           System.Directory
 import           System.FileLock  (SharedExclusive (..), withFileLock)
@@ -63,8 +63,7 @@
 incomingDir = (</> "incoming")
 
 incomingNs :: FilePath -> IO [Int]
-incomingNs ddir = catMaybes . (readMay <$>) <$>
-    listDirectory (incomingDir ddir)
+incomingNs ddir = mapMaybe readMay <$> listDirectory (incomingDir ddir)
 
 incomingPath :: FilePath -> Incoming -> FilePath
 incomingPath ddir n = incomingDir ddir </> show n
diff --git a/Petname.hs b/Petname.hs
--- a/Petname.hs
+++ b/Petname.hs
@@ -16,7 +16,7 @@
 import           Control.Monad.Trans.Maybe (MaybeT (..), runMaybeT)
 import           Data.Char                 (isAlphaNum)
 import           Data.List                 (elemIndices)
-import           Data.Maybe                (catMaybes)
+import           Data.Maybe                (mapMaybe)
 import           Safe                      (lastMay, readMay)
 import           System.Directory          (createDirectoryIfMissing,
                                             listDirectory)
@@ -100,5 +100,4 @@
         writeFile path $ showUser user
 
 loadNames :: FilePath -> IO [Petname]
-loadNames ddir = catMaybes . (parsePetname <$>) <$>
-    listDirectory (namesDir ddir)
+loadNames ddir = mapMaybe parsePetname <$> listDirectory (namesDir ddir)
diff --git a/Talkat.hs b/Talkat.hs
--- a/Talkat.hs
+++ b/Talkat.hs
@@ -93,7 +93,7 @@
 doCmd :: FilePath -> Config -> SocksProxy -> [O.Opt] -> [String] -> Command -> IO ()
 doCmd ddir conf socksProxy opts args = \case
     Help -> case args of
-        [] -> putStr . O.globalHelp . init . concat $ (<>"\n") <$>
+        [] -> putStr . O.globalHelp . init $ concatMap (<>"\n")
             [ "Usage: htalkat [OPTION...] COMMAND [ARG...]"
             , ""
             , "Commands:"
@@ -217,5 +217,5 @@
         , "  Other users will be able to connect to you at talkat:FP@HOST[:PORT],"
         , "  where FP is as given by i[dentity], HOST is your hostname or IP address,"
         , "  and PORT is a non-standard port if you set one."
-        , "  See " <> ddir </> "listen.conf" <> " for configuration options,"
+        , "  See " <> ddir </> "htalkat.conf" <> " for configuration options,"
         , "  and " <> ddir </> "notify.sh" <> " to set up notifications." ]
diff --git a/Version.hs b/Version.hs
--- a/Version.hs
+++ b/Version.hs
@@ -16,4 +16,4 @@
 programName = "htalkat"
 
 version :: String
-version = "0.1.2.2"
+version = "0.1.2.3"
diff --git a/htalkat.cabal b/htalkat.cabal
--- a/htalkat.cabal
+++ b/htalkat.cabal
@@ -1,6 +1,6 @@
 cabal-version:      1.18
 name:               htalkat
-version:            0.1.2.2
+version:            0.1.2.3
 license:            GPL-3
 license-file:       COPYING
 maintainer:         mbays@sdf.org
@@ -60,7 +60,7 @@
         array >=0.3 && <0.6,
         asn1-encoding <0.10,
         asn1-types >=0.3.4 && <0.4,
-        bytestring >=0.10.8.0 && <0.12,
+        bytestring >=0.10.8.0 && <0.13,
         containers >=0.5.5.1 && <0.7,
         cryptonite >=0.26 && <0.31,
         data-default-class >=0.1.2.0 && <0.2,
@@ -70,7 +70,7 @@
         filelock <0.2,
         filepath >=1.3.0.2 && <1.5,
         hourglass >=0.2.12 && <0.3,
-        memory >=0.14 && <0.18,
+        memory >=0.14 && <0.19,
         mtl >=2.0 && <2.4,
         network >=2.4.2.3 && <3.2,
         network-simple >=0.4.3 && <0.5,