diff --git a/IPv6Addr.cabal b/IPv6Addr.cabal
--- a/IPv6Addr.cabal
+++ b/IPv6Addr.cabal
@@ -1,5 +1,5 @@
 name:                IPv6Addr
-version:             0.6.2.0
+version:             0.6.3
 synopsis:            Library to deal with IPv6 address text representations.
 description:         Library to deal with IPv6 address text representations, canonization and manipulations.
 homepage:            https://github.com/MichelBoucey/IPv6Addr
@@ -21,12 +21,12 @@
   exposed-modules:  Text.IPv6Addr, Text.IPv6Addr.Types, Text.IPv6Addr.Manip, Text.IPv6Addr.Internal
   other-extensions: OverloadedStrings
   build-depends:    base >=4.6 && <5
-                  , text >=1.1
-                  , iproute >=1.3
-                  , network >=2.5
-                  , random >=1.0
-                  , attoparsec >=0.12
-                  , network-info >=0.2
+                  , text >=1.1 && <1.3
+                  , iproute >=1.3 && <1.8
+                  , network >=2.5 && <2.7
+                  , random >=1.0 && <=1.1
+                  , attoparsec >=0.12 && <0.14
+                  , network-info >=0.2 && <=0.3
   default-language: Haskell2010
   GHC-Options:      -Wall
 
diff --git a/Text/IPv6Addr/Internal.hs b/Text/IPv6Addr/Internal.hs
--- a/Text/IPv6Addr/Internal.hs
+++ b/Text/IPv6Addr/Internal.hs
@@ -10,9 +10,9 @@
     , isIPv6Addr
     , maybeTokIPv6Addr
     , maybeTokPureIPv6Addr
+    , toDoubleColon
     , fromDoubleColon
     , fromIPv6Addr
-    , toDoubleColon
     , networkInterfacesIPv6AddrList
     ) where
 
@@ -66,7 +66,8 @@
                 AllZeros     -> lenconst
                 _            -> False
          1 -> case lasttk of
-                IPv4Addr _ -> (lentks == 13 && cdctks == 0) || (lentks < 12 && cdctks == 1)
+                IPv4Addr _ ->
+                  (lentks == 13 && cdctks == 0) || (lentks < 12 && cdctks == 1)
                 _          -> False
          _ -> False))
          where
diff --git a/Text/IPv6Addr/Manip.hs b/Text/IPv6Addr/Manip.hs
--- a/Text/IPv6Addr/Manip.hs
+++ b/Text/IPv6Addr/Manip.hs
@@ -30,10 +30,11 @@
         | c == '_'  = intToDigit <$> randomRIO (0,15)
         | otherwise = return c
 
--- | Generates a random partial 'IPv6Addr' with n 'SixteenBit'
+-- | Generates a random partial 'IPv6Addr' with n 'SixteenBit'.
 randPartialIPv6Addr :: Int -> IO [IPv6AddrToken]
 randPartialIPv6Addr n
-  | n > 0 && n < 9 = intersperse Colon <$> replicateM n (randIPv6AddrChunk "____")
+  | n > 0 && n < 9 =
+    intersperse Colon <$> replicateM n (randIPv6AddrChunk "____")
   | otherwise      = return []
 
 -- | Given a MAC address, returns 'Just' the corresponding 'IPv6AddrToken' list, or 'Nothing'.
@@ -58,8 +59,9 @@
 -- > getTokIPv6AddrOf "eth0" == Just [SixteenBit "fe80",DoubleColon,SixteenBit "fa1d",Colon,SixteenBit "58cc",Colon,SixteenBit "9516"]
 --
 getTokIPv6AddrOf :: String -> IO (Maybe [IPv6AddrToken])
-getTokIPv6AddrOf s = maybe Nothing (maybeTokIPv6Addr. T.pack . show) <$>
-                       (lookup s <$> networkInterfacesIPv6AddrList)
+getTokIPv6AddrOf s =
+  maybe Nothing (maybeTokIPv6Addr. T.pack . show) <$>
+    (lookup s <$> networkInterfacesIPv6AddrList)
 
 -- | Given a valid name of a local network interface,
 -- returns 'Just' the corresponding list of 'IPv6AddrToken' of the interface's MAC Address,
@@ -72,6 +74,7 @@
   maybe Nothing (macAddrToIPv6AddrTokens . T.pack . show) <$>
     (lookup s <$> networkInterfacesMacAddrList)
   where
-    networkInterfacesMacAddrList = getNetworkInterfaces >>= \n -> return $ map networkInterfacesMac n
+    networkInterfacesMacAddrList = getNetworkInterfaces >>=
+      \n -> return $ map networkInterfacesMac n
       where networkInterfacesMac (NetworkInterface n _ _ m) = (n,m)