diff --git a/VERSION b/VERSION
--- a/VERSION
+++ b/VERSION
@@ -1,3 +1,7 @@
+0.3.7 (2013-08-08):
+	- System.Posix.IO.ByteString: updated fdSeek and tryFdSeek
+	  to use the unix-2.6.0.1 implementation (replacing the old
+	  unix-2.4.2.0 implementation)
 0.3.6 (2013-05-29):
 	- System.Posix.Types.Iovec: adjusted unsafeForeignPtrToPtr for GHC 7.8
 0.3.5.4 (2012-08-23):
diff --git a/src/System/Posix/IO/ByteString.hsc b/src/System/Posix/IO/ByteString.hsc
--- a/src/System/Posix/IO/ByteString.hsc
+++ b/src/System/Posix/IO/ByteString.hsc
@@ -24,7 +24,7 @@
 {-# LANGUAGE ForeignFunctionInterface #-}
 {-# OPTIONS_GHC -fwarn-tabs #-}
 ----------------------------------------------------------------
---                                                    2012.08.23
+--                                                    2013.08.08
 -- |
 -- Module      :  System.Posix.IO.ByteString
 -- Copyright   :  Copyright (c) 2010--2012 wren ng thornton
@@ -90,6 +90,7 @@
 
 import           System.IO                (SeekMode(..))
 import qualified System.IO.Error          as IOE
+import qualified System.Posix.Internals   as Base
 import           System.Posix.Types.Iovec
 import           System.Posix.Types       ( Fd, ByteCount, FileOffset
                                           , CSsize(..), COff(..))
@@ -754,12 +755,7 @@
 
 
 ----------------------------------------------------------------
--- It's not clear whether the @unix@ version uses a safe or unsafe call.
-foreign import ccall safe "lseek"
-    -- off_t lseek(int fildes, off_t offset, int whence);
-    c_safe_lseek :: CInt -> COff -> CInt -> IO COff
 
-
 mode2Int :: SeekMode -> CInt
 mode2Int AbsoluteSeek = (#const SEEK_SET)
 mode2Int RelativeSeek = (#const SEEK_CUR)
@@ -771,14 +767,14 @@
 -- POSIX.1 @lseek(2)@ system call. If there are any errors, then
 -- they are thrown as 'IOE.IOError' exceptions.
 --
--- This is the same as 'System.Posix.IO.fdSeek' in @unix-2.4.2.0@,
+-- This is the same as 'System.Posix.IO.fdSeek' in @unix-2.6.0.1@,
 -- but provided here for consistency.
 --
 -- /Since: 0.3.5/
 fdSeek :: Fd -> SeekMode -> FileOffset -> IO FileOffset
 fdSeek fd mode off =
     C.throwErrnoIfMinus1 "fdSeek"
-        $ c_safe_lseek (fromIntegral fd) off (mode2Int mode)
+        $ Base.c_lseek (fromIntegral fd) off (mode2Int mode)
 
 
 -- | Repositions the offset of the file descriptor according to the
@@ -790,7 +786,7 @@
 tryFdSeek :: Fd -> SeekMode -> FileOffset -> IO (Either C.Errno FileOffset)
 tryFdSeek fd mode off =
     eitherErrnoIfMinus1
-        $ c_safe_lseek (fromIntegral fd) off (mode2Int mode)
+        $ Base.c_lseek (fromIntegral fd) off (mode2Int mode)
 
 ----------------------------------------------------------------
 ----------------------------------------------------------- fin.
diff --git a/unix-bytestring.cabal b/unix-bytestring.cabal
--- a/unix-bytestring.cabal
+++ b/unix-bytestring.cabal
@@ -1,5 +1,5 @@
 ----------------------------------------------------------------
--- wren ng thornton <wren@community.haskell.org>    ~ 2013.05.29
+-- wren ng thornton <wren@community.haskell.org>    ~ 2013.08.08
 ----------------------------------------------------------------
 
 -- By and large Cabal >=1.2 is fine; but >= 1.6 gives tested-with:
@@ -8,8 +8,8 @@
 Build-Type:     Simple
 
 Name:           unix-bytestring
-Version:        0.3.6
-Stability:      experimental
+Version:        0.3.7
+Stability:      provisional
 Homepage:       http://code.haskell.org/~wren/
 Author:         wren ng thornton
 Maintainer:     wren@community.haskell.org
@@ -33,7 +33,7 @@
     an @Fd@, so we're not offering a complete replacement.
 
 Tested-With:
-    GHC == 6.12.1, GHC == 6.12.3, GHC == 7.6.1
+    GHC == 6.12.1, GHC == 6.12.3, GHC == 7.4.2, GHC == 7.6.1
 Extra-source-files:
     README, VERSION
 Source-Repository head