diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.1.2
+
+* Support GHC-8.6.5...9.10.1
+
 # 0.1.1.3
 
 * Use `CApiFFI` to call varargs C functions.
diff --git a/lukko.cabal b/lukko.cabal
--- a/lukko.cabal
+++ b/lukko.cabal
@@ -1,6 +1,6 @@
 cabal-version:      2.2
 name:               lukko
-version:            0.1.1.3
+version:            0.1.2
 synopsis:           File locking
 category:           System, Concurrency
 description:
@@ -49,15 +49,15 @@
 build-type:         Simple
 extra-source-files: CHANGELOG.md
 tested-with:
-  GHC ==7.6.3
-   || ==7.8.4
-   || ==7.10.3
-   || ==8.0.2
-   || ==8.2.2
-   || ==8.4.4
-   || ==8.6.5
+  GHC ==8.6.5
    || ==8.8.4
-   || ==8.10.3
+   || ==8.10.7
+   || ==9.0.2
+   || ==9.2.8
+   || ==9.4.8
+   || ==9.6.5
+   || ==9.8.2
+   || ==9.10.1
 
 source-repository head
   type:     git
@@ -72,8 +72,8 @@
 library
   default-language:   Haskell2010
   hs-source-dirs:     src
-  build-depends:      base >=4.5 && <4.15
-  build-tool-depends: hsc2hs:hsc2hs >=0.67 && <0.69
+  build-depends:      base >=4.12.0.0 && <4.21
+  build-tool-depends: hsc2hs:hsc2hs >=0.68.5 && <0.69
 
   -- Main library module
   exposed-modules:
@@ -121,17 +121,14 @@
   build-depends:
     , async                   ^>=2.2.2
     , base
-    , filepath                ^>=1.3.0.0 || ^>=1.4.0.0
+    , filepath                ^>=1.4.2.1  || ^>=1.5.2.0
     , lukko
-    , singleton-bool          ^>=0.1.5
-    , tasty                   ^>=1.4.0.1
-    , tasty-expected-failure  ^>=0.11.1.2 || ^>=0.12.2
+    , singleton-bool          ^>=0.1.8
+    , tasty                   ^>=1.5
+    , tasty-expected-failure  ^>=0.12.3
     , tasty-hunit             ^>=0.10.0.2
     , temporary               ^>=1.3
 
-  if !impl(ghc >=7.8)
-    build-depends: tagged ^>=0.8.5
-
   if os(windows)
     cpp-options: -DHAS_WINDOWS_LOCK
 
@@ -150,7 +147,7 @@
   ghc-options:      -threaded
   build-depends:
     , base
-    , bytestring  >=0.9.2.1 && <0.11
+    , bytestring  >=0.10.8.2 && <0.13
     , lukko
 
   if os(windows)
diff --git a/src-ofd/Lukko/OFD.hsc b/src-ofd/Lukko/OFD.hsc
--- a/src-ofd/Lukko/OFD.hsc
+++ b/src-ofd/Lukko/OFD.hsc
@@ -35,7 +35,21 @@
 
 #define _GNU_SOURCE
 #include <unistd.h>
+
+-- Support for file description locks (F_OFD_SETLKW and F_OFD_SETLK) was added
+-- to glibc in version 2.20. If we have an older version then we must get the
+-- functionality directly from the linux headers.
+--
+-- See glibc 2.20 release notes: <https://sourceware.org/legacy-ml/libc-alpha/2014-09/msg00088.html>
+#if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
+#if __GLIBC_PREREQ(2, 20)
 #include <fcntl.h>
+#else
+#include <linux/fcntl.h>
+#endif
+#else
+#include <fcntl.h>
+#endif
 
 import Control.Monad (void)
 import System.IO (Handle)
diff --git a/src/Lukko/Internal/FillBytes.hs b/src/Lukko/Internal/FillBytes.hs
--- a/src/Lukko/Internal/FillBytes.hs
+++ b/src/Lukko/Internal/FillBytes.hs
@@ -3,19 +3,4 @@
 {-# LANGUAGE Trustworthy      #-}
 module Lukko.Internal.FillBytes (fillBytes) where
 
-#if MIN_VERSION_base(4,8,0)
 import Foreign.Marshal.Utils (fillBytes)
-#else
-import Data.Word       (Word8)
-import Foreign.C.Types (CInt (..), CSize (..))
-import Foreign.Ptr     (Ptr (..))
-#endif
-
-#if !MIN_VERSION_base(4,8,0)
-fillBytes :: Ptr a -> Word8 -> Int -> IO ()
-fillBytes dest char size = do
-    _ <- memset dest (fromIntegral char) (fromIntegral size)
-    return ()
-
-foreign import ccall unsafe "string.h" memset  :: Ptr a -> CInt  -> CSize -> IO (Ptr a)
-#endif
diff --git a/src/Lukko/Internal/HandleToFD.hs b/src/Lukko/Internal/HandleToFD.hs
--- a/src/Lukko/Internal/HandleToFD.hs
+++ b/src/Lukko/Internal/HandleToFD.hs
@@ -5,28 +5,7 @@
 import qualified GHC.IO.FD as GHC (FD (..))
 import           System.IO (Handle)
 
-#if MIN_VERSION_base(4,10,0)
 import qualified GHC.IO.Handle.FD as GHC (handleToFd)
-#else
-import Control.Concurrent.MVar (readMVar)
-import Data.Typeable           (cast)
-import GHC.IO.Exception
-import GHC.IO.Handle.Internals
-import GHC.IO.Handle.Types
-#endif
 
 ghcHandleToFd :: Handle -> IO GHC.FD
-#if MIN_VERSION_base(4,10,0)
 ghcHandleToFd = GHC.handleToFd
-#else
-ghcHandleToFd h = case h of
-    FileHandle _ mv -> do
-      Handle__{haDevice = dev} <- readMVar mv
-      case cast dev of
-          Just fd -> return fd
-          Nothing -> throwErr "not a file descriptor"
-    DuplexHandle{} -> throwErr "not a file handle"
-  where
-    throwErr msg = ioException $ IOError (Just h)
-      InappropriateType "handleToFd" msg Nothing Nothing
-#endif