diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,11 @@
-## Unreleased
+## Version 3.1.2.1
+
+* Increasing base lower bound to 4.9.
+  [#473](https://github.com/haskell/network/pull/473)
+* Suppressing errors from removeFile in UNIX bind.
+  [#478](https://github.com/haskell/network/pull/478)
+* Restoring UNIX stub functions on Windows.
+  [#489](https://github.com/haskell/network/pull/489)
 
 ## Version 3.1.2.0
 
diff --git a/Network/Socket.hs b/Network/Socket.hs
--- a/Network/Socket.hs
+++ b/Network/Socket.hs
@@ -208,14 +208,12 @@
     , socketPortSafe
     , socketPort
 
-#if !defined(mingw32_HOST_OS)
     -- * UNIX-domain socket
     , isUnixDomainSocketAvailable
     , socketPair
     , sendFd
     , recvFd
     , getPeerCredential
-#endif
 
     -- * Name information
     , getNameInfo
@@ -252,7 +250,7 @@
     , filterCmsg
     , decodeCmsg
     , encodeCmsg
-    -- ** Class and yypes for control message
+    -- ** Class and types for control message
     , ControlMessage(..)
     , IPv4TTL(..)
     , IPv6HopLimit(..)
@@ -278,9 +276,9 @@
 import Network.Socket.SockAddr
 import Network.Socket.Syscall hiding (connect, bind, accept)
 import Network.Socket.Types
+import Network.Socket.Unix
 #if !defined(mingw32_HOST_OS)
 import Network.Socket.Posix.Cmsg
-import Network.Socket.Unix
 #else
 import Network.Socket.Win32.Cmsg
 #endif
diff --git a/Network/Socket/Posix/Cmsg.hsc b/Network/Socket/Posix/Cmsg.hsc
--- a/Network/Socket/Posix/Cmsg.hsc
+++ b/Network/Socket/Posix/Cmsg.hsc
@@ -253,5 +253,3 @@
       where
         defname = "CmsgId"
         def = defRead defname (uncurry CmsgId) readIntInt
-
-    
diff --git a/Network/Socket/SockAddr.hs b/Network/Socket/SockAddr.hs
--- a/Network/Socket/SockAddr.hs
+++ b/Network/Socket/SockAddr.hs
@@ -61,7 +61,7 @@
           Left e2 | not (isDoesNotExistError e2) -> throwIO (e2 :: IOException)
           _ -> do
             -- socket not actually in use, remove it and retry bind
-            removeFile p
+            void (try $ removeFile p :: IO (Either IOError ()))
             G.bind s a
   _ -> G.bind s a
 
diff --git a/Network/Socket/Unix.hsc b/Network/Socket/Unix.hsc
--- a/Network/Socket/Unix.hsc
+++ b/Network/Socket/Unix.hsc
@@ -17,7 +17,9 @@
 
 import Network.Socket.Buffer
 import Network.Socket.Imports
+#if !defined(mingw32_HOST_OS)
 import Network.Socket.Posix.Cmsg
+#endif
 import Network.Socket.Types
 
 #if defined(HAVE_GETPEEREID)
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@
 
 The `network` package support [3 major versions of GHC](https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/intro.html#ghc-version-numbering-policy) only.
 This means that the current stable version and two previous stable versions are supported.
+However, all GHC 8.x are supported currently.
 
 ### Windows
 
diff --git a/configure b/configure
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for Haskell network package 3.1.0.0.
+# Generated by GNU Autoconf 2.69 for Haskell network package 3.1.1.0.
 #
 # Report bugs to <libraries@haskell.org>.
 #
@@ -580,8 +580,8 @@
 # Identity of this package.
 PACKAGE_NAME='Haskell network package'
 PACKAGE_TARNAME='network'
-PACKAGE_VERSION='3.1.0.0'
-PACKAGE_STRING='Haskell network package 3.1.0.0'
+PACKAGE_VERSION='3.1.1.0'
+PACKAGE_STRING='Haskell network package 3.1.1.0'
 PACKAGE_BUGREPORT='libraries@haskell.org'
 PACKAGE_URL=''
 
@@ -661,7 +661,6 @@
 docdir
 oldincludedir
 includedir
-runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -733,7 +732,6 @@
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
-runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -986,15 +984,6 @@
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
-  -runstatedir | --runstatedir | --runstatedi | --runstated \
-  | --runstate | --runstat | --runsta | --runst | --runs \
-  | --run | --ru | --r)
-    ac_prev=runstatedir ;;
-  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
-  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
-  | --run=* | --ru=* | --r=*)
-    runstatedir=$ac_optarg ;;
-
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1132,7 +1121,7 @@
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir runstatedir
+		libdir localedir mandir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1245,7 +1234,7 @@
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures Haskell network package 3.1.0.0 to adapt to many kinds of systems.
+\`configure' configures Haskell network package 3.1.1.0 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1285,7 +1274,6 @@
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
-  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1311,7 +1299,7 @@
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of Haskell network package 3.1.0.0:";;
+     short | recursive ) echo "Configuration of Haskell network package 3.1.1.0:";;
    esac
   cat <<\_ACEOF
 
@@ -1396,7 +1384,7 @@
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-Haskell network package configure 3.1.0.0
+Haskell network package configure 3.1.1.0
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -1922,7 +1910,7 @@
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by Haskell network package $as_me 3.1.0.0, which was
+It was created by Haskell network package $as_me 3.1.1.0, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -4429,7 +4417,7 @@
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by Haskell network package $as_me 3.1.0.0, which was
+This file was extended by Haskell network package $as_me 3.1.1.0, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -4482,7 +4470,7 @@
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-Haskell network package config.status 3.1.0.0
+Haskell network package config.status 3.1.1.0
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_INIT([Haskell network package],
-        [3.1.2.0],
+        [3.1.2.1],
         [libraries@haskell.org],
         [network])
 
diff --git a/network.cabal b/network.cabal
--- a/network.cabal
+++ b/network.cabal
@@ -1,6 +1,6 @@
 cabal-version:  1.18
 name:           network
-version:        3.1.2.0
+version:        3.1.2.1
 license:        BSD3
 license-file:   LICENSE
 maintainer:     Kazu Yamamoto, Evan Borden
@@ -84,9 +84,10 @@
     Network.Socket.SockAddr
     Network.Socket.Syscall
     Network.Socket.Types
+    Network.Socket.Unix
 
   build-depends:
-    base >= 4.7 && < 5,
+    base >= 4.9 && < 5,
     bytestring == 0.10.*,
     deepseq,
     directory
@@ -107,7 +108,6 @@
       Network.Socket.Posix.CmsgHdr
       Network.Socket.Posix.IOVec
       Network.Socket.Posix.MsgHdr
-      Network.Socket.Unix
 
   if os(solaris)
     extra-libraries: nsl, socket
@@ -144,7 +144,7 @@
   --     both packages to a small enough version range.
   build-tools: hspec-discover >= 2.6
   build-depends:
-    base >= 4.7 && < 5,
+    base >= 4.9 && < 5,
     bytestring,
     directory,
     HUnit,
@@ -161,7 +161,7 @@
   type: exitcode-stdio-1.0
 
   build-depends:
-    base >= 4.7 && < 5,
+    base >= 4.9 && < 5,
     doctest >= 0.10.1,
     network
 
diff --git a/tests/Network/SocketSpec.hs b/tests/Network/SocketSpec.hs
--- a/tests/Network/SocketSpec.hs
+++ b/tests/Network/SocketSpec.hs
@@ -34,7 +34,7 @@
               return sock
 
         it "fails to connect and throws an IOException" $ do
-            connect' (8080 :: Int) `shouldThrow` anyIOException
+            connect' (8003 :: Int) `shouldThrow` anyIOException
 
         it "successfully connects to a socket with no exception" $ do
             withPort $ \portVar -> test (tcp serverAddr return portVar)
