Release version 6.4.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
diff --git a/NEWS b/NEWS
index 49aac83..d1c2655 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,10 @@
+Version 6.4 - July 1, 2023
+	* Feature: get/set Tx push buffer length (-G)
+	* Feature: sff-8636 and cmis: report LOL / LOS / Tx Fault (-m)
+	* Fix: fix duplex setting parser (-s)
+	* Misc: check and require C11 language standard
+	* Misc: clean up obsolete pre-build checks
+
 Version 6.3 - May 8, 2023
 	* Feature: PLCA support (--[gs]et-plca-cfg, --get-plca-status)
 	* Feature: MAC Merge layer support (--show-mm, --set-mm)
diff --git a/configure.ac b/configure.ac
index 0d1fd22..292eae3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-AC_INIT(ethtool, 6.3, netdev@vger.kernel.org)
+AC_INIT(ethtool, 6.4, netdev@vger.kernel.org)
 AC_PREREQ(2.52)
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([ethtool.c])
diff --git a/ethtool.8.in b/ethtool.8.in
index a987d6f..adf8900 100644
--- a/ethtool.8.in
+++ b/ethtool.8.in
@@ -117,7 +117,7 @@
 .  hy \\n(HY
 ..
 .
-.TH ETHTOOL 8 "May 2023" "Ethtool version @VERSION@"
+.TH ETHTOOL 8 "July 2023" "Ethtool version @VERSION@"
 .SH NAME
 ethtool \- query or control network driver and hardware settings
 .