diff --git a/chrony-4.2.tar.gz b/chrony-4.2.tar.gz
deleted file mode 100644
index 42b76edbc3468f0571bd78a81e4c04986635247b..0000000000000000000000000000000000000000
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diff --git a/chrony-4.3.tar.gz b/chrony-4.3.tar.gz
new file mode 100644
index 0000000000000000000000000000000000000000..900caa9a03b8c1c59b64e198fced6afe50af95df
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diff --git a/chrony-nm-dispatcher-dhcp.patch b/chrony-nm-dispatcher-dhcp.patch
index 23087d6b84e9ea78322b82fd4a2cdceb5029ab68..028bdf826baafb6e8e05eb55b4137afff2e4059d 100644
--- a/chrony-nm-dispatcher-dhcp.patch
+++ b/chrony-nm-dispatcher-dhcp.patch
@@ -7,20 +7,23 @@ Use the PEERNTP and NTPSERVERARGS environment variables from
 
 Co-Authored-By: Christian Glombek <cglombek@redhat.com>
 
+---
+ examples/chrony.nm-dispatcher.dhcp | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
 diff --git a/examples/chrony.nm-dispatcher.dhcp b/examples/chrony.nm-dispatcher.dhcp
-index 6ea4c37..a6ad35a 100644
+index 547ce83..f23756e 100644
 --- a/examples/chrony.nm-dispatcher.dhcp
 +++ b/examples/chrony.nm-dispatcher.dhcp
-@@ -6,16 +6,24 @@
+@@ -10,13 +10,21 @@ action=$2
  
  chronyc=/usr/bin/chronyc
- default_server_options=iburst
+ server_options=iburst
 -server_dir=/var/run/chrony-dhcp
 +server_dir=/run/chrony-dhcp
  
  dhcp_server_file=$server_dir/$interface.sources
- # DHCP4_NTP_SERVERS is passed from DHCP options by NetworkManager.
- nm_dhcp_servers=$DHCP4_NTP_SERVERS
+ dhcp_ntp_servers="$DHCP4_NTP_SERVERS $DHCP6_DHCP6_NTP_SERVERS"
  
 +[ -f /etc/sysconfig/network ] && . /etc/sysconfig/network
 +[ -f /etc/sysconfig/network-scripts/ifcfg-"${interface}" ] && \
@@ -32,12 +35,18 @@ index 6ea4c37..a6ad35a 100644
 +    # Don't add NTP servers if PEERNTP=no specified; return early.
 +    [ "$PEERNTP" = "no" ] && return
 +
-     for server in $nm_dhcp_servers; do
--        echo "server $server $default_server_options" >> "$dhcp_server_file"
-+        echo "server $server ${NTPSERVERARGS:-$default_server_options}" >> "$dhcp_server_file"
+     for server in $dhcp_ntp_servers; do
+         # Check for invalid characters (from the DHCPv6 NTP FQDN suboption)
+         len1=$(printf '%s' "$server" | wc -c)
+@@ -25,7 +33,7 @@ add_servers_from_dhcp() {
+           continue
+         fi
+ 
+-        printf 'server %s %s\n' "$server" "$server_options" >> "$dhcp_server_file"
++        printf 'server %s %s\n' "$server" "${NTPSERVERARGS:-$server_options}" >> "$dhcp_server_file"
      done
      $chronyc reload sources > /dev/null 2>&1 || :
  }
 -- 
-2.29.2
+2.23.0
 
diff --git a/chrony.spec b/chrony.spec
index 4b2772230cc2aa07add9d46c78715ff63dde66f0..047863865ef1b878680a938bf17065204025cb4c 100644
--- a/chrony.spec
+++ b/chrony.spec
@@ -1,8 +1,8 @@
-%global clknetsim_ver 470b5e
+%global clknetsim_ver f00531
 
 Name:      chrony
-Version:   4.2
-Release:   3
+Version:   4.3
+Release:   1
 Summary:   An NTP client/server
 License:   GPLv2
 URL:       https://chrony.tuxfamily.org
@@ -13,8 +13,7 @@ Source6:   https://github.com/mlichvar/clknetsim/archive/%{clknetsim_ver}/clknet
 
 Patch1:	   chrony-nm-dispatcher-dhcp.patch
 Patch2:    chrony-services.patch
-BuildRequires: gcc gcc-c++ bison systemd libcap-devel libedit-devel nettle-devel pps-tools-devel libseccomp-devel
-
+BuildRequires: gcc gcc-c++ bison systemd libcap-devel libedit-devel nettle-devel pps-tools-devel libseccomp-devel m4
 Requires:      shadow-utils systemd timedatex
 
 %description
@@ -29,6 +28,10 @@ service to other computers in the network.
 %prep
 
 %autosetup -p1 -n  %{name}-%{version} -a 6
+
+# regenerate the file from getdate.y
+rm -f getdate.c
+
 mv clknetsim-%{clknetsim_ver}* test/simulation/clknetsim
 
 %build
@@ -135,6 +138,12 @@ fi
 %{_mandir}/man[158]/%{name}*.[158]*
 
 %changelog
+* Mon Jan 30 2023 chengyechun <chengyechun1@huawei.com> - 4.3-1
+- Type:enhancement
+- ID:NA
+- SUG:na
+- DESC:update to chrony-4.3 
+
 * Sat Dec 24 2022 chengyechun <chengyechun1@huawei.com> - 4.2-3
 - Type:bugfix
 - ID:NA
diff --git a/clknetsim-470b5e.tar.gz b/clknetsim-470b5e.tar.gz
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index 4bbf793573bbb443e8354ba2b15057ca0a76e21d..0000000000000000000000000000000000000000
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diff --git a/clknetsim-f00531.tar.gz b/clknetsim-f00531.tar.gz
new file mode 100644
index 0000000000000000000000000000000000000000..9528dc28b043b4493b5cebfab31d2427de616f17
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