diff --git a/chrony-test-fix-util-unit-test-for-NTP-era-split.patch b/chrony-test-fix-util-unit-test-for-NTP-era-split.patch
new file mode 100644
index 0000000..c1841ed
--- /dev/null
+++ b/chrony-test-fix-util-unit-test-for-NTP-era-split.patch
@@ -0,0 +1,41 @@
+From 2d9eb5b6fa5225a7300c8eed95712969249900fb Mon Sep 17 00:00:00 2001
+From: Miroslav Lichvar <mlichvar@redhat.com>
+Date: Fri, 3 Jan 2020 11:25:55 +0100
+Subject: [PATCH] test: fix util unit test for NTP era split
+
+The current default NTP era split passed the Unix epoch (~50 years ago),
+which means the epoch converted to an NTP timestamp and back ends up in
+the next NTP era (year 2106).
+
+Fix the test to take into account the era split.
+---
+ test/unit/util.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/test/unit/util.c b/test/unit/util.c
+index f4d9f33..af9e90c 100644
+--- a/test/unit/util.c
++++ b/test/unit/util.c
+@@ -100,11 +100,19 @@ void test_unit(void) {
+   ntp_ts.hi = htonl(JAN_1970);
+   ntp_ts.lo = 0xffffffff;
+   UTI_Ntp64ToTimespec(&ntp_ts, &ts);
++#if defined(HAVE_LONG_TIME_T) && NTP_ERA_SPLIT > 0
++  TEST_CHECK(ts.tv_sec == 0x100000000LL * (1 + (NTP_ERA_SPLIT - 1) / 0x100000000LL));
++#else
+   TEST_CHECK(ts.tv_sec == 0);
++#endif
+   TEST_CHECK(ts.tv_nsec == 999999999);
+ 
+   UTI_AddDoubleToTimespec(&ts, 1e-9, &ts);
++#if defined(HAVE_LONG_TIME_T) && NTP_ERA_SPLIT > 0
++  TEST_CHECK(ts.tv_sec == 1 + 0x100000000LL * (1 + (NTP_ERA_SPLIT - 1) / 0x100000000LL));
++#else
+   TEST_CHECK(ts.tv_sec == 1);
++#endif
+   TEST_CHECK(ts.tv_nsec == 0);
+ 
+   ntp_fuzz.hi = 0;
+-- 
+2.25.0
+
diff --git a/chrony-test-update-processing-of-packet-log.patch b/chrony-test-update-processing-of-packet-log.patch
new file mode 100644
index 0000000..d0d0a15
--- /dev/null
+++ b/chrony-test-update-processing-of-packet-log.patch
@@ -0,0 +1,30 @@
+From 62d6aed6a64b887c9e3b7f03d9e0db1deaa2696a Mon Sep 17 00:00:00 2001
+From: Miroslav Lichvar <mlichvar@redhat.com>
+Date: Tue, 18 Jun 2019 15:41:50 +0200
+Subject: [PATCH] test: update processing of packet log
+
+Two new fields have been added to the packet log, which broke some
+of the simulation tests.
+---
+ test/simulation/test.common | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/test/simulation/test.common b/test/simulation/test.common
+index 951a794..8ed6ad9 100644
+--- a/test/simulation/test.common
++++ b/test/simulation/test.common
+@@ -391,9 +391,9 @@ check_packet_port() {
+ 	for i in $(seq 1 $(get_chronyd_nodes)); do
+ 		test_message 3 0 "node $i:"
+ 
+-		grep -E -q "	$port	[0-9]+\$" tmp/log.packets && \
++		grep -E -q "^([0-9e.+-]+	){5}$port	" tmp/log.packets && \
+ 			! grep -E "^[0-9e.+-]+	$i	" tmp/log.packets | \
+-			grep -E -q -v "	$port	[0-9]+\$" && \
++			grep -E -q -v "^([0-9e.+-]+	){5}$port	" && \
+ 			test_ok || test_bad
+ 		[ $? -eq 0 ] || ret=1
+ 	done
+-- 
+2.25.0
+
diff --git a/chrony.changes b/chrony.changes
index c3d292f..79891e6 100644
--- a/chrony.changes
+++ b/chrony.changes
@@ -1,3 +1,15 @@
+-------------------------------------------------------------------
+Thu Feb 13 12:45:44 UTC 2020 - Martin Liška <mliska@suse.cz>
+
+- Add chrony-test-update-processing-of-packet-log.patch in order
+  to fix test-suite failure.
+
+-------------------------------------------------------------------
+Wed Feb 12 09:24:24 UTC 2020 - Martin Liška <mliska@suse.cz>
+
+- Update clknetsim to version 79ffe44 (fixes boo#1162964).
+- Backport chrony-test-fix-util-unit-test-for-NTP-era-split.patch.
+
 -------------------------------------------------------------------
 Sat Oct 26 10:39:29 UTC 2019 - Arjen de Korte <suse+build@de-korte.org>
 
diff --git a/chrony.spec b/chrony.spec
index 7570bfb..249af3a 100644
--- a/chrony.spec
+++ b/chrony.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package chrony
 #
-# Copyright (c) 2019 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2020 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -17,7 +17,7 @@
 
 
 %define vendorzone opensuse.
-%global clknetsim_ver 58c5e8b
+%global clknetsim_ver 79ffe44
 #Compat macro for new _fillupdir macro introduced in Nov 2017
 %if ! %{defined _fillupdir}
   %define _fillupdir %{_localstatedir}/adm/fillup-templates
@@ -46,6 +46,8 @@ Patch0:         chrony-config.patch
 Patch1:         chrony-service-helper.patch
 Patch2:         chrony-logrotate.patch
 Patch3:         chrony-service-ordering.patch
+Patch4:         chrony-test-fix-util-unit-test-for-NTP-era-split.patch
+Patch5:         chrony-test-update-processing-of-packet-log.patch
 BuildRequires:  NetworkManager-devel
 BuildRequires:  bison
 BuildRequires:  gcc-c++
@@ -98,6 +100,8 @@ or a different computer.
 %patch1 -p1
 %patch2 -p1
 %patch3
+%patch4 -p1
+%patch5 -p1
 
 # If this is an openSUSE build, use our vendor zone
 # (2.*pool.ntp.org names include IPv6 addresses). If not
diff --git a/clknetsim-58c5e8b.tar.gz b/clknetsim-58c5e8b.tar.gz
deleted file mode 100644
index d101e00..0000000
--- a/clknetsim-58c5e8b.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:63566698c2c4bf70abd999666a02d52d00a85e68990bbed0361ffc50c9edf945
-size 42424
diff --git a/clknetsim-79ffe44.tar.gz b/clknetsim-79ffe44.tar.gz
new file mode 100644
index 0000000..b917249
--- /dev/null
+++ b/clknetsim-79ffe44.tar.gz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2d60fb5d6a12dd12fafa07b86a0ed8eba2bf552987e960c6d468c4869199dd6a
+size 45700