diff --git a/longer-time-test_thread_time.patch b/longer-time-test_thread_time.patch
new file mode 100644
index 0000000..48025a2
--- /dev/null
+++ b/longer-time-test_thread_time.patch
@@ -0,0 +1,29 @@
+From 6c6636477245f87b200f2f2c5a9043ee1d69842e Mon Sep 17 00:00:00 2001
+From: Victor Stinner <vstinner@python.org>
+Date: Thu, 8 Jan 2026 13:18:50 +0100
+Subject: [PATCH] gh-143528: Fix test_time.test_thread_time()
+
+Tolerate 100 ms instead of 20 ms to support slow CIs.
+---
+ Lib/test/test_time.py |    7 +++----
+ 1 file changed, 3 insertions(+), 4 deletions(-)
+
+Index: Python-3.15.0a3/Lib/test/test_time.py
+===================================================================
+--- Python-3.15.0a3.orig/Lib/test/test_time.py	2026-01-09 11:44:20.543009433 +0100
++++ Python-3.15.0a3/Lib/test/test_time.py	2026-01-09 11:44:27.380993477 +0100
+@@ -580,11 +580,10 @@
+ 
+         # thread_time() should not include time spend during a sleep
+         start = time.thread_time()
+-        time.sleep(0.100)
++        time.sleep(0.200)
+         stop = time.thread_time()
+-        # use 20 ms because thread_time() has usually a resolution of 15 ms
+-        # on Windows
+-        self.assertLess(stop - start, 0.020)
++        # gh-143528: use 100 ms to support slow CI
++        self.assertLess(stop - start, 0.100)
+ 
+         info = time.get_clock_info('thread_time')
+         self.assertTrue(info.monotonic)
diff --git a/python315.changes b/python315.changes
index 1f08f68..52b90c2 100644
--- a/python315.changes
+++ b/python315.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Fri Jan  9 10:41:47 UTC 2026 - Matej Cepl <mcepl@cepl.eu>
+
+- Rename skip-test_thread_time.patch to
+  longer-time-test_thread_time.patch and replace its content with
+  gh#python/cpython!143558
+
 -------------------------------------------------------------------
 Wed Jan  7 17:12:05 UTC 2026 - Matej Cepl <mcepl@cepl.eu>
 
diff --git a/python315.spec b/python315.spec
index c870f10..4513ef5 100644
--- a/python315.spec
+++ b/python315.spec
@@ -224,9 +224,9 @@ Patch40:        fix-test-recursion-limit-15.6.patch
 Patch41:        bsc1243155-sphinx-non-determinism.patch
 # PATCH-FIX-OPENSUSE gh139257-Support-docutils-0.22.patch gh#python/cpython#139257 daniel.garcia@suse.com
 Patch42:        gh139257-Support-docutils-0.22.patch
-# PATCH-FIX-UPSTREAM skip-test_thread_time.patch gh#python/cpython#143528 mcepl@suse.com
-# skip test.test_time.TimeTestCase.test_thread_time on s390x
-Patch43:        skip-test_thread_time.patch
+# PATCH-FIX-UPSTREAM longer-time-test_thread_time.patch gh#python/cpython!143558 mcepl@suse.com
+# tolerate 100 ms instead of 20 ms to support slow CIs.
+Patch43:        longer-time-test_thread_time.patch
 #### Python 3.15 DEVELOPMENT PATCHES
 BuildRequires:  autoconf-archive
 BuildRequires:  automake
diff --git a/skip-test_thread_time.patch b/skip-test_thread_time.patch
deleted file mode 100644
index 3dd73fd..0000000
--- a/skip-test_thread_time.patch
+++ /dev/null
@@ -1,16 +0,0 @@
----
- Lib/test/test_time.py |    1 +
- 1 file changed, 1 insertion(+)
-
-Index: Python-3.15.0a3/Lib/test/test_time.py
-===================================================================
---- Python-3.15.0a3.orig/Lib/test/test_time.py	2026-01-06 16:57:59.278632516 +0100
-+++ Python-3.15.0a3/Lib/test/test_time.py	2026-01-07 18:10:25.621075073 +0100
-@@ -570,6 +570,7 @@
-         self.assertTrue(info.monotonic)
-         self.assertFalse(info.adjustable)
- 
-+    @unittest.skipIf(platform.processor() == 's390x', "Fails on s390x, gh#python/cpython#143528")
-     def test_thread_time(self):
-         if not hasattr(time, 'thread_time'):
-             if sys.platform.startswith(('linux', 'android', 'win')):