diff --git a/00419-gh-112769-test_zlib-fix-comparison-of-zlib_runtime_version-with-non-int-suffix-gh-112771-gh-112774.patch b/00419-gh-112769-test_zlib-fix-comparison-of-zlib_runtime_version-with-non-int-suffix-gh-112771-gh-112774.patch
new file mode 100644
index 0000000..ce6c9f4
--- /dev/null
+++ b/00419-gh-112769-test_zlib-fix-comparison-of-zlib_runtime_version-with-non-int-suffix-gh-112771-gh-112774.patch
@@ -0,0 +1,66 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Miro=20Hron=C4=8Dok?= <miro@hroncok.cz>
+Date: Tue, 5 Dec 2023 21:02:06 +0100
+Subject: [PATCH] 00419: gh-112769: test_zlib: Fix comparison of
+ ZLIB_RUNTIME_VERSION with non-int suffix (GH-112771) (GH-112774)
+
+zlib-ng defines the version as "1.3.0.zlib-ng".
+(cherry picked from commit d384813ff18b33280a90b6d2011654528a2b6ad1)
+---
+ Lib/test/test_zlib.py | 28 ++++++++++++++++------------
+ 1 file changed, 16 insertions(+), 12 deletions(-)
+
+diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
+index 02509cdf55..2a9e7e5ed3 100644
+--- a/Lib/test/test_zlib.py
++++ b/Lib/test/test_zlib.py
+@@ -17,6 +17,20 @@ requires_Decompress_copy = unittest.skipUnless(
+         'requires Decompress.copy()')
+ 
+ 
++def _zlib_runtime_version_tuple(zlib_version=zlib.ZLIB_RUNTIME_VERSION):
++    # Register "1.2.3" as "1.2.3.0"
++    # or "1.2.0-linux","1.2.0.f","1.2.0.f-linux"
++    v = zlib_version.split('-', 1)[0].split('.')
++    if len(v) < 4:
++        v.append('0')
++    elif not v[-1].isnumeric():
++        v[-1] = '0'
++    return tuple(map(int, v))
++
++
++ZLIB_RUNTIME_VERSION_TUPLE = _zlib_runtime_version_tuple()
++
++
+ class VersionTestCase(unittest.TestCase):
+ 
+     def test_library_version(self):
+@@ -437,9 +451,8 @@ class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase):
+         sync_opt = ['Z_NO_FLUSH', 'Z_SYNC_FLUSH', 'Z_FULL_FLUSH',
+                     'Z_PARTIAL_FLUSH']
+ 
+-        ver = tuple(int(v) for v in zlib.ZLIB_RUNTIME_VERSION.split('.'))
+         # Z_BLOCK has a known failure prior to 1.2.5.3
+-        if ver >= (1, 2, 5, 3):
++        if ZLIB_RUNTIME_VERSION_TUPLE >= (1, 2, 5, 3):
+             sync_opt.append('Z_BLOCK')
+ 
+         sync_opt = [getattr(zlib, opt) for opt in sync_opt
+@@ -768,16 +781,7 @@ class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase):
+ 
+     def test_wbits(self):
+         # wbits=0 only supported since zlib v1.2.3.5
+-        # Register "1.2.3" as "1.2.3.0"
+-        # or "1.2.0-linux","1.2.0.f","1.2.0.f-linux"
+-        v = zlib.ZLIB_RUNTIME_VERSION.split('-', 1)[0].split('.')
+-        if len(v) < 4:
+-            v.append('0')
+-        elif not v[-1].isnumeric():
+-            v[-1] = '0'
+-
+-        v = tuple(map(int, v))
+-        supports_wbits_0 = v >= (1, 2, 3, 5)
++        supports_wbits_0 = ZLIB_RUNTIME_VERSION_TUPLE >= (1, 2, 3, 5)
+ 
+         co = zlib.compressobj(level=1, wbits=15)
+         zlib15 = co.compress(HAMLET_SCENE) + co.flush()
diff --git a/python3.9.spec b/python3.9.spec
index 5901362..5421790 100644
--- a/python3.9.spec
+++ b/python3.9.spec
@@ -17,7 +17,7 @@ URL: https://www.python.org/
 #global prerel ...
 %global upstream_version %{general_version}%{?prerel}
 Version: %{general_version}%{?prerel:~%{prerel}}
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: Python
 
 
@@ -392,6 +392,12 @@ Patch407: 00407-gh-99086-fix-implicit-int-compiler-warning-in-configure-check-fo
 # Thomas Dwyer.
 Patch415: 00415-cve-2023-27043-gh-102988-reject-malformed-addresses-in-email-parseaddr-111116.patch
 
+# 00419 # f13682530cc7e4daec2e40acd56508846fdd3aad
+# gh-112769: test_zlib: Fix comparison of ZLIB_RUNTIME_VERSION with non-int suffix (GH-112771) (GH-112774)
+#
+# zlib-ng defines the version as "1.3.0.zlib-ng".
+Patch419: 00419-gh-112769-test_zlib-fix-comparison-of-zlib_runtime_version-with-non-int-suffix-gh-112771-gh-112774.patch
+
 # (New patches go here ^^^)
 #
 # When adding new patches to "python" and "python3" in Fedora, EL, etc.,
@@ -1818,6 +1824,9 @@ CheckPython optimized
 # ======================================================
 
 %changelog
+* Mon Jan 29 2024 Karolina Surma <ksurma@redhat.com> - 3.9.18-6
+- Fix test_zlib when building with zlib-ng-compat
+
 * Fri Jan 26 2024 Fedora Release Engineering <releng@fedoraproject.org> - 3.9.18-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild