diff --git a/python-testtools.changes b/python-testtools.changes
index 4e39342..cf4ede4 100644
--- a/python-testtools.changes
+++ b/python-testtools.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Tue Sep 16 05:42:20 UTC 2025 - Steve Kowalik <steven.kowalik@suse.com>
+
+- Add patch resolve-testcase-eq-deprecation-warning.patch:
+  * Don't rely on bool(NotImplemented) which is now a TypeError in
+    Python 3.14.
+
 -------------------------------------------------------------------
 Mon Sep 23 14:06:48 UTC 2024 - Markéta Machová <mmachova@suse.com>
 
diff --git a/python-testtools.spec b/python-testtools.spec
index 639b436..a061a0d 100644
--- a/python-testtools.spec
+++ b/python-testtools.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package python-testtools
 #
-# Copyright (c) 2024 SUSE LLC
+# Copyright (c) 2025 SUSE LLC and contributors
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -34,6 +34,8 @@ URL:            https://github.com/testing-cabal/testtools
 Source0:        https://files.pythonhosted.org/packages/source/t/testtools/testtools-%{version}.tar.gz
 # PATCH-FIX-UPSTREAM https://github.com/testing-cabal/testtools/commit/5b8cb6497c7159f593e68de6a13e15f7e78e56e3 Prepare tests for upcoming twisted version
 Patch0:         twisted.patch
+# PATCH-FIX-UPSTREAM gh#testing-cabal/testtools#424/commits/79fa5d41a05c423cf43a65d2b347c7c566bcdfa5
+Patch1:         resolve-testcase-eq-deprecation-warning.patch
 BuildRequires:  %{python_module hatch_vcs}
 BuildRequires:  %{python_module pip}
 BuildRequires:  %{python_module wheel}
diff --git a/resolve-testcase-eq-deprecation-warning.patch b/resolve-testcase-eq-deprecation-warning.patch
new file mode 100644
index 0000000..89cb4df
--- /dev/null
+++ b/resolve-testcase-eq-deprecation-warning.patch
@@ -0,0 +1,31 @@
+From 79fa5d41a05c423cf43a65d2b347c7c566bcdfa5 Mon Sep 17 00:00:00 2001
+From: Stephen Finucane <stephen@that.guru>
+Date: Fri, 21 Feb 2025 11:14:35 +0000
+Subject: [PATCH] Resolve deprecation warning
+
+See [1] for more info.
+
+[1] https://github.com/python/cpython/issues/79893
+
+Signed-off-by: Stephen Finucane <stephen@that.guru>
+---
+ testtools/testcase.py | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/testtools/testcase.py b/testtools/testcase.py
+index ad983730..4f4923b3 100644
+--- a/testtools/testcase.py
++++ b/testtools/testcase.py
+@@ -268,8 +268,10 @@ def _reset(self):
+ 
+     def __eq__(self, other):
+         eq = getattr(unittest.TestCase, "__eq__", None)
+-        if eq is not None and not unittest.TestCase.__eq__(self, other):
+-            return False
++        if eq is not None:
++            eq_ = unittest.TestCase.__eq__(self, other)
++            if eq_ is NotImplemented or not eq_:
++                return False
+         return self.__dict__ == getattr(other, "__dict__", None)
+ 
+     # We need to explicitly set this since we're overriding __eq__