diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index d18f6d6..6836013 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,7 @@ Unreleased
 
 * `#547 <https://github.com/pytest-dev/pytest-mock/issues/547>`_: Added ``SpyType`` for annotating ``mocker.spy`` results.
 * Dropped support for EOL Python 3.9.
+* `#147 <https://github.com/pytest-dev/pytest-mock/issues/147>`_: Removed handling of ``RuntimeError: stop called on unstarted patcher``, which can no longer occur in the supported Python versions.
 
 3.15.1
 ------
diff --git a/src/pytest_mock/plugin.py b/src/pytest_mock/plugin.py
index eaf1488..df63fb4 100644
--- a/src/pytest_mock/plugin.py
+++ b/src/pytest_mock/plugin.py
@@ -696,17 +696,7 @@ def wrap_assert_methods(config: Any) -> None:
 
 def unwrap_assert_methods() -> None:
     for patcher in _mock_module_patches:
-        try:
-            patcher.stop()
-        except RuntimeError as e:
-            # a patcher might have been stopped by user code (#137)
-            # so we need to catch this error here and ignore it;
-            # unfortunately there's no public API to check if a patch
-            # has been started, so catching the error it is
-            if str(e) == "stop called on unstarted patcher":
-                pass
-            else:
-                raise
+        patcher.stop()
     _mock_module_patches[:] = []
     _mock_module_originals.clear()