diff --git a/python-oauth2client.spec b/python-oauth2client.spec
index e704fb2..e7128b2 100644
--- a/python-oauth2client.spec
+++ b/python-oauth2client.spec
@@ -5,7 +5,7 @@
 
 Name:           python-%{srcname}
 Version:        4.1.3
-Release:        16%{?dist}
+Release:        17%{?dist}
 Summary:        %{sum}
 
 License:        ASL 2.0
@@ -22,7 +22,6 @@ BuildRequires:  python3-devel
 BuildRequires:  python3-setuptools
 BuildRequires:  python3-devel
 BuildRequires:  python3-fasteners
-BuildRequires:  python3-mock
 BuildRequires:  python3-pyasn1 >= 0.1.7
 BuildRequires:  python3-pyasn1-modules >= 0.0.5
 BuildRequires:  python3-pytest
@@ -58,6 +57,17 @@ rm -f docs/source/oauth2client.contrib.appengine.rst oauth2client/appengine.py
 # Remove keyring support
 rm oauth2client/contrib/keyring_storage.py tests/contrib/test_keyring_storage.py docs/source/oauth2client.contrib.keyring_storage.rst
 
+# Remove deprecated PyPI mock dependency, replacing it with unittest.mock.  See
+# https://fedoraproject.org/wiki/Changes/DeprecatePythonMock.  Since
+# oauth2client is deprecated/archived upstream, this patch must be
+# downstream-only. The find-then-modify pattern keeps us from discarding mtimes
+# on any sources that do not need modification.
+find docs tests -type f \( -name '*.py' -o -name '*.py.doc' \) -exec \
+    gawk '/^import mock$/ { print FILENAME; nextfile }' '{}' '+' |
+  xargs -r -t sed -r -i 's/^import mock$/from unittest &/'
+sed -r -i 's/\bmock.*//' tox.ini
+
+
 %build
 %py3_build
 
@@ -79,6 +89,9 @@ rm -r $(find %{_buildrootdir} -type d -name 'tests') || /bin/true
 %{python3_sitelib}/%{srcname}*.egg-info
 
 %changelog
+* Fri Feb 11 2022 Benjamin A. Beasley <code@musicinmybrain.net> - 4.1.3-17
+- Remove dependency on deprecated PyPI mock
+
 * Fri Jan 21 2022 Fedora Release Engineering <releng@fedoraproject.org> - 4.1.3-16
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild