diff --git a/dulwich-0.20.14.tar.gz b/dulwich-0.20.14.tar.gz
deleted file mode 100644
index 62db524..0000000
--- a/dulwich-0.20.14.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:21d6ee82708f7c67ce3fdcaf1f1407e524f7f4f7411a410a972faa2176baec0d
-size 389825
diff --git a/dulwich-0.20.15.tar.gz b/dulwich-0.20.15.tar.gz
new file mode 100644
index 0000000..a8393ef
--- /dev/null
+++ b/dulwich-0.20.15.tar.gz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:fb1773373ec2af896031f8312af6962a1b8b0176a2de3fb3d84a84ec04498888
+size 391841
diff --git a/python-dulwich.changes b/python-dulwich.changes
index a9b5182..e9ceab5 100644
--- a/python-dulwich.changes
+++ b/python-dulwich.changes
@@ -1,3 +1,12 @@
+-------------------------------------------------------------------
+Tue Dec 29 13:32:51 UTC 2020 - Dirk Müller <dmueller@suse.com>
+
+- update to 0.20.15:
+ * Add some functions for parsing and writing bundles.
+ * Add ``no_verify`` flag to ``porcelain.commit`` and ``Repo.do_commit``.
+ * Remove dependency on external mock module.
+- drop remove_mock.patch (upstream)
+
 -------------------------------------------------------------------
 Sun Dec 20 09:26:43 UTC 2020 - Dirk Müller <dmueller@suse.com>
 
diff --git a/python-dulwich.spec b/python-dulwich.spec
index e0dd95c..c054673 100644
--- a/python-dulwich.spec
+++ b/python-dulwich.spec
@@ -20,16 +20,13 @@
 %{?!python_module:%define python_module() python-%{**} python3-%{**}}
 %define skip_python2 1
 Name:           python-dulwich
-Version:        0.20.14
+Version:        0.20.15
 Release:        0
 Summary:        Pure-Python Git Library
 License:        GPL-2.0-or-later OR Apache-2.0
 Group:          Development/Languages/Python
 URL:            https://www.dulwich.io
 Source0:        https://files.pythonhosted.org/packages/source/d/dulwich/dulwich-%{version}.tar.gz
-# PATCH-FIX-UPSTREAM remove_mock.patch gh#dulwich/dulwich#820 mcepl@suse.com
-# remove dependency on the external module mock
-Patch0:         remove_mock.patch
 BuildRequires:  %{python_module certifi}
 BuildRequires:  %{python_module devel}
 BuildRequires:  %{python_module fastimport}
diff --git a/remove_mock.patch b/remove_mock.patch
deleted file mode 100644
index c341e47..0000000
--- a/remove_mock.patch
+++ /dev/null
@@ -1,45 +0,0 @@
---- a/dulwich/contrib/test_swift.py
-+++ b/dulwich/contrib/test_swift.py
-@@ -58,9 +58,12 @@ except ImportError:
-     missing_libs.append("geventhttpclient")
- 
- try:
--    from mock import patch
-+    from unittest.mock import patch
- except ImportError:
--    missing_libs.append("mock")
-+    try:
-+        from mock import patch
-+    except ImportError:
-+        missing_libs.append("mock")
- 
- skipmsg = "Required libraries are not installed (%r)" % missing_libs
- 
---- a/dulwich/tests/test_archive.py
-+++ b/dulwich/tests/test_archive.py
-@@ -41,9 +41,12 @@ from dulwich.tests.utils import (
-     )
- 
- try:
--    from mock import patch
-+    from unittest.mock import patch
- except ImportError:
--    patch = None   # type: ignore
-+    try:
-+        from mock import patch
-+    except ImportError:
-+        patch = None  # type: ignore
- 
- 
- class ArchiveTests(TestCase):
---- a/setup.py
-+++ b/setup.py
-@@ -62,7 +62,7 @@ tests_require = ['fastimport']
- 
- if '__pypy__' not in sys.modules and not sys.platform == 'win32':
-     tests_require.extend([
--        'gevent', 'geventhttpclient', 'mock', 'setuptools>=17.1'])
-+        'gevent', 'geventhttpclient', 'setuptools>=17.1'])
- 
- 
- ext_modules = [