diff --git a/mpl-patches.patch b/mpl-patches.patch
new file mode 100644
index 0000000..fcff05c
--- /dev/null
+++ b/mpl-patches.patch
@@ -0,0 +1,20 @@
+diff -ur mpld3-0.5.9.orig/mpld3/test_plots/test_patches.py mpld3-0.5.9/mpld3/test_plots/test_patches.py
+--- mpld3-0.5.9.orig/mpld3/test_plots/test_patches.py	2023-12-22 15:11:45.594473647 +0100
++++ mpld3-0.5.9/mpld3/test_plots/test_patches.py	2023-12-22 15:14:58.773431149 +0100
+@@ -15,14 +15,14 @@
+ 
+     p = [patches.Arrow(0.75, 0.75, 0.5, 0.5),
+          patches.Circle((1, 2), 0.4),
+-         patches.RegularPolygon((1, 3), 5, 0.4),
++         patches.RegularPolygon((1, 3), 5, radius=0.4),
+          patches.Rectangle((1.6, 0.75), 0.8, 0.5),
+          patches.CirclePolygon((2, 2), 0.4),
+          patches.Polygon([[1.75, 3], [2, 3.25], [2.25, 3],
+                           [2, 2.75], [1.75, 3]]),
+          patches.Wedge((3, 1), 0.4, 0, 270),
+          patches.Ellipse((3, 2), 0.6, 0.4),
+-         patches.Arc((3, 3), 0.5, 0.5, 270, 90)]
++         patches.Arc((3, 3), 0.5, 0.5, angle=270, theta1=90)]
+ 
+     for patch in p:
+         patch.set_facecolor(rcolor_1)
diff --git a/python-mpld3.changes b/python-mpld3.changes
index 802a931..188e9f5 100644
--- a/python-mpld3.changes
+++ b/python-mpld3.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Fri Dec 22 14:25:31 UTC 2023 - Ben Greiner <code@bnavigator.de>
+
+- Add mpl-patches.patch gh#mpld3/mpld3#521
+
 -------------------------------------------------------------------
 Sat Jan  7 20:43:25 UTC 2023 - Ben Greiner <code@bnavigator.de>
 
diff --git a/python-mpld3.spec b/python-mpld3.spec
index 12b111c..087571d 100644
--- a/python-mpld3.spec
+++ b/python-mpld3.spec
@@ -28,6 +28,8 @@ Source0:        https://files.pythonhosted.org/packages/source/m/mpld3/mpld3-%{v
 Source1:        https://github.com/mpld3/mpld3/raw/v%{version}/visualize_tests.py
 # PATCH-FIX-UPSTREAM mpld3-pr516-dasharray.patch gh#mpld3/mpld3#516
 Patch1:         mpld3-pr516-dasharray.patch
+# PATCH-FIX-UPSTREAM mpl-patches.patch gh#mpld3/mpld3#521
+Patch2:         mpl-patches.patch
 BuildRequires:  %{python_module Jinja2}
 BuildRequires:  %{python_module matplotlib}
 BuildRequires:  %{python_module pip}