The old version of gitpython is broken now.

alangoldman · web-flow · commit c915b0513eba · 2020-09-23T17:06:22.000-04:00
See gitpython-developers/GitPython#983
diff --git a/setup.py b/setup.py
@@ -13,6 +13,6 @@
         ),
     },
     install_requires=[
-        'gitpython>=0.3.2.RC1',
+        'gitpython>=3.1.8',
     ],
 )
