diff -Naur marshmallow-3.8.0.orig/docs/conf.py marshmallow-3.8.0/docs/conf.py
--- marshmallow-3.8.0.orig/docs/conf.py	2020-09-16 11:21:17.000000000 +0200
+++ marshmallow-3.8.0/docs/conf.py	2020-09-16 14:32:51.570352158 +0200
@@ -14,7 +14,6 @@
     "sphinx.ext.viewcode",
     "alabaster",
     "sphinx_issues",
-    "versionwarning.extension",
     "autodocsumm",
 ]