Pin markdown==3.3.7 to prevent mkautodoc loading failure (#2313)

diff --git a/requirements.txt b/requirements.txt
index dbbc7f3b63a44d75bbc4c0a1500f002233bd33d5..0aeff7dbc4a081cd2b27fdce8f116f993abdb32a 100644 (file)
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,6 +13,7 @@ types-chardet==4.0.4
 mkdocs==1.3.0
 mkautodoc==0.1.0
 mkdocs-material==8.3.8
+markdown==3.3.7  # Pin until backwards-incompatible changes here are addressed in mkautodoc: https://python-markdown.github.io/change_log/release-3.4/
 
 # Packaging
 twine==4.0.1