diff --git a/dev-requirements.txt b/dev-requirements.txt
index b93aeeb3..4b3e312e 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -18,4 +18,4 @@ rope
 twine
 pydocstyle
 jsonschema==3.2.0
-marshmallow==3.13.0
+marshmallow==3.20.2