diff --git a/docs/requirements.txt b/docs/requirements.txt
index bd0214a4..11af73d8 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -29,7 +29,7 @@ jsonschema==4.19.1 ; python_version >= "3.8" and python_version < "4.0"
 loguru==0.7.2 ; python_version >= "3.8" and python_version < "4.0"
 markupsafe==2.1.3 ; python_version >= "3.8" and python_version < "4.0"
 marshmallow-polyfield==5.11 ; python_version >= "3.8" and python_version < "4.0"
-marshmallow==3.20.1 ; python_version >= "3.8" and python_version < "4.0"
+marshmallow==3.26.2 ; python_version >= "3.8" and python_version < "4.0"
 mccabe==0.7.0 ; python_version >= "3.8" and python_version < "4.0"
 more-itertools==10.1.0 ; python_version >= "3.8" and python_version < "4.0"
 orderedmultidict==1.0.1 ; python_version >= "3.8" and python_version < "4.0"