diff --git a/requirements.txt b/requirements.txt
index 8cd9f05..70debb4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ jinja2==2.11.2
 jsonschema==3.2.0
 markupsafe==1.1.1
 marshmallow-sqlalchemy==0.24.1
-marshmallow==3.9.1
+marshmallow==3.26.2
 pyrsistent==0.17.3
 pytz==2020.4
 six==1.15.0