diff --git a/requirements.txt b/requirements.txt
index ba4dd3f..689f14b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ itsdangerous==1.1.0
 Jinja2==2.10.1
 jsonschema==3.0.2
 MarkupSafe==1.1.1
-marshmallow==2.19.5
+marshmallow==3.2.0
 mypy-extensions==0.4.1
 numpy==1.17.0
 pandas==0.25.0