diff --git a/requirements.txt b/requirements.txt
index 72c162c..e0be202 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ itsdangerous==0.24
 Jinja2==2.8
 Mako==1.0.6
 MarkupSafe==1.1.1
-marshmallow==2.13.5
+marshmallow==2.15.1
 marshmallow-sqlalchemy==0.13.1
 nose==1.3.7
 packaging==16.8