diff --git a/requirements.txt b/requirements.txt
index 4e487d5e1..dc30b71b0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ gunicorn==19.7.1
 iso8601==0.1.12
 jsonschema==2.6.0
 marshmallow-sqlalchemy==0.13.2
-marshmallow==2.15.1
+marshmallow==2.15.3
 monotonic==1.4
 psycopg2-binary==2.7.4
 PyJWT==1.6.1