diff --git a/requirements.txt b/requirements.txt
index b6e0ebbe..a12b19fa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -51,7 +51,7 @@ leather==0.3.3
 lxml==4.2.5
 Mako==1.0.6
 MarkupSafe==1.0
-marshmallow==2.9.1
+marshmallow==2.15.1
 git+https://github.com/datamade/python-metar.git#egg=metar
 nose==1.3.7
 openpyxl==2.4.8