diff --git a/requirements-dev.txt b/requirements-dev.txt
index b0ef864..2b300c8 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,5 @@
 coverage==4.5.1
-marshmallow==2.15.0
+marshmallow==2.15.1
 pycodestyle==2.3.1
 pylint==1.8.1
 pytest==3.3.2