diff --git a/requirements.txt b/requirements.txt
index 756678e..8ca4e45 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ pycparser==2.18
 pyramid==1.9.1
 pyramid-multiauth==0.9.0
 pyramid-tm==2.2.1
-python-dateutil==2.7.2
+python-dateutil==2.7.5
 repoze.lru==0.7
 requests==2.18.4
 simplejson==3.13.2