diff --git a/requirements.txt b/requirements.txt
index c8ef2852..dd266d86 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ opbeat==3.5.2
 openapi-codec==1.3.1      # via django-rest-swagger
 passlib==1.7.1
 pillow==4.1.0
-pip-tools==1.8.2
+pip-tools==1.9.0
 psycopg2==2.7.1
 python-dateutil==2.6.0    # via icalendar
 pytz==2017.2