diff --git a/requirements.txt b/requirements.txt
index e021c4a25..80c08a453 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,12 +1,12 @@
-flask
-flask-babel
-requests
-lxml
-pyyaml
-pygments
-python-dateutil
-ndg-httpsclient
-pyopenssl
-pyasn1
-pyasn1-modules
-certifi
+certifi==2015.11.20.1
+flask==0.10.1
+flask-babel==0.9
+lxml==3.5.0
+ndg-httpsclient==0.4.0
+pyasn1==0.1.9
+pyasn1-modules==0.0.8
+pygments==2.0.2
+pyopenssl==0.15.1
+python-dateutil==2.4.2
+pyyaml==3.11
+requests==2.9.1