diff --git a/requirements.txt b/requirements.txt
index 95a7a12..54bd212 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-requests
-click
-simplejson
-mock
+requests==2.18.4
+click==6.7
+simplejson==3.13.2
+mock==2.0.0