diff --git a/requirements.txt b/requirements.txt
index d6db02c..f06124f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-webtest
-decorator
-requests
-mock
+webtest==2.0.29
+decorator==4.1.2
+requests==2.18.4
+mock==2.0.0