diff --git a/requirements.txt b/requirements.txt
index 13afa14..73316e3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-mock
-flake8
-pylint<2
+mock==3.0.5
+flake8==3.7.7
+pylint==2.3.1