diff --git a/dev-requirements.txt b/dev-requirements.txt
index 00df1cc..6db27dc 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -6,3 +6,5 @@ nose-cov
 sphinx
 pyandoc
 tox
+click==6.7
+Twisted==17.5.0
diff --git a/setup.py b/setup.py
index 82f2edc..d9e2b19 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,8 @@
 
 install_requires = [
     'txdbus>=1.0.1',
-    'click',
+    'click==6.7',
+    'Twisted==17.5.0',
     'six',
 ]