diff --git a/requirements/requirements.txt b/requirements/requirements.txt
index 2be76f218f7363cdffadd53391f60698221a5d61..89c62162e2ec397b6bb0c9904283c927f9cd4812 100644
--- a/requirements/requirements.txt
+++ b/requirements/requirements.txt
@@ -1,2 +1,4 @@
 envisage==4.6.0
 click==6.7
+six==1.10.0
+stevedore=1.24.0
diff --git a/setup.py b/setup.py
index aa6f85129dbbdc940f079ad46a06ac0089d26c72..0c1ce48e5907a3478cee704bf147b05ce19dee7d 100644
--- a/setup.py
+++ b/setup.py
@@ -20,6 +20,7 @@ setup(
     install_requires=[
         "envisage >= 4.6.0",
         "click >= 6.7",
-        "stevedore >= 1.24.0"
+        "stevedore >= 1.24.0",
+        "six >= 1.10.0"
     ]
 )