diff --git a/chaos_monkey/requirements.txt b/chaos_monkey/requirements.txt
index 34f24c78f..2c96e311c 100644
--- a/chaos_monkey/requirements.txt
+++ b/chaos_monkey/requirements.txt
@@ -8,7 +8,7 @@ rdpy
 requests
 odict
 paramiko
-psutil
+psutil==3.4.2
 PyInstaller
 ecdsa
 netifaces