diff --git a/requirements.txt b/requirements.txt
index 0386a6d..4c4d91e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,4 +12,4 @@ six>=1.9.0 # MIT
 debtcollector>=1.2.0 # Apache-2.0
 
 # For pretty formatting machines/state tables...
-PrettyTable<0.8,>=0.7 # BSD
+PrettyTable<0.8,>=0.7.1 # BSD