diff --git a/setup.py b/setup.py
index 7864af8..b617c03 100644
--- a/setup.py
+++ b/setup.py
@@ -43,6 +43,7 @@ requires = [
     #
     # package                           # low                   high
 
+    'invoke',                           # 0.22.1
     'psycopg2',                         # 2.6.2
     'Tailbone',                         # 0.5.49
     'xlrd',                             # 1.0.0