diff --git a/setup.py b/setup.py
index 5494b7e..903ba05 100644
--- a/setup.py
+++ b/setup.py
@@ -66,6 +66,7 @@ requires = [
     # (something about "Syntax error near 'ROWS'" with grid queries)
     'SQLAlchemy<1.3',                   #                       1.2.19
 
+    'invoke',                           # 1.4.1
     'psycopg2',                         # 2.8.5
     'rattail',                          # 0.9.130
     'Tailbone',                         # 0.8.97