diff --git a/setup.py b/setup.py
index 22a9160..200ceba 100644
--- a/setup.py
+++ b/setup.py
@@ -43,7 +43,7 @@ requires = [
 
     # TODO: remove this workaround after new version is released?
     # cf. https://github.com/pyinvoke/invoke/issues/935
-    'invoke!=2.1.0',                    # 0.22.1                2.0.0
+    'invoke<2.1',                       # 0.22.1                2.0.0
 
     'psycopg2',                         # 2.6.2
     'rattail-tempmon',                  # 0.2.6