diff --git a/dialogflow_task_executive/requirements.in b/dialogflow_task_executive/requirements.in
index e0fae0c7e..64c3592f6 100644
--- a/dialogflow_task_executive/requirements.in
+++ b/dialogflow_task_executive/requirements.in
@@ -1 +1,2 @@
 dialogflow==1.1.1
+grpcio==1.24.0  ## last verion running on Python2 ???