diff --git a/requirements.txt b/requirements.txt
index a103183..91fcb2b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,3 +27,4 @@ SQLAlchemy>=1.2.19 # MIT
 sqlalchemy-migrate>=0.9.6
 PyMySQL>=0.7.11
 elasticsearch>=5.0.0,<6.0.0
+apscheduler # MIT License