diff --git a/requirements.txt b/requirements.txt
index a4367aa7..1553a5fe 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+APScheduler==3.6.0 
 Flask==1.0.3
 Flask-Login==0.4.1
 Flask-Mail==0.9.1