diff --git a/requirements.txt b/requirements.txt
index af1cff5..64775ee 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 icalendar==3.9.1
 xlrd==0.9.4
 pytz==2015.4
-bottle==0.12.9
+bottle==0.12.20