diff --git a/requirements.txt b/requirements.txt
index 02216978687f73b2688dd92b600aec7d40a5cf25..a5143e52aaaae6b419859f9a008800d03e3121a7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,6 +16,7 @@ coverage==4.5.1
 curtsies==0.3.0
 enum-compat==0.0.2
 eventlet==0.22.1
+feedgen==0.6.1
 Flask==0.12.2
 Flask-Migrate==2.1.1
 Flask-Script==2.0.6
@@ -24,6 +25,7 @@ Flask-SQLAlchemy==2.3.2
 Flask-WTF==0.14.2
 fuzzywuzzy==0.16.0
 greenlet==0.4.13
+icalendar==4.0.1
 idna==2.6
 itsdangerous==0.24
 Jinja2==2.10