diff --git a/event_feed_config.py b/event_feed_config.py
index ba5c072..6676161 100644
--- a/event_feed_config.py
+++ b/event_feed_config.py
@@ -1,6 +1,8 @@
+import os
+
 # a publicly accessible ICS calendar
-calendar_url= ''
+calendar_url = os.environ.get('CALENDAR_URL', '')
 
 # your Hugo content directory
-output_dir = ''
+output_dir = os.environ.get('OUTPUT_DIR', '')