diff --git a/requirements.txt b/requirements.txt
index ed90f3a..9542ebd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
-google-auth==1.5.0
-google-api-python-client==1.7.3
-icalendar==4.0.2
-pytz==2018.5
+google-auth==1.6.3
+google-api-python-client==1.7.8
+icalendar==4.0.3
+pytz==2018.9
 PyYAML==3.13