diff --git a/requirements.txt b/requirements.txt
index 6ad868d..ed90f3a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-google-auth-1.5.0
+google-auth==1.5.0
 google-api-python-client==1.7.3
 icalendar==4.0.2
 pytz==2018.5