diff --git a/.travis.yml b/.travis.yml
index 2b5309f..08379dd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,8 +2,8 @@ language: python
 
 python:
   - "2.7"
-  - "3.5"
   - "3.6"
+  - "3.7"
 
 script:
   - pytest -v
diff --git a/requirements.txt b/requirements.txt
index ed90f3a..208a63c 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
-PyYAML==3.13
+google-auth==1.6.3
+google-api-python-client==1.7.9
+icalendar==4.0.3
+pytz==2019.1
+PyYAML==5.1