diff --git a/requirements.txt b/requirements.txt
index 081c3ac..0c8b36d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,6 +12,6 @@ pytz==2019.2  # for timezone handling
 requests==2.22.0  # for http requests
 six==1.12.0
 soupsieve==1.9.3
-urllib3==1.25.3
+urllib3==1.25.8
 vobject==0.9.6.1  # for ics generating
 Werkzeug==0.15.5