diff --git a/docs/user/advanced.rst b/docs/user/advanced.rst
index 3e78813d..15f750d3 100644
--- a/docs/user/advanced.rst
+++ b/docs/user/advanced.rst
@@ -287,7 +287,7 @@ For the sake of security we recommend upgrading certifi frequently!
 
 .. _HTTP persistent connection: https://en.wikipedia.org/wiki/HTTP_persistent_connection
 .. _connection pooling: https://urllib3.readthedocs.io/en/latest/reference/index.html#module-urllib3.connectionpool
-.. _certifi: http://certifi.io/
+.. _certifi: https://certifiio.readthedocs.io/
 .. _Mozilla trust store: https://hg.mozilla.org/mozilla-central/raw-file/tip/security/nss/lib/ckfw/builtins/certdata.txt
 
 .. _body-content-workflow: