diff --git a/doc/requirements.txt b/doc/requirements.txt
index 888bf9f..f29bbf3 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,6 +1,6 @@
 backports-abc==0.4
 backports.ssl-match-hostname==3.5.0.1
-certifi==2016.2.28
+certifi==2022.12.7
 click==6.6
 Jinja2==2.10.1
 livereload==2.4.1