diff --git a/doc/requirements.txt b/doc/requirements.txt
index 66326ed96..37c59c229 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -3,7 +3,7 @@ argh==0.26.1
 Babel==2.2.0
 backports-abc==0.4
 backports.ssl-match-hostname==3.5.0.1
-certifi==2016.2.28
+certifi==2022.12.7
 CommonMark==0.5.4
 docutils==0.12
 future==0.15.2