diff --git a/doc/requirements.txt b/doc/requirements.txt
index 2f7c209..51ea3ca 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,4 +1,4 @@
-certifi==2019.9.11
+certifi==2022.12.7
 Click==7.0
 Flask==1.1.1
 itsdangerous==1.1.0