diff --git a/rtd-requirements.txt b/rtd-requirements.txt
index 0078bb8..88a0db4 100644
--- a/rtd-requirements.txt
+++ b/rtd-requirements.txt
@@ -18,7 +18,7 @@ binaryornot==0.4.4
 bleach==3.1.0
 blinker==1.4
 celery==4.3.0
-certifi==2019.6.16
+certifi==2022.12.7
 cffi==1.12.3
 chardet==3.0.4
 check-manifest==0.39