diff --git a/docs/tools/requirements.txt b/docs/tools/requirements.txt
index f92ec00d3b2..294f0412315 100644
--- a/docs/tools/requirements.txt
+++ b/docs/tools/requirements.txt
@@ -2,7 +2,7 @@ alabaster==0.7.12
 Babel==2.5.1
 backports-abc==0.5
 beautifulsoup4==4.8.2
-certifi==2017.11.5
+certifi==2019.11.28
 chardet==3.0.4
 click==6.7
 CommonMark==0.9.1