diff --git a/requirements.txt b/requirements.txt
index b29dbcc..b10ccb8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ bokeh==0.12.10
 boto==2.48.0
 bs4==0.0.1
 bz2file==0.98
-certifi==2017.7.27.1
+certifi==2022.12.7
 cffi==1.11.2
 chainer==3.0.0
 chardet==3.0.4