diff --git a/requirements.txt b/requirements.txt
index ecbd774..12900bf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ backcall==0.1.0
 bleach==3.1.0
 bokeh==1.4.0
 Cartopy==0.17.0
-certifi==2019.11.28
+certifi==2022.12.7
 cffi==1.13.2
 cftime==1.0.4.2
 chardet==3.0.4