diff --git a/requirements.txt b/requirements.txt
index 9a2224f..9b2561e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ asn1crypto==1.2.0
 attrs==19.3.0
 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