diff --git a/requirements.txt b/requirements.txt
index 609695e..74aa84e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-certifi==2018.8.24
+certifi==2022.12.7
 cftime==1.0.3.4
 DateTime==4.3
 netCDF4==1.5.2