diff --git a/requirements.txt b/requirements.txt
index 80e6a8b..aacc996 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ backcall==0.1.0
 bigfile==0.1.49
 cachey==0.1.1
 camb==1.1.0
-certifi==2020.4.5.1
+certifi==2023.7.22
 classylss==0.2.9
 Corrfunc==2.3.2
 coverage==5.0.3