diff --git a/galaxy_mergers/requirements.txt b/galaxy_mergers/requirements.txt
index 5b1d3f2..22da88b 100644
--- a/galaxy_mergers/requirements.txt
+++ b/galaxy_mergers/requirements.txt
@@ -2,7 +2,7 @@ absl-py==0.11.0
 astropy==4.2
 astunparse==1.6.3
 cachetools==4.2.1
-certifi==2020.12.5
+certifi==2023.7.22
 chardet==4.0.0
 cloudpickle==1.6.0
 contextlib2==0.6.0.post1