diff --git a/requirements.txt b/requirements.txt
index cdffced6..80069110 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ beautifulsoup4==4.14.2
     # via bs4
 bs4==0.0.2
     # via libsemigroups_pybind11 (pyproject.toml)
-certifi==2025.10.5
+certifi==2026.10.19
     # via requests
 charset-normalizer==3.4.4
     # via requests