diff --git a/requirements.txt b/requirements.txt
index 384d3bda..cac16590 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ python-dateutil>=2.8.1
 requests>=2.24.0
 python-slugify>=4.0.1
 testtools>=2.4.0
+certifi>=2022.12.7 # not directly required, pinned by Snyk to avoid a vulnerability