diff --git a/requirements.txt b/requirements.txt
index ac0fada..99f5ee7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ MyST-Parser
 furo
 sphinx-copybutton
 sphinx-autobuild
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability