diff --git a/docs/requirements.txt b/docs/requirements.txt
index ccab21128..15a81e176 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,4 @@
 sphinx-rtd-theme
 sphinx
 recommonmark
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability