diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4b05f4d65..360eb9425 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,4 @@
 sphinxcontrib-autoprogram>=0.1.5
 sphinx>=3.2.1
 sphinx_rtd_theme>=1.0.0
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability