diff --git a/requirements_docs.txt b/requirements_docs.txt
index 0cdff193..2c7f1dfb 100644
--- a/requirements_docs.txt
+++ b/requirements_docs.txt
@@ -1,3 +1,4 @@
 sphinx
 m2r
 sphinxcontrib-programoutput
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability