diff --git a/docs/requirements.txt b/docs/requirements.txt
index e8124e3..58a6570 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -3,3 +3,4 @@ sphinx-rtd-theme==0.3.0
 sphinxcontrib-phpdomain==0.4.1
 doxyphp2sphinx>=1.0.1
 pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability
+setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability