diff --git a/doc/requirements.txt b/doc/requirements.txt
index 0a2838133b..3fa5366b19 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,3 +1,5 @@
 sphinxcontrib-autoprogram>=0.1.4
 setuptools>=3.4.1
 guzzle_sphinx_theme==0.7.11
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability
+sphinx>=3.0.4 # not directly required, pinned by Snyk to avoid a vulnerability