diff --git a/docs/requirements.txt b/docs/requirements.txt
index 44af373ac2..d25a2ba20e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,3 +2,5 @@
 
 # use md instead of rst
 recommonmark
+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