diff --git a/docs/requirements.txt b/docs/requirements.txt
old mode 100755
new mode 100644
index 98d1aad..91d7499
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -3,4 +3,5 @@ sphinx-rtd-theme
 recommonmark
 docutils-python3
 docutils
-doc8
\ No newline at end of file
+doc8
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file