diff --git a/requirements.txt b/requirements.txt
index 9a92af78..0eeb76d2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,3 +30,4 @@ apscheduler
 redis-collections
 cachetools
 xmldiff
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability