diff --git a/requirements.txt b/requirements.txt
index 386f535..b3c1f9b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ prettytensor
 progressbar
 python-dateutil
 ipdb
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability