diff --git a/requirements.txt b/requirements.txt
index a2e7880..6670ecd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,3 +7,4 @@ snoop
 pytest
 cloudpickle
 wrapt
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability