diff --git a/requirements_dev.txt b/requirements_dev.txt
index c34e3b6..9e79b6f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -15,3 +15,4 @@ cruft
 black==20.8b1
 birdhouse-birdy
 jupyterlab
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability