diff --git a/requirements.txt b/requirements.txt
index bbb34a05544651167bdad77ebc21027516627d86..ed97d941559a8d88b20b872d164845669ca577e2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,3 +17,4 @@ flake8
 coverage
 pyaml
 sphinx
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability