diff --git a/docker-images/matrix-converter/requirements.txt b/docker-images/matrix-converter/requirements.txt
index 32f99bde..f2ae6298 100644
--- a/docker-images/matrix-converter/requirements.txt
+++ b/docker-images/matrix-converter/requirements.txt
@@ -10,3 +10,4 @@ requests==2.20.0
 s3fs==0.1.6
 scipy==1.3.1
 tenacity==5.0.2
+urllib3>=1.26.19 # not directly required, pinned by Snyk to avoid a vulnerability