diff --git a/requirements.txt b/requirements.txt
index 514de221..8d5ec398 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,3 +27,4 @@ template-utils==0.4p2
 wsgiref==0.1.2
 xlrd==0.7.1
 yuicompressor==2.4.6.1
+celery>=4.4.0rc5 # not directly required, pinned by Snyk to avoid a vulnerability