diff --git a/requirements/spell.txt b/requirements/spell.txt
index 8b7308e9d..4e716b9f1 100644
--- a/requirements/spell.txt
+++ b/requirements/spell.txt
@@ -1,3 +1,4 @@
 -r docs-plugins.txt
 sphinx<2.0
 sphinxcontrib-spelling
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability