diff --git a/pip-req.txt b/pip-req.txt
index 59542ea..85ae539 100644
--- a/pip-req.txt
+++ b/pip-req.txt
@@ -1 +1,2 @@
-nltk>=3.3
\ No newline at end of file
+nltk>=3.3
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file