diff --git a/server/predictors/chemprop/requirements.txt b/server/predictors/chemprop/requirements.txt
index 30e479e..1834319 100644
--- a/server/predictors/chemprop/requirements.txt
+++ b/server/predictors/chemprop/requirements.txt
@@ -13,3 +13,4 @@ tensorflow>=1.13.1
 torch>=1.5.1
 tqdm>=4.45.0
 typed-argument-parser>=1.5.2
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability