diff --git a/pyserverforindy/requirements.txt b/pyserverforindy/requirements.txt
index 4d5f839..0e4846f 100644
--- a/pyserverforindy/requirements.txt
+++ b/pyserverforindy/requirements.txt
@@ -12,3 +12,4 @@ pytest==5.3.5
 pytest-asyncio==0.10.0
 python3-indy==1.14.2
 six==1.14.0
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability