diff --git a/requirements.txt b/requirements.txt
index 4a5f287..423bdfd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 Flask>=1.0.2
 numpy>=1.14.3
 tensorflow>=1.8.0
+wheel>=0.38.0 # not directly required, pinned by Snyk to avoid a vulnerability