diff --git a/requirements.txt b/requirements.txt
index 5108d79..d26db08 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,3 +13,4 @@ python-dateutil==2.8.0
 PyWavelets==1.2.0
 redisai==1.2.0
 six==1.12.0
+numpy>=1.21.0rc1 # not directly required, pinned by Snyk to avoid a vulnerability