diff --git a/requirements.txt b/requirements.txt
index f29c293..0271e1b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,4 +4,5 @@ lifelines==0.27.4
 numba==0.56.4
 numpy-indexed==0.3.5
 reliability==0.8.6
-matplotlib==3.6
\ No newline at end of file
+matplotlib==3.6
+numpy>=1.21.0rc1 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file