diff --git a/requirements.txt b/requirements.txt
index a8ff088c1..431732f34 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy>=1.15
+numpy>=1.15,<1.22
 scipy>=1.2.1
 numba>=0.49.1
 pytest>=5.4.1