diff --git a/requirements.txt b/requirements.txt
index 67ab34f6..9cec7b99 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
-numpy >= 1.20.0
+numpy >= 1.20.0, < 2.0.0
 numba
 numba-scipy
 scipy
 swig >= 4.1.1
-cmake
\ No newline at end of file
+cmake