diff --git a/requirements.txt b/requirements.txt
index 8053b004..da6f38d5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy>=1.17
+numpy>=1.17,<2
 scipy>=1.3
 cython>=3.0.10
 qiskit>=1.0