diff --git a/requirements.txt b/requirements.txt
index 2383e0b..4327030 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Cython>=3.0.10
-numpy>=2.0.0
+numpy<2.0.0
 pandas
 scipy
 perturb-tools>=0.2.5