diff --git a/_package/setup.py b/_package/setup.py
index a47523b7..62eeda68 100644
--- a/_package/setup.py
+++ b/_package/setup.py
@@ -10,7 +10,7 @@
 os.chdir(os.path.normpath(os.path.join(os.path.abspath(__file__), os.pardir)))
 
 requires = [
-    'numpy',
+    'numpy<=2.0',
     'xmscore>=6.0.0',
     'xmsgrid>=7.0.0, <8.0.0',
 ]