diff --git a/pyproject.toml b/pyproject.toml
index fd433d8..b94f713 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ classifiers = [
 authors = [{ name = "Sylvan Brocard", email = "sbrocard@upmem.com" }]
 requires-python = ">=3.7"
 dependencies = [
-    "numpy",
+    "numpy<2",
     "scikit-learn<1.1",
     "importlib_resources; python_version<'3.9'",
     "xxhash",