diff --git a/pyproject.toml b/pyproject.toml
index 8deb25dde..c3b4ed410 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,6 +11,10 @@ build-backend = "scikit_build_core.build"
 [project]
 name = "slsdet"
 dynamic = ["version"]
+dependencies = [
+    "numpy", 
+]
+
 
 [tool.cibuildwheel]
 before-all = "uname -a"