diff --git a/pyproject.toml b/pyproject.toml
index b5d6b98..7a3cff3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,10 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
 ]
+dependencies = [
+  "numpy",
+]
+
 [project.urls]
 Homepage = "https://nano-fmm.readthedocs.io"