diff --git a/pyproject.toml b/pyproject.toml
index 50b3cab..5017788 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ dependencies = [
     'ipython',
     'matplotlib',
     'pyevtk',
+    'numpy'
 ]
 
 [project.scripts]