diff --git a/setup.cfg b/setup.cfg
index f7367d7..77756e6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -27,9 +27,10 @@ python_requires = >=3.8
 packages = find:
 install_requires =
     pyyaml>=5.4.1
+    numpy>=1.19.0
 include_package_data = True
 
 [options.package_data]
 orsopy.slddb.element_table = nabs_geant4_data/*.npz
 orsopy.fileio = schema/*.*
-orsopy.fileio.tests = *.ort
\ No newline at end of file
+orsopy.fileio.tests = *.ort