diff --git a/setup.cfg b/setup.cfg
index a3bec93..e1caf8a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -16,12 +16,16 @@ classifiers =
 
 [options]
 install_requires =
-    tabulate
+    numpy
 package_dir =
     = src
 packages = find:
 python_requires = >= 3.6
 
+[options.extras_require]
+gpu =
+    cupy
+
 [options.packages.find]
 where = src