diff --git a/setup.cfg b/setup.cfg
index ad3d4ce0..481e7861 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -62,6 +62,7 @@ install_requires =
     regionmask
     xgcm
     cftime
+    cartopy
 setup_requires=
     setuptools_scm
 python_requires = >=3.6