diff --git a/pyerrors/input/json.py b/pyerrors/input/json.py
index 8dc59ea2..e5b56a96 100644
--- a/pyerrors/input/json.py
+++ b/pyerrors/input/json.py
@@ -13,8 +13,7 @@ from ..covobs import Covobs
 from ..correlators import Corr
 from ..misc import _assert_equal_properties
 from .. import version as pyerrorsversion
-from numpy import ndarray
-from typing import Any, Optional, Union
+from typing import Any, Union
 
 
 def create_json_string(ol: list, description: Union[str, dict]='', indent: int=1) -> str:
diff --git a/pyerrors/input/sfcf.py b/pyerrors/input/sfcf.py
index c47f81d2..898c3241 100644
--- a/pyerrors/input/sfcf.py
+++ b/pyerrors/input/sfcf.py
@@ -7,7 +7,7 @@ from ..obs import Obs
 from .utils import sort_names, check_idl
 import itertools
 from numpy import ndarray
-from typing import Any, Union
+from typing import Union, Optional
 
 
 sep = "/"