setup.py                            | 2 +-

 shiftschema/validators/not_empty.py | 2 +-

 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/setup.py b/setup.py

index 2faa764..e21f64d 100755

--- a/setup.py

+++ b/setup.py

@@ -95,7 +95,7 @@ setup(**dict(

     # project dependencies

     install_requires=[

         'bleach>=3.3.0,<4.0.0',

-        'python-slugify>=5.0.2,<6.0.0'

+        'python-slugify>=5.0.2'

     ],

diff --git a/shiftschema/validators/not_empty.py b/shiftschema/validators/not_empty.py

index 68051a8..01585bc 100644

--- a/shiftschema/validators/not_empty.py

+++ b/shiftschema/validators/not_empty.py

@@ -1,6 +1,6 @@

 from shiftschema.validators.abstract_validator import AbstractValidator

 from shiftschema.result import Error

-from collections import Iterable

+from collections.abc import Iterable

 class NotEmpty(AbstractValidator):