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):