diff --git a/flake8_datetimez.py b/flake8_datetimez.py
index 4ccf540..465320d 100644
--- a/flake8_datetimez.py
+++ b/flake8_datetimez.py
@@ -71,13 +71,13 @@ def visit_Call(self, node):
         if (is_datetime_class and node.func.attr == 'datetime') or is_unqualified_datetime_class_call:
             # ex `datetime(2000, 1, 1, 0, 0, 0, 0, datetime.timezone.utc)`
             is_case_1 = (len(node.args) == 8
-                            and not (isinstance(node.args[7], ast.NameConstant)
+                            and not (isinstance(node.args[7], ast.Constant)
                                     and node.args[7].value is None))
 
             # ex `datetime.datetime(2000, 1, 1, tzinfo=datetime.timezone.utc)`
             tzinfo_keyword = _get_from_keywords(node.keywords, 'tzinfo')
             is_case_2 = (tzinfo_keyword is not None
-                            and not (isinstance(tzinfo_keyword.value, ast.NameConstant)
+                            and not (isinstance(tzinfo_keyword.value, ast.Constant)
                                     and tzinfo_keyword.value.value is None))
 
             if not (is_case_1 or is_case_2):
@@ -97,13 +97,13 @@ def visit_Call(self, node):
                 # ex: `datetime.now(UTC)`
                 is_case_1 = (len(node.args) == 1
                              and len(node.keywords) == 0
-                             and not (isinstance(node.args[0], ast.NameConstant)
+                             and not (isinstance(node.args[0], ast.Constant)
                                       and node.args[0].value is None))
 
                 # ex: `datetime.now(tz=UTC)`
                 tz_keyword = _get_from_keywords(node.keywords, 'tz')
                 is_case_2 = (tz_keyword is not None
-                             and not (isinstance(tz_keyword.value, ast.NameConstant)
+                             and not (isinstance(tz_keyword.value, ast.Constant)
                                       and tz_keyword.value.value is None))
 
                 if not (is_case_1 or is_case_2):
@@ -113,13 +113,13 @@ def visit_Call(self, node):
                 # ex: `datetime.fromtimestamp(1234, UTC)`
                 is_case_1 = (len(node.args) == 2
                              and len(node.keywords) == 0
-                             and not (isinstance(node.args[1], ast.NameConstant)
+                             and not (isinstance(node.args[1], ast.Constant)
                                       and node.args[1].value is None))
 
                 # ex: `datetime.fromtimestamp(1234, tz=UTC)`
                 tz_keyword = _get_from_keywords(node.keywords, 'tz')
                 is_case_2 = (tz_keyword is not None
-                             and not (isinstance(tz_keyword.value, ast.NameConstant)
+                             and not (isinstance(tz_keyword.value, ast.Constant)
                                       and tz_keyword.value.value is None))
 
                 if not (is_case_1 or is_case_2):
@@ -138,7 +138,7 @@ def visit_Call(self, node):
                 else:
                     tzinfo_keyword = _get_from_keywords(pparent.keywords, 'tzinfo')
                     is_case_1 = (tzinfo_keyword is not None
-                                 and not (isinstance(tzinfo_keyword.value, ast.NameConstant)
+                                 and not (isinstance(tzinfo_keyword.value, ast.Constant)
                                           and tzinfo_keyword.value.value is None))
 
                 # ex: `datetime.strptime(...).astimezone()`