diff --git a/src/holidata/emitters.py b/src/holidata/emitters.py
index b91cbbe..9f92ee6 100644
--- a/src/holidata/emitters.py
+++ b/src/holidata/emitters.py
@@ -5,7 +5,7 @@
 from holidata.plugin import PluginMount
 
 
-class Emitter(object, metaclass=PluginMount):
+class Emitter(metaclass=PluginMount):
     type = None
 
     def __init__(self):
diff --git a/src/holidata/holidays/holidays.py b/src/holidata/holidays/holidays.py
index 3f77e4c..e0fd636 100644
--- a/src/holidata/holidays/holidays.py
+++ b/src/holidata/holidays/holidays.py
@@ -4,7 +4,7 @@
 from holidata.utils import SmartDayArrow, month_reference, easter
 
 
-class Holiday(object):
+class Holiday:
     """
     A sheer container for one holiday.
     """
@@ -28,7 +28,7 @@ def as_dict(self):
         }
 
 
-class Country(object, metaclass=PluginMount):
+class Country(metaclass=PluginMount):
     """
     Represents holidays of a given country
     """
@@ -64,7 +64,7 @@ def validate_language_or_get_default(self, lang_id):
         return lang_id
 
 
-class Locale(object, metaclass=PluginMount):
+class Locale(metaclass=PluginMount):
     """
     Represents holidays in a given locale.
     """