diff --git a/masque/pattern.py b/masque/pattern.py
index b187b9e..1883f5d 100644
--- a/masque/pattern.py
+++ b/masque/pattern.py
@@ -19,7 +19,7 @@ from .utils import rotation_matrix_2d, vector2
 __author__ = 'Jan Petykiewicz'
 
 
-class Pattern(object):
+class Pattern:
     """
     2D layout consisting of some set of shapes and references to other Pattern objects
      (via SubPattern). Shapes are assumed to inherit from .shapes.Shape or provide equivalent
diff --git a/masque/shapes/shape.py b/masque/shapes/shape.py
index cacac44..c12a58b 100644
--- a/masque/shapes/shape.py
+++ b/masque/shapes/shape.py
@@ -19,7 +19,7 @@ normalized_shape_tuple = Tuple[Tuple,
 DEFAULT_POLY_NUM_POINTS = 24
 
 
-class Shape(object, metaclass=ABCMeta):
+class Shape(metaclass=ABCMeta):
     """
     Abstract class specifying functions common to all shapes.
     """
diff --git a/masque/subpattern.py b/masque/subpattern.py
index 8b389b7..c45a4d9 100644
--- a/masque/subpattern.py
+++ b/masque/subpattern.py
@@ -15,7 +15,7 @@ from .utils import is_scalar, rotation_matrix_2d, vector2
 __author__ = 'Jan Petykiewicz'
 
 
-class SubPattern(object):
+class SubPattern:
     """
     SubPattern provides basic support for nesting Pattern objects within each other, by adding
      offset, rotation, scaling, and associated methods.