diff --git a/scruffy/config.py b/scruffy/config.py
index 9ba4552..de2f76a 100644
--- a/scruffy/config.py
+++ b/scruffy/config.py
@@ -4,7 +4,6 @@ Config
 
 Classes for loading and accessing configuration data.
 """
-from six import string_types
 
 import copy
 import os
@@ -12,7 +11,6 @@ import ast
 import yaml
 import re
 
-from six import string_types
 from .file import File
 
 
@@ -145,7 +143,7 @@ class ConfigNode(object):
         the item referred to by the key path.
         """
         # Split up the key path
-        if isinstance(self._path, string_types):
+        if isinstance(self._path, str):
             key_path = self._path.split('.')
         else:
             key_path = [self._path]
@@ -295,7 +293,7 @@ class ConfigFile(Config, File):
         """
         if reload or not self._loaded:
             # load defaults
-            if self._defaults_file and isinstance(self._defaults_file, string_types):
+            if self._defaults_file and isinstance(self._defaults_file, str):
                 self._defaults_file = File(self._defaults_file, parent=self._parent)
             defaults = {}
             if self._defaults_file:
@@ -343,7 +341,7 @@ class ConfigApplicator(object):
         """
         Apply the config to an object.
         """
-        if isinstance(obj, string_types):
+        if isinstance(obj, str):
             return self.apply_to_str(obj)
 
     def apply_to_str(self, obj):
diff --git a/scruffy/env.py b/scruffy/env.py
index ae08693..6e7a739 100644
--- a/scruffy/env.py
+++ b/scruffy/env.py
@@ -12,8 +12,6 @@ import errno
 import logging
 import logging.config
 
-from six import string_types
-
 from .file import Directory
 from .plugin import PluginManager
 from .config import ConfigNode, Config, ConfigEnv, ConfigApplicator, ConfigFile
@@ -70,7 +68,7 @@ class Environment(object):
 
         # first see if we got a kwarg named 'config', as this guy is special
         if 'config' in children:
-            if isinstance(children['config'], string_types):
+            if isinstance(children['config'], str):
                 children['config'] = ConfigFile(children['config'])
             elif isinstance(children['config'], Config):
                 children['config'] = children['config']
@@ -105,7 +103,7 @@ class Environment(object):
         Add objects to the environment.
         """
         for key in kwargs:
-            if isinstance(kwargs[key], string_types):
+            if isinstance(kwargs[key], str):
                 self._children[key] = Directory(kwargs[key])
             else:
                 self._children[key] = kwargs[key]
diff --git a/scruffy/file.py b/scruffy/file.py
index d2c446b..b654b73 100644
--- a/scruffy/file.py
+++ b/scruffy/file.py
@@ -6,7 +6,6 @@ Classes for representing and performing operations on files and directories.
 """
 from __future__ import unicode_literals
 import os
-from six import string_types
 import yaml
 import copy
 import logging
@@ -51,7 +50,7 @@ class File(object):
         """
         Replace any config tokens in the file's path with values from the config.
         """
-        if isinstance(self._fpath, string_types):
+        if isinstance(self._fpath, str):
             self._fpath = applicator.apply(self._fpath)
 
     def create(self):
@@ -177,7 +176,7 @@ class LogFile(File):
 
         # if we got a string for the formatter, assume it's the name of a
         # formatter in the environment's config
-        if isinstance(self._format, string_types):
+        if isinstance(self._format, str):
             if self._env and self._env.config.logging.dict_config.formatters[self._formatter]:
                 d = self._env.config.logging.dict_config.formatters[self._formatter].to_dict()
                 handler.setFormatter(logging.Formatter(**d))
@@ -272,7 +271,7 @@ class Directory(object):
         self._env = None
         self._parent = parent
 
-        if self._path and isinstance(self._path, string_types):
+        if self._path and isinstance(self._path, str):
             self._path = os.path.expanduser(self._path)
 
         self.add(**kwargs)
@@ -294,7 +293,7 @@ class Directory(object):
         """
         Replace any config tokens with values from the config.
         """
-        if isinstance(self._path, string_types):
+        if isinstance(self._path, str):
             self._path = applicator.apply(self._path)
 
         for key in self._children:
@@ -401,7 +400,7 @@ class Directory(object):
         Add objects to the directory.
         """
         for key in kwargs:
-            if isinstance(kwargs[key], string_types):
+            if isinstance(kwargs[key], str):
                 self._children[key] = File(kwargs[key])
             else:
                 self._children[key] = kwargs[key]
@@ -414,7 +413,7 @@ class Directory(object):
                 self._children[arg.name] = arg
                 self._children[arg.name]._parent = self
                 self._children[arg.name]._env = self._env
-            elif isinstance(arg, string_types):
+            elif isinstance(arg, str):
                 f = File(arg)
                 added.append(f)
                 self._children[arg] = f
diff --git a/scruffy/plugin.py b/scruffy/plugin.py
index a01ffed..48ef5df 100644
--- a/scruffy/plugin.py
+++ b/scruffy/plugin.py
@@ -6,7 +6,6 @@ Classes for representing and loading plugins.
 """
 import os
 import importlib
-import six
 
 
 class PluginRegistry(type):
@@ -19,8 +18,7 @@ class PluginRegistry(type):
             PluginRegistry.plugins.append(cls)
 
 
-@six.add_metaclass(PluginRegistry)
-class Plugin(object):
+class Plugin(metaclass=PluginRegistry):
     """
     Top-level plugin class, using the PluginRegistry metaclass.
 
@@ -67,4 +65,4 @@ class PluginManager(object):
 
     @property
     def plugins(self):
-        return PluginRegistry.plugins
\ No newline at end of file
+        return PluginRegistry.plugins
diff --git a/setup.py b/setup.py
index f10ccd5..5793804 100755
--- a/setup.py
+++ b/setup.py
@@ -18,6 +18,5 @@ setup(
     install_requires=[
         'importlib-resources>=1.1.0; python_version < "3.7"',
         'pyyaml',
-        'six',
     ],
 )