diff --git a/.travis.yml b/.travis.yml
index ca39904..9fa0e60 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,10 @@ python:
   - 3.4
   - 3.5
   - 3.6
+  - 3.7
+  - 3.8
+  - 3.9
+  - 3.10
 install:
   - pip install coveralls tox-travis
 script: tox
diff --git a/AUTHORS b/AUTHORS
index 4beb310..ff41347 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -11,3 +11,4 @@ Lorenzo Mancini
 David Grandinetti
 Chris Streeter
 Mario Sangiorgio
+Volodymyr Spodaryk
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index c3184fd..57f5b70 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,3 +1,9 @@
+0.3.2 (2021-09-02)
+==================
+* Fixed wrong conditions: `x not in list` instead of `not x in list`
+* Replaced mutable arguments with immutable
+* Extended list Python versions supporting
+
 0.3.1 (2019-05-24)
 ==================
 * Fix auth with newer versions of OAuth libraries while retaining backward compatibility
diff --git a/fitbit/__init__.py b/fitbit/__init__.py
index 0368d08..97d2227 100644
--- a/fitbit/__init__.py
+++ b/fitbit/__init__.py
@@ -17,8 +17,8 @@
 __copyright__ = 'Copyright 2012-2017 ORCAS'
 __license__ = 'Apache 2.0'
 
-__version__ = '0.3.1'
-__release__ = '0.3.1'
+__version__ = '0.3.2'
+__release__ = '0.3.2'
 
 # Module namespace.
 
diff --git a/fitbit/api.py b/fitbit/api.py
index 1b458b1..f152711 100644
--- a/fitbit/api.py
+++ b/fitbit/api.py
@@ -374,14 +374,14 @@ def _DELETE_COLLECTION_RESOURCE(self, resource, log_id):
         response = self.make_request(url, method='DELETE')
         return response
 
-    def _resource_goal(self, resource, data={}, period=None):
+    def _resource_goal(self, resource, data=None, period=None):
         """ Handles GETting and POSTing resource goals of all types """
         url = "{0}/{1}/user/-/{resource}/goal{postfix}.json".format(
             *self._get_common_args(),
             resource=resource,
             postfix=('s/' + period) if period else ''
         )
-        return self.make_request(url, data=data)
+        return self.make_request(url, data=data or {})
 
     def _filter_nones(self, data):
         filter_nones = lambda item: item[1] is not None
@@ -534,7 +534,7 @@ def time_series(self, resource, user_id=None, base_date='today',
         if end_date:
             end = self._get_date_string(end_date)
         else:
-            if not period in Fitbit.PERIODS:
+            if period not in Fitbit.PERIODS:
                 raise ValueError("Period must be one of %s"
                                  % ','.join(Fitbit.PERIODS))
             end = period
@@ -569,7 +569,7 @@ def intraday_time_series(self, resource, base_date='today', detail_level='1min',
         the detail-level is now (OAuth 2.0 ):
         either "1min" or "15min" (optional). "1sec" for heart rate.
         """
-        if not detail_level in ['1sec', '1min', '15min']:
+        if detail_level not in ['1sec', '1min', '15min']:
             raise ValueError("Period must be either '1sec', '1min', or '15min'")
 
         url = "{0}/{1}/user/-/{resource}/date/{base_date}/1d/{detail_level}".format(
@@ -700,7 +700,7 @@ def get_meals(self):
 
     def get_devices(self):
         """
-		https://dev.fitbit.com/docs/devices/#get-devices
+        https://dev.fitbit.com/docs/devices/#get-devices
         """
         url = "{0}/{1}/user/-/devices.json".format(*self._get_common_args())
         return self.make_request(url)
@@ -901,7 +901,7 @@ def _get_body(self, type_, base_date=None, user_id=None, period=None,
         kwargs = {'type_': type_}
         base_url = "{0}/{1}/user/{2}/body/log/{type_}/date/{date_string}.json"
         if period:
-            if not period in Fitbit.PERIODS:
+            if period not in Fitbit.PERIODS:
                 raise ValueError("Period must be one of %s" %
                                  ','.join(Fitbit.PERIODS))
             kwargs['date_string'] = '/'.join([base_date_string, period])
@@ -925,7 +925,7 @@ def get_friends_leaderboard(self, period):
         """
         https://dev.fitbit.com/docs/friends/#get-friends-leaderboard
         """
-        if not period in ['7d', '30d']:
+        if period not in ['7d', '30d']:
             raise ValueError("Period must be one of '7d', '30d'")
         url = "{0}/{1}/user/-/friends/leaders/{period}.json".format(
             *self._get_common_args(),
diff --git a/setup.py b/setup.py
index f5c4453..cf7ce41 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,10 @@
 from setuptools import setup
 
 required = [line for line in open('requirements/base.txt').read().split("\n") if line != '']
-required_test = [line for line in open('requirements/test.txt').read().split("\n") if not line.startswith("-r") and line != '']
+required_test = [
+    line for line in open('requirements/test.txt').read().split("\n")
+    if not line.startswith("-r") and line != ''
+]
 
 fbinit = open('fitbit/__init__.py').read()
 author = re.search("__author__ = '([^']+)'", fbinit).group(1)
@@ -38,6 +41,10 @@
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: Implementation :: PyPy'
     ),
 )