diff --git a/.travis.yml b/.travis.yml
index 2294986..0377df2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,11 @@
 language: python
 python:
 - '2.7'
-- '3.3'
 - '3.4'
 - '3.5'
 - '3.6'
+- '3.7'
+- '3.8'
 install:
 - python setup.py install
 - pip install coverage
diff --git a/CHANGES.txt b/CHANGES.txt
index 0352750..0f9469c 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,4 @@
+v0.2.2, 2020-06-20 -- Add python 3.7 and 3.8 to travis (remove 3.3)
 v0.2.1, 2017-03-04 -- Add python 3.6 to travis (remove 2.6 and 3.3)
 v0.2.0, 2016-03-09 -- Remove ujson for json
 v0.1.13, 2016-02-09 -- Add py3.4 and py3.5 to tests. Deploy on pypi via travis.
diff --git a/random_words/test/test_random_words.py b/random_words/test/test_random_words.py
index 5b8dd60..a158d5a 100644
--- a/random_words/test/test_random_words.py
+++ b/random_words/test/test_random_words.py
@@ -109,6 +109,9 @@ def test_random_nicks_count(self):
         for letter in self.letters:
             pytest.raises(
                 ValueError, self.rn.random_nicks, letter, count=len_random)
+    
+    def test_random_nicks_letter_must_be_string(self):
+        pytest.raises(ValueError, self.rn.random_nicks, 0)
 
     def test_random_nicks_not_gender(self):
         pytest.raises(ValueError, self.rn.random_nicks, gender=[])
diff --git a/setup.py b/setup.py
index 1affdb7..200b70e 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@ def run_tests(self):
 
 setup(
     name='RandomWords',
-    version='0.2.1',
+    version='0.2.2',
     author='Tomek Święcicki',
     author_email='tomislater@gmail.com',
     packages=['random_words'],
@@ -35,10 +35,11 @@ def run_tests(self):
         'Natural Language :: English',
         'Development Status :: 5 - Production/Stable',
         'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3.3',
         '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',
         'Topic :: Software Development :: Libraries :: Python Modules',
     ],
     include_package_data=True,