diff --git a/.travis.yml b/.travis.yml
index 926f20ca..a2107847 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,14 @@
 language: python
 dist: trusty
-python:
-- pypy-5.4.1
-- 2.7
-- 3.4
-- 3.5
-- 3.6
+matrix:
+  include:
+    - python: pypy-5.4.1
+    - python: 3.7
+      dist: xenial
+      sudo: required
+    - python: 2.7
+    - python: 3.5
+    - python: 3.6
 install:
 - pip install -rrequirements-dev.txt coveralls
 script:
diff --git a/README.rst b/README.rst
index 6e8a73a0..0025f16b 100644
--- a/README.rst
+++ b/README.rst
@@ -24,7 +24,7 @@ distribution/deployment.  That means you can add just ``libsass`` into
 your ``setup.py``'s ``install_requires`` list or ``requirements.txt`` file.
 Need no Ruby nor Node.js.
 
-It currently supports CPython 2.7, 3.4--3.6, and PyPy 2.3+!
+It currently supports CPython 2.7, 3.5--3.7, and PyPy 2.3+!
 
 .. _Sass: https://sass-lang.com/
 .. _LibSass: https://github.com/sass/libsass
diff --git a/appveyor.yml b/appveyor.yml
index 150a8422..aced48c0 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -2,12 +2,12 @@ environment:
   matrix:
   - PYTHON: 'C:\Python27'
   - PYTHON: 'C:\Python27-x64'
-  - PYTHON: 'C:\Python34'
-  - PYTHON: 'C:\Python34-x64'
   - PYTHON: 'C:\Python35'
   - PYTHON: 'C:\Python35-x64'
   - PYTHON: 'C:\Python36'
   - PYTHON: 'C:\Python36-x64'
+  - PYTHON: 'C:\Python37'
+  - PYTHON: 'C:\Python37-x64'
 matrix:
   fast_finish: true
 init:
diff --git a/build_manylinux_wheels.py b/build_manylinux_wheels.py
index 3c5b56ff..bc7c9c6f 100755
--- a/build_manylinux_wheels.py
+++ b/build_manylinux_wheels.py
@@ -25,9 +25,9 @@ def main():
     os.makedirs('dist', exist_ok=True)
     for python in (
             'cp27-cp27mu',
-            'cp34-cp34m',
             'cp35-cp35m',
             'cp36-cp36m',
+            'cp37-cp37m',
     ):
         with tempfile.TemporaryDirectory() as work:
             pip = '/opt/python/{}/bin/pip'.format(python)
diff --git a/docs/index.rst b/docs/index.rst
index b5594a05..c6dd75cc 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -8,7 +8,7 @@ distribution/deployment.  That means you can add just ``libsass`` into
 your :file:`setup.py`'s ``install_requires`` list or :file:`requirements.txt`
 file.
 
-It currently supports CPython 2.6, 2.7, 3.4--3.6, and PyPy 2.3+!
+It currently supports CPython 2.6, 2.7, 3.5--3.7, and PyPy 2.3+!
 
 .. _Sass: https://sass-lang.com/
 .. _LibSass: https://github.com/sass/libsass
diff --git a/setup.py b/setup.py
index 463e79bc..10b52ca5 100644
--- a/setup.py
+++ b/setup.py
@@ -273,7 +273,7 @@ def run(self):
         ]
     },
     install_requires=['six'],
-    extras_require={'upload_appveyor_builds': ['twine == 1.5.0']},
+    extras_require={'upload_appveyor_builds': ['twine == 1.11.0']},
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Web Environment',
@@ -284,9 +284,9 @@ def run(self):
         'Programming Language :: C++',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Programming Language :: Python :: Implementation :: Stackless',
diff --git a/tox.ini b/tox.ini
index e9bd936d..43ebbf00 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = pypy, pypy3, py27, py34, py35, py36
+envlist = pypy, pypy3, py27, py35, py36, py37
 
 [testenv]
 deps = -rrequirements-dev.txt
diff --git a/upload_appveyor_builds.py b/upload_appveyor_builds.py
index 46e57ee8..0832850e 100755
--- a/upload_appveyor_builds.py
+++ b/upload_appveyor_builds.py
@@ -1,17 +1,15 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # TODO: Upload to GitHub releases
 # TODO: .pypirc configuration
-from __future__ import print_function
-
 import argparse
 import json
 import os
 import os.path
 import shutil
 import subprocess
+from urllib.parse import urljoin
+from urllib.request import urlopen
 
-from six.moves.urllib.parse import urljoin
-from six.moves.urllib.request import urlopen
 from twine.commands import upload
 
 
@@ -27,7 +25,7 @@
 
 def ci_builds():
     response = urlopen(APPVEYOR_API_BUILDS_URL)
-    projects = json.loads(response.read().decode('utf-8'))  # py3 compat
+    projects = json.load(response)
     response.close()
     return projects['builds']
 
@@ -62,7 +60,7 @@ def read(tag):
 def ci_jobs(build):
     url = urljoin(APPVEYOR_API_JOBS_URL, build['version'])
     response = urlopen(url)
-    build = json.loads(response.read().decode('utf-8'))  # py3 compat
+    build = json.load(response)
     response.close()
     return build['build']['jobs']
 
@@ -71,7 +69,7 @@ def ci_artifacts(job):
     url = urljoin(urljoin(APPVEYOR_API_JOB_URL, job['jobId'] + '/'),
                   'artifacts/')
     response = urlopen(url)
-    files = json.loads(response.read().decode('utf-8'))  # py3 compat
+    files = json.load(response)
     response.close()
     for file_ in files:
         file_['url'] = urljoin(url, file_['fileName'])
@@ -79,7 +77,7 @@ def ci_artifacts(job):
 
 
 def download_artifact(artifact, target_dir, overwrite=False):
-    print('Downloading {0}...'.format(artifact['fileName']))
+    print('Downloading {}...'.format(artifact['fileName']))
     response = urlopen(artifact['url'])
     filename = os.path.basename(artifact['fileName'])
     target_path = os.path.join(target_dir, filename)
@@ -123,7 +121,7 @@ def main():
         for artifact in artifacts:
             dist = download_artifact(artifact, args.dist_dir, args.overwrite)
             dists.append(dist)
-    print('Uploading {0} file(s)...'.format(len(dists)))
+    print('Uploading {} file(s)...'.format(len(dists)))
     upload.main(('-r', 'pypi') + tuple(dists))