diff --git a/.travis.yml b/.travis.yml
index 346853a6..e415d4cc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,9 @@
 language: python
 python:
-  - 2.7
   - 3.5
   - 3.6
   - 3.7
   - 3.8
-  - pypy
   - pypy3
 jobs:
   include:
diff --git a/appveyor.yml b/appveyor.yml
index de78ed90..03e48524 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -4,7 +4,6 @@ environment:
   matrix:
     # https://www.appveyor.com/docs/installed-software#python lists available
     # versions
-    - PYTHON: "C:\\Python27"
     - PYTHON: "C:\\Python35"
     - PYTHON: "C:\\Python36"
     - PYTHON: "C:\\Python37"
diff --git a/setup.py b/setup.py
index d2c8277e..f12625e5 100755
--- a/setup.py
+++ b/setup.py
@@ -46,9 +46,8 @@ def read(filename):
 ])
 
 tests_require = ['freezegun']
-if sys.version_info < (3,):
-    # Python 2 doesn't have unittest.mock
-    tests_require.append('mock')
+if sys.version_info < (3, 5, 0):
+    sys.exit("Python 3.5 is the minimum required version")
 
 setup(
     name='gtimelog',
@@ -64,7 +63,6 @@ def read(filename):
         'Development Status :: 4 - Beta',
         'Environment :: X11 Applications :: GTK',
         'License :: OSI Approved :: GNU General Public License (GPL)',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
@@ -73,6 +71,7 @@ def read(filename):
         'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Office/Business',
     ],
+    python_requires='>= 3.5',
 
     packages=find_packages('src'),
     package_dir={'': 'src'},
@@ -84,9 +83,6 @@ def read(filename):
         'test': [
             'freezegun',
         ],
-        'test:python_version == "2.7"': [
-            'mock',
-        ],
     },
     zip_safe=False,
     entry_points="""
diff --git a/src/gtimelog/main.py b/src/gtimelog/main.py
index 029b731a..59258325 100644
--- a/src/gtimelog/main.py
+++ b/src/gtimelog/main.py
@@ -1,6 +1,4 @@
 """An application for keeping track of your time."""
-from __future__ import print_function, absolute_import
-
 import time
 import sys
 
@@ -90,20 +88,6 @@ def require_version(namespace, version):
     Reports, ReportRecord, TaskList, TimeLog)
 
 
-if str is bytes:
-    # Python 2: GTK+ gives us back UTF-8 strings
-    def to_unicode(s):
-        return s.decode('UTF-8')
-    def to_bytes(s):
-        return s
-else:
-    # Python 3: GTK+ gives us Unicode strings
-    def to_unicode(s):
-        return s
-    def to_bytes(s):
-        return s.encode('UTF-8')
-
-
 mark_time("gtimelog imports done")
 
 
@@ -1951,7 +1935,7 @@ def update_subject(self, *args):
             return # not loaded yet
         window = self.get_time_window()
         reports = Reports(window)
-        name = to_unicode(self.name)
+        name = self.name
         if self.time_range == 'day':
             self._subject = reports.daily_report_subject(name)
         elif self.time_range == 'week':
@@ -1969,8 +1953,8 @@ def populate_report(self):
         window = self.get_time_window()
         reports = Reports(window, email_headers=False, style=self.report_style)
         output = StringIO()
-        recipient = to_unicode(self.recipient)
-        name = to_unicode(self.name)
+        recipient = self.recipient
+        name = self.name
         if self.time_range == 'day':
             reports.daily_report(output, recipient, name)
         elif self.time_range == 'week':
diff --git a/src/gtimelog/settings.py b/src/gtimelog/settings.py
index 4ff5b7e8..f6c3b209 100644
--- a/src/gtimelog/settings.py
+++ b/src/gtimelog/settings.py
@@ -8,12 +8,7 @@
 import locale
 import os
 
-try:
-    from configparser import RawConfigParser
-    PY3 = True
-except ImportError:
-    from ConfigParser import RawConfigParser
-    PY3 = False
+from configparser import RawConfigParser
 
 
 from gtimelog.timelog import parse_time
@@ -101,8 +96,8 @@ def _config(self):
         config = RawConfigParser()
         config.add_section('gtimelog')
         config.set('gtimelog', 'list-email', self.email)
-        config.set('gtimelog', 'name', self.from_unicode(self.name))
-        config.set('gtimelog', 'sender', self.from_unicode(self.sender))
+        config.set('gtimelog', 'name', self.name)
+        config.set('gtimelog', 'sender', self.sender)
         config.set('gtimelog', 'editor', self.editor)
         config.set('gtimelog', 'mailer', self.mailer)
         config.set('gtimelog', 'spreadsheet', self.spreadsheet)
@@ -126,25 +121,14 @@ def _config(self):
         config.set('gtimelog', 'start_in_tray', str(self.start_in_tray))
         return config
 
-    if PY3:  # pragma: PY3
-        def to_unicode(self, value):
-            return value  # ConfigParser already gives us unicode
-        def from_unicode(self, value):
-            return value  # ConfigParser already accepts unicode
-    else:  # pragma: PY2
-        def to_unicode(self, value):
-            return value.decode(self._encoding)
-        def from_unicode(self, value):
-            return value.encode(self._encoding)
-
     def load(self, filename=None):
         if filename is None:
             filename = self.get_config_file()
         config = self._config()
         config.read([filename])
         self.email = config.get('gtimelog', 'list-email')
-        self.name = self.to_unicode(config.get('gtimelog', 'name'))
-        self.sender = self.to_unicode(config.get('gtimelog', 'sender'))
+        self.name = config.get('gtimelog', 'name')
+        self.sender = config.get('gtimelog', 'sender')
         self.editor = config.get('gtimelog', 'editor')
         self.mailer = config.get('gtimelog', 'mailer')
         self.spreadsheet = config.get('gtimelog', 'spreadsheet')
diff --git a/src/gtimelog/tests/test_main.py b/src/gtimelog/tests/test_main.py
index 2906172e..860b93fa 100644
--- a/src/gtimelog/tests/test_main.py
+++ b/src/gtimelog/tests/test_main.py
@@ -4,12 +4,7 @@
 import textwrap
 import unittest
 
-try:
-    # Python 3
-    from unittest import mock
-except ImportError:
-    # Python 2
-    import mock
+from unittest import mock
 
 
 gi = mock.MagicMock()
diff --git a/src/gtimelog/tests/test_timelog.py b/src/gtimelog/tests/test_timelog.py
index 3153700f..d6fadcf2 100644
--- a/src/gtimelog/tests/test_timelog.py
+++ b/src/gtimelog/tests/test_timelog.py
@@ -10,19 +10,11 @@
 import textwrap
 import time
 import unittest
-import sys
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from io import StringIO
+import sys  # noqa: F401
+from io import StringIO
 
 import freezegun
-try:
-    # Python 3
-    from unittest import mock
-except ImportError:
-    # Python 2
-    import mock
+from unittest import mock
 
 from gtimelog.timelog import (
     TimeLog, Reports, ReportRecord, Exports, TaskList, TimeCollection,
diff --git a/src/gtimelog/timelog.py b/src/gtimelog/timelog.py
index ab2bb728..7339c8b5 100644
--- a/src/gtimelog/timelog.py
+++ b/src/gtimelog/timelog.py
@@ -17,9 +17,6 @@
 from operator import itemgetter
 
 
-PY3 = sys.version_info[0] >= 3
-
-
 def as_minutes(duration):
     """Convert a datetime.timedelta to an integer number of minutes."""
     return duration.days * 24 * 60 + duration.seconds // 60
@@ -423,7 +420,7 @@ def to_csv_complete(self, output, title_row=True):
 
         The file has two columns: task title and time (in minutes).
         """
-        writer = CSVWriter(output)
+        writer = csv.writer(output)
         if title_row:
             writer.writerow(["task", "time (minutes)"])
         work, slack = self.window.grouped_entries()
@@ -439,7 +436,7 @@ def to_csv_daily(self, output, title_row=True):
         The file has four columns: date, time from midnight til arrival at
         work, slacking, and work (in decimal hours).
         """
-        writer = CSVWriter(output)
+        writer = csv.writer(output)
         if title_row:
             writer.writerow(["date", "day-start (hours)",
                              "slacking (hours)", "work (hours)"])
@@ -1127,23 +1124,3 @@ def load(self):
     def reload(self):
         """Reload the task list."""
         self.load()
-
-
-class CSVWriter(object):
-
-    def __init__(self, *args, **kw):
-        self._writer = csv.writer(*args, **kw)
-
-    if PY3:  # pragma: PY3
-        def writerow(self, row):
-            self._writer.writerow(row)
-    else:  # pragma: PY2
-        def writerow(self, row):
-            self._writer.writerow([
-                s.encode('UTF-8') if isinstance(s, unicode) else s  # noqa: F821
-                for s in row
-            ])
-
-    def writerows(self, rows):
-        for row in rows:
-            self.writerow(row)
diff --git a/tox.ini b/tox.ini
index 953138c9..7972e6e3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,14 +1,12 @@
 [tox]
 envlist =
-    py27,py35,py36,py37,py38,pypy,pypy3,flake8
+    py35,py36,py37,py38,pypy3,flake8
 
 [testenv]
 setenv =
     LC_ALL=C
 deps =
     freezegun
-    py27: mock
-    pypy: mock
 skip_install = true
 commands =
     pip install --no-deps -e .