diff --git a/.drone.yml b/.drone.yml
index e0bc2f7026..5da6083eb7 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -25,12 +25,6 @@ services:
 
 matrix:
     include:
-        - IMAGE: python:2.7
-          TOXENV: py27
-          DATABASE: sqlite
-        - IMAGE: python:2.7
-          TOXENV: py27
-          DATABASE: postgresql
         - IMAGE: python:3.4
           TOXENV: py34
           DATABASE: sqlite
diff --git a/CHANGELOG b/CHANGELOG
index 2d23c44f47..480284ee3f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+* Remove support for Python 2.7
+
 Version 4.8.0 - 2018-04-23
 * Bug fixes (see mercurial logs for details)
 
diff --git a/INSTALL b/INSTALL
index 17c9cfaac2..8c8226dab8 100644
--- a/INSTALL
+++ b/INSTALL
@@ -4,7 +4,7 @@ Installing trytond_project_plan
 Prerequisites
 -------------
 
- * Python 2.7 or later (http://www.python.org/)
+ * Python 3.4 or later (http://www.python.org/)
  * trytond (http://www.tryton.org/)
  * trytond_company (http://www.tryton.org/)
  * trytond_timesheet (http://www.tryton.org/)
diff --git a/setup.py b/setup.py
index 7a04360171..091acba499 100644
--- a/setup.py
+++ b/setup.py
@@ -1,15 +1,12 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 
-from setuptools import setup
-import re
-import os
 import io
-try:
-    from configparser import ConfigParser
-except ImportError:
-    from ConfigParser import ConfigParser
+import os
+import re
+from configparser import ConfigParser
+from setuptools import setup
 
 
 def read(fname):
@@ -27,6 +24,7 @@ def get_require_version(name):
         major_version, minor_version + 1)
     return require
 
+
 config = ConfigParser()
 config.readfp(open('tryton.cfg'))
 info = dict(config.items('tryton'))
@@ -101,7 +99,6 @@ setup(name=name,
         'Natural Language :: Slovenian',
         'Natural Language :: Spanish',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
@@ -110,6 +107,7 @@ setup(name=name,
         'Topic :: Office/Business',
         ],
     license='GPL-3',
+    python_requires='>=3.4',
     install_requires=requires,
     dependency_links=dependency_links,
     zip_safe=False,
@@ -119,5 +117,4 @@ setup(name=name,
     """,
     test_suite='tests',
     test_loader='trytond.test_loader:Loader',
-    use_2to3=True,
     )
diff --git a/tox.ini b/tox.ini
index 2082ab4f4d..adbcbf8431 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,11 +1,11 @@
 [tox]
-envlist = {py27,py34,py35,py36}-{sqlite,postgresql},pypy-{sqlite,postgresql}
+envlist = {py34,py35,py36}-{sqlite,postgresql},pypy3-{sqlite,postgresql}
 
 [testenv]
 commands = {envpython} setup.py test
 deps =
-    {py27,py34,py35,py36}-postgresql: psycopg2 >= 2.5
-    pypy-postgresql: psycopg2cffi >= 2.5
+    {py34,py35,py36}-postgresql: psycopg2 >= 2.5
+    pypy3-postgresql: psycopg2cffi >= 2.5
     sqlite: sqlitebck
 setenv =
     sqlite: TRYTOND_DATABASE_URI={env:SQLITE_URI:sqlite://}
diff --git a/work.py b/work.py
index 6b18a36b1e..8e2c51cef2 100644
--- a/work.py
+++ b/work.py
@@ -2,6 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 import datetime
 from collections import deque, defaultdict
+from functools import reduce
 from heapq import heappop, heappush
 
 from trytond.model import ModelSQL, fields, tree
@@ -17,8 +18,7 @@ def intfloor(x):
     return int(round(x, 4))
 
 
-class Work(tree(parent='successors')):
-    __metaclass__ = PoolMeta
+class Work(tree(parent='successors'), metaclass=PoolMeta):
     __name__ = 'project.work'
     predecessors = fields.Many2Many('project.predecessor_successor',
         'successor', 'predecessor', 'Predecessors',
@@ -430,7 +430,7 @@ class Work(tree(parent='successors')):
         write_fields = ('early_start_time', 'early_finish_time',
                         'late_start_time', 'late_finish_time')
         to_write = []
-        for work, val in values.iteritems():
+        for work, val in values.items():
             write_cond = False
             for field in write_fields:
                 if field in val and getattr(work, field) != val[field]:
@@ -592,7 +592,7 @@ class PredecessorSuccessor(ModelSQL):
         super(PredecessorSuccessor, cls).write(*args)
 
         work_ids = [v for values in args[1::2]
-            for k, v in values.itervalues()
+            for k, v in values.values()
             if k in ('predecessor', 'successor')]
         works = Work.browse(work_ids)
         for work in works: