diff --git a/.appveyor.yml b/.appveyor.yml
index 2ef722f83..56a123a5b 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -68,7 +68,7 @@ install:
   - ps: (new-object net.webclient).DownloadFile('http://nirbheek.in/files/binaries/ninja/win32/ninja.exe', 'C:\projects\meson\ninja.exe')
   # Use the x86 python only when building for x86 for the cpython tests.
   # For all other archs (including, say, arm), use the x64 python.
-  - cmd: if %arch%==x86 (set MESON_PYTHON_PATH=C:\python34) else (set MESON_PYTHON_PATH=C:\python34-x64)
+  - cmd: if %arch%==x86 (set MESON_PYTHON_PATH=C:\python35) else (set MESON_PYTHON_PATH=C:\python35-x64)
 
   # Set paths for BOOST dll files
   - cmd: if %compiler%==msvc2015 ( if %arch%==x86 ( set "PATH=%PATH%;C:\Libraries\boost_1_59_0\lib32-msvc-14.0" ) else ( set "PATH=%PATH%;C:\Libraries\boost_1_59_0\lib64-msvc-14.0" ) )
diff --git a/mesonbuild/coredata.py b/mesonbuild/coredata.py
index d4a91a7b0..0fdac8b8e 100644
--- a/mesonbuild/coredata.py
+++ b/mesonbuild/coredata.py
@@ -18,7 +18,7 @@ import pickle, os, uuid
 import sys
 from pathlib import PurePath
 from collections import OrderedDict
-from .mesonlib import MesonException, commonpath
+from .mesonlib import MesonException
 from .mesonlib import default_libdir, default_libexecdir, default_prefix
 import ast
 
@@ -274,7 +274,7 @@ class CoreData:
             # commonpath will always return a path in the native format, so we
             # must use pathlib.PurePath to do the same conversion before
             # comparing.
-            if commonpath([value, prefix]) != str(PurePath(prefix)):
+            if os.path.commonpath([value, prefix]) != str(PurePath(prefix)):
                 m = 'The value of the {!r} option is {!r} which must be a ' \
                     'subdir of the prefix {!r}.\nNote that if you pass a ' \
                     'relative path, it is assumed to be a subdir of prefix.'
diff --git a/mesonbuild/mesonlib.py b/mesonbuild/mesonlib.py
index 66bf98edf..3b3299637 100644
--- a/mesonbuild/mesonlib.py
+++ b/mesonbuild/mesonlib.py
@@ -702,31 +702,6 @@ def Popen_safe_legacy(args, write=None, stderr=subprocess.PIPE, **kwargs):
             e = e.decode(errors='replace').replace('\r\n', '\n')
     return p, o, e
 
-def commonpath(paths):
-    '''
-    For use on Python 3.4 where os.path.commonpath is not available.
-    We currently use it everywhere so this receives enough testing.
-    '''
-    # XXX: Replace me with os.path.commonpath when we start requiring Python 3.5
-    import pathlib
-    if not paths:
-        raise ValueError('arg is an empty sequence')
-    common = pathlib.PurePath(paths[0])
-    for path in paths[1:]:
-        new = []
-        path = pathlib.PurePath(path)
-        for c, p in zip(common.parts, path.parts):
-            if c != p:
-                break
-            new.append(c)
-        # Don't convert '' into '.'
-        if not new:
-            common = ''
-            break
-        new = os.path.join(*new)
-        common = pathlib.PurePath(new)
-    return str(common)
-
 def iter_regexin_iter(regexiter, initer):
     '''
     Takes each regular expression in @regexiter and tries to search for it in
diff --git a/mesonbuild/mesonmain.py b/mesonbuild/mesonmain.py
index 12bbd6914..e48122f92 100644
--- a/mesonbuild/mesonmain.py
+++ b/mesonbuild/mesonmain.py
@@ -279,8 +279,8 @@ def run_script_command(args):
     return cmdfunc(cmdargs)
 
 def run(original_args, mainfile=None):
-    if sys.version_info < (3, 4):
-        print('Meson works correctly only with python 3.4+.')
+    if sys.version_info < (3, 5):
+        print('Meson works correctly only with python 3.5+.')
         print('You have python %s.' % sys.version)
         print('Please update your environment')
         return 1
diff --git a/run_unittests.py b/run_unittests.py
index dae72a849..08ad63209 100755
--- a/run_unittests.py
+++ b/run_unittests.py
@@ -191,26 +191,6 @@ class InternalTests(unittest.TestCase):
         l.append_direct('-lbar')
         self.assertEqual(l, ['-Lfoodir', '-lfoo', '-Lbardir', '-lbar', '-lbar'])
 
-    def test_commonpath(self):
-        from os.path import sep
-        commonpath = mesonbuild.mesonlib.commonpath
-        self.assertRaises(ValueError, commonpath, [])
-        self.assertEqual(commonpath(['/usr', '/usr']), sep + 'usr')
-        self.assertEqual(commonpath(['/usr', '/usr/']), sep + 'usr')
-        self.assertEqual(commonpath(['/usr', '/usr/bin']), sep + 'usr')
-        self.assertEqual(commonpath(['/usr/', '/usr/bin']), sep + 'usr')
-        self.assertEqual(commonpath(['/usr/./', '/usr/bin']), sep + 'usr')
-        self.assertEqual(commonpath(['/usr/bin', '/usr/bin']), sep + 'usr' + sep + 'bin')
-        self.assertEqual(commonpath(['/usr//bin', '/usr/bin']), sep + 'usr' + sep + 'bin')
-        self.assertEqual(commonpath(['/usr/./bin', '/usr/bin']), sep + 'usr' + sep + 'bin')
-        self.assertEqual(commonpath(['/usr/local', '/usr/lib']), sep + 'usr')
-        self.assertEqual(commonpath(['/usr', '/bin']), sep)
-        self.assertEqual(commonpath(['/usr', 'bin']), '')
-        self.assertEqual(commonpath(['blam', 'bin']), '')
-        prefix = '/some/path/to/prefix'
-        libdir = '/some/path/to/prefix/libdir'
-        self.assertEqual(commonpath([prefix, libdir]), str(PurePath(prefix)))
-
     def test_string_templates_substitution(self):
         dictfunc = mesonbuild.mesonlib.get_filenames_templates_dict
         substfunc = mesonbuild.mesonlib.substitute_values