diff --git a/support/testing/infra/__init__.py b/support/testing/infra/__init__.py
index 43045d0173..6392aa679b 100644
--- a/support/testing/infra/__init__.py
+++ b/support/testing/infra/__init__.py
@@ -3,7 +3,8 @@ import re
 import sys
 import tempfile
 import subprocess
-from urllib2 import urlopen, HTTPError, URLError
+from urllib.request import urlopen
+from urllib.error import HTTPError, URLError
 
 ARTIFACTS_URL = "http://autobuild.buildroot.net/artefacts/"
 BASE_DIR = os.path.realpath(os.path.join(os.path.dirname(__file__), "../../.."))
@@ -44,7 +45,7 @@ def download(dldir, filename):
 
     try:
         url_fh = urlopen(os.path.join(ARTIFACTS_URL, filename))
-        with open(tmpfile, "w+") as tmpfile_fh:
+        with open(tmpfile, "w+b") as tmpfile_fh:
             tmpfile_fh.write(url_fh.read())
     except (HTTPError, URLError) as err:
         os.unlink(tmpfile)
@@ -60,7 +61,8 @@ def run_cmd_on_host(builddir, cmd):
     out = subprocess.check_output(cmd,
                                   stderr=open(os.devnull, "w"),
                                   cwd=builddir,
-                                  env={"LANG": "C"})
+                                  env={"LANG": "C"},
+                                  universal_newlines=True)
     return out
 
 
diff --git a/support/testing/infra/emulator.py b/support/testing/infra/emulator.py
index 093a643a8b..5611ec96e8 100644
--- a/support/testing/infra/emulator.py
+++ b/support/testing/infra/emulator.py
@@ -76,6 +76,7 @@ class Emulator(object):
         self.logfile.write("> starting qemu with '%s'\n" % " ".join(qemu_cmd))
         self.qemu = pexpect.spawn(qemu_cmd[0], qemu_cmd[1:],
                                   timeout=5 * self.timeout_multiplier,
+                                  encoding='utf-8',
                                   env={"QEMU_AUDIO_DRV": "none"})
         # We want only stdout into the log to avoid double echo
         self.qemu.logfile_read = self.logfile
diff --git a/support/testing/run-tests b/support/testing/run-tests
index 813b927045..74741aee1b 100755
--- a/support/testing/run-tests
+++ b/support/testing/run-tests
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 import argparse
 import sys
 import os
diff --git a/support/testing/tests/core/test_post_scripts.py b/support/testing/tests/core/test_post_scripts.py
index 40a36b7904..bc61f4af58 100644
--- a/support/testing/tests/core/test_post_scripts.py
+++ b/support/testing/tests/core/test_post_scripts.py
@@ -20,7 +20,7 @@ class TestPostScripts(infra.basetest.BRTest):
 
     def check_post_log_file(self, f, what, target_dir):
         lines = {}
-        with open(os.path.join(self.builddir, "build", f), 'rb') as csvfile:
+        with open(os.path.join(self.builddir, "build", f), newline='') as csvfile:
             r = csv.reader(csvfile, delimiter=',')
             for row in r:
                 lines[row[0]] = row[1]
diff --git a/support/testing/tests/download/gitremote.py b/support/testing/tests/download/gitremote.py
index 3b35456dd1..7df252d031 100644
--- a/support/testing/tests/download/gitremote.py
+++ b/support/testing/tests/download/gitremote.py
@@ -32,7 +32,8 @@ class GitRemote(object):
         for port in range(GIT_REMOTE_PORT_INITIAL, GIT_REMOTE_PORT_LAST + 1):
             cmd = daemon_cmd + ["--port={port}".format(port=port)]
             self.logfile.write("> starting git remote with '{}'\n".format(" ".join(cmd)))
-            self.daemon = pexpect.spawn(cmd[0], cmd[1:], logfile=self.logfile)
+            self.daemon = pexpect.spawn(cmd[0], cmd[1:], logfile=self.logfile,
+                                        encoding='utf-8')
             ret = self.daemon.expect(["Ready to rumble",
                                       "Address already in use"])
             if ret == 0:
diff --git a/support/testing/tests/download/test_git.py b/support/testing/tests/download/test_git.py
index 2455557298..ec5b8f3fdd 100644
--- a/support/testing/tests/download/test_git.py
+++ b/support/testing/tests/download/test_git.py
@@ -1,7 +1,7 @@
 import os
 import shutil
 
-from gitremote import GitRemote
+from tests.download.gitremote import GitRemote
 
 import infra
 
diff --git a/support/testing/tests/utils/test_check_package.py b/support/testing/tests/utils/test_check_package.py
index 17c2fcf3bc..c70ba02324 100644
--- a/support/testing/tests/utils/test_check_package.py
+++ b/support/testing/tests/utils/test_check_package.py
@@ -16,7 +16,8 @@ import infra
 def call_script(args, env, cwd):
     """Call a script and return stdout and stderr as lists."""
     out, err = subprocess.Popen(args, cwd=cwd, stdout=subprocess.PIPE,
-                                stderr=subprocess.PIPE, env=env).communicate()
+                                stderr=subprocess.PIPE, env=env,
+                                universal_newlines=True).communicate()
     return out.splitlines(), err.splitlines()