diff --git a/.zuul.yaml b/.zuul.yaml
index 06dd412..5146989 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -2,8 +2,8 @@
     check:
       jobs:
         - tox-pep8
-        - tox-py27
+        - tox-py37
     gate:
       jobs:
         - tox-pep8
-        - tox-py27
+        - tox-py37
diff --git a/gerritbot/bot.py b/gerritbot/bot.py
index 73fdd9c..c711d5b 100755
--- a/gerritbot/bot.py
+++ b/gerritbot/bot.py
@@ -15,6 +15,31 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import configparser
+import daemon
+from ib3.auth import SASL
+from ib3.connection import SSL
+import irc.bot
+import json
+import logging.config
+import os
+import re
+import sys
+import threading
+import time
+import yaml
+
+import paho.mqtt.client as mqtt
+
+try:
+    import daemon.pidlockfile
+    pid_file_module = daemon.pidlockfile
+except Exception:
+    # as of python-daemon 1.6 it doesn't bundle pidlockfile anymore
+    # instead it depends on lockfile-0.9.1
+    import daemon.pidfile
+    pid_file_module = daemon.pidfile
+
 # The configuration file should look like:
 """
 [ircbot]
@@ -53,31 +78,6 @@ openstack-dev:
       - ^stable/(newton|ocata|pike)
 """
 
-import ConfigParser
-import daemon
-from ib3.auth import SASL
-from ib3.connection import SSL
-import irc.bot
-import json
-import logging.config
-import os
-import re
-import sys
-import threading
-import time
-import yaml
-
-import paho.mqtt.client as mqtt
-
-try:
-    import daemon.pidlockfile
-    pid_file_module = daemon.pidlockfile
-except Exception:
-    # as of python-daemon 1.6 it doesn't bundle pidlockfile anymore
-    # instead it depends on lockfile-0.9.1
-    import daemon.pidfile
-    pid_file_module = daemon.pidfile
-
 
 # https://bitbucket.org/jaraco/irc/issue/34/
 # irc-client-should-not-crash-on-failed
@@ -475,7 +475,7 @@ def main():
         print("Usage: %s CONFIGFILE" % sys.argv[0])
         sys.exit(1)
 
-    config = ConfigParser.ConfigParser()
+    config = configparser.ConfigParser()
     config.read(sys.argv[1])
 
     pid_path = ""
diff --git a/requirements.txt b/requirements.txt
index bde41b8..bbddadb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,3 @@
-pbr>=0.6,!=0.7
-
 gerritlib
 irc
 pyyaml
diff --git a/test-requirements.txt b/test-requirements.txt
index 8b0b4a6..22865b7 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,6 +1,5 @@
-hacking>=0.10.0,<0.11
-sphinx!=1.6.6,!=1.6.7,<2.0.0;python_version=='2.7'  # BSD
-sphinx!=1.6.6,!=1.6.7,!=2.1.0;python_version>='3.4'  # BSD
+flake8
+sphinx>=1.6.1
 os-testr>=0.8.0 # Apache-2.0
 mock>=2.0.0 # BSD
 testtools>=1.4.0 # MIT
diff --git a/tox.ini b/tox.ini
index 03b5f81..21f3c04 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,10 @@
 [tox]
-envlist = py27,pep8
+envlist = py37,pep8
 
 [testenv]
 usedevelop = True
 install_command = pip install {opts} {packages}
+basepython = python3
 setenv = VIRTUAL_ENV={envdir}
          PYTHONDONTWRITEBYTECODE = 1
          LANGUAGE=en_US