diff --git a/doc/requirements.txt b/doc/requirements.txt
index 6734c53..8512370 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,4 +1,3 @@
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
 sphinxcontrib-apidoc>=0.2.0  # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
diff --git a/releasenotes/notes/drop-py-2-7-0991cef98d96593e.yaml b/releasenotes/notes/drop-py-2-7-0991cef98d96593e.yaml
new file mode 100644
index 0000000..5291a92
--- /dev/null
+++ b/releasenotes/notes/drop-py-2-7-0991cef98d96593e.yaml
@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of python-congressclient
+    to support python 2.7 is OpenStack Train. The minimum version of Python now
+    supported is Python 3.6.
diff --git a/setup.cfg b/setup.cfg
index 4786e57..bd47c4e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -13,8 +13,6 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
diff --git a/tox.ini b/tox.ini
index a91f295..30cb393 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,11 @@
 [tox]
-minversion = 2.0
-envlist = py37,py36,py27,pep8
+minversion = 3.1.1
+envlist = py37,py36,pep8
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 whitelist_externals = find
@@ -16,24 +18,19 @@ commands =
  stestr run --slowest {posargs}
 
 [testenv:pep8]
-basepython = python3
 commands = flake8
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 commands = stestr run {posargs}
 
 [testenv:docs]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
-basepython = python3
 envdir = {toxworkdir}/docs
 deps = {[testenv:docs]deps}
 whitelist_externals =
@@ -43,7 +40,6 @@ commands =
   make -C doc/build/pdf
 
 [testenv:releasenotes]
-basepython = python3
 deps = {[testenv:docs]deps}
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
@@ -56,7 +52,6 @@ builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt