diff --git a/releasenotes/notes/drop-python2-534124afa50f62dd.yaml b/releasenotes/notes/drop-python2-534124afa50f62dd.yaml
new file mode 100644
index 0000000..88f491e
--- /dev/null
+++ b/releasenotes/notes/drop-python2-534124afa50f62dd.yaml
@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of
+    ironic-python-agent-builder to support Python 2.7 is OpenStack Train. The
+    minimum version of Python now supported by ironic-python-agent-builder is
+    Python 3.6.
diff --git a/test-requirements.txt b/test-requirements.txt
index 02564e2..7a4744a 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,7 +7,6 @@ hacking>=1.0.0,<1.2.0 # Apache-2.0
 flake8-import-order>=0.13 # LGPLv3
 # documentation
 doc8>=0.6.0 # Apache-2.0
-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,!=2.1.0,>=1.6.2;python_version>='3.4' # BSD
 openstackdocstheme>=1.20.0 # Apache-2.0
 # releasenotes
diff --git a/tox.ini b/tox.ini
index 85c96ac..465c8f6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,33 +6,29 @@ skipsdist = True
 [testenv]
 usedevelop = True
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
+basepython = python3
 setenv =
    VIRTUAL_ENV={envdir}
    PYTHONWARNINGS=default::DeprecationWarning
 deps = -r{toxinidir}/test-requirements.txt
 
 [testenv:pep8]
-basepython = python3
 commands =
     flake8 ironic_python_agent_builder
     doc8 doc/source README.rst CONTRIBUTING.rst
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:docs]
-basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:pdf-docs]
 whitelist_externals = make
-basepython = python3
 commands = sphinx-build -b latex doc/source doc/build/pdf
            make -C doc/build/pdf
 
 [testenv:releasenotes]
-basepython = python3
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html