diff --git a/setup.cfg b/setup.cfg
index 77f8ce0..549f9d5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -12,9 +12,8 @@ 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 :: 2.6
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.7
 
 [entry_points]
 console_scripts =
diff --git a/test-requirements.txt b/test-requirements.txt
index 22865b7..b787edc 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,5 +1,5 @@
 flake8
 sphinx>=1.6.1
-os-testr>=0.8.0 # Apache-2.0
+stestr>=1.0.0 # Apache-2.0
 mock>=2.0.0 # BSD
 testtools>=1.4.0 # MIT
diff --git a/tox.ini b/tox.ini
index 21f3c04..818e9db 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,7 +15,7 @@ deps = -r{toxinidir}/test-requirements.txt
 whitelist_externals = rm
 commands =
     rm -f .testrepository/times.dbm
-    ostestr {posargs}
+    stestr run {posargs}
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY