diff --git a/tox.ini b/tox.ini
index e3e44ed3..941dd41b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,8 +17,8 @@ extras=
     pydantic
     flask
     aiohttp
-commands=
-    python -m unittest discover -s tests/unit -p test_*_py3*.py
+commands = pytest
+python_files = test_*_py3*.py
 
 [testenv:coveralls]
 passenv = GITHUB_* COVERALLS_*
@@ -31,7 +31,7 @@ deps=
     coveralls
 commands=
     coverage erase
-    coverage run --rcfile=./.coveragerc -m unittest discover -s tests/unit/ -p test_*_py3*.py
+    coverage run --rcfile=./.coveragerc -m pytest
     coverage report --rcfile=./.coveragerc
     coveralls
 
@@ -40,8 +40,8 @@ deps=
 extras=
     yaml
     flask
-commands=
-    python -m unittest discover -s tests/unit -p test_*_py2_py3.py
+commands = pytest
+python_files = test_*_py2_py3.py
 
 [testenv:3.5]
 deps=
@@ -49,16 +49,14 @@ deps=
 extras=
     yaml
     flask
-commands=
-    python -m unittest discover -s tests/unit -p test_*_py3.py
+python_files = test_*_py3.py
 
 [testenv:pypy2]
 deps=
 extras=
     yaml
     flask
-commands=
-    python -m unittest discover -s tests/unit -p test_*_py2_py3.py
+python_files = test_*_py2_py3.py
 
 [testenv:pypy3]
 deps=
@@ -69,8 +67,7 @@ deps=
 extras=
     yaml
     flask
-commands=
-    python -m unittest discover -s tests/unit -p test_*_py2_py3.py
+python_files = test_*_py2_py3.py
 
 
 [testenv:pylint]