diff --git a/CONTRIBUTING.asciidoc b/CONTRIBUTING.asciidoc
index ed76f5152..1975a9d7c 100644
--- a/CONTRIBUTING.asciidoc
+++ b/CONTRIBUTING.asciidoc
@@ -91,8 +91,7 @@ unittests and several linters/checkers.
 
 Currently, the following tools will be invoked when you run `tox`:
 
-* Unit tests using the Python
-https://docs.python.org/3.4/library/unittest.html[unittest] framework
+* Unit tests using https://www.pytest.org[pytest].
 * https://pypi.python.org/pypi/pyflakes[pyflakes] via https://pypi.python.org/pypi/pytest-flakes[pytest-flakes]
 * https://pypi.python.org/pypi/pep8[pep8] via https://pypi.python.org/pypi/pytest-pep8[pytest-pep8]
 * https://pypi.python.org/pypi/mccabe[mccabe] via https://pypi.python.org/pypi/pytest-mccabe[pytest-mccabe]