diff --git a/setup.cfg b/setup.cfg
index fdd2fe327..62d50f719 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -61,6 +61,7 @@ markers =
 
 [coverage:run]
 branch = True
+parallel = True
 source = sphinx
 
 [coverage:report]
diff --git a/tox.ini b/tox.ini
index 217cd1feb..b98c2e584 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,6 @@ description =
     py{35,36,37,38,39}: Run unit tests against {envname}.
     du{12,13,14}: Run unit tests with the given version of docutils.
 deps =
-    coverage < 5.0  # refs: https://github.com/sphinx-doc/sphinx/pull/6924
     git+https://github.com/html5lib/html5lib-python ; python_version >= "3.9"  # refs: https://github.com/html5lib/html5lib-python/issues/419
     du12: docutils==0.12
     du13: docutils==0.13.1