diff --git a/tox.ini b/tox.ini
index a5300403..d0543d6a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -71,7 +71,7 @@ commands =
      sphinx-build -W -b html doc doc/_build/html {posargs}
 
 [testenv:coverage-report]
-deps = coverage>=4.2
+deps = coverage[toml]>=4.2
 skip_install = true
 commands =
     coverage combine