diff --git a/.gitignore b/.gitignore
index 254660e..9d96354 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *.mpack
+.coverage
 .tox
 __pycache__
 build
diff --git a/tox.ini b/tox.ini
index cf615e3..7c09670 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,7 +23,7 @@ commands =
 
 [testenv:coverage]
 deps =
-    coverage >=5.5
+    coverage[toml] >=5.5
     numpy >=1.15.4
 commands =
     coverage erase