diff --git a/pyproject.toml b/pyproject.toml
index c4c427d..929d2b7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ Docs = "https://noumenal.es/neapolitan/"
 
 [project.optional-dependencies]
 docs = ["Sphinx"]
-tests = ["coverage", "django_coverage_plugin"]
+tests = ["coverage[toml]", "django_coverage_plugin"]
 
 [tool.coverage.run]
 plugins = ["django_coverage_plugin"]