diff --git a/pyproject.toml b/pyproject.toml
index a124f8a..c6806e8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -72,6 +72,7 @@ format_check = "ruff format --check {args}"
 [tool.coverage.run]
 branch = true
 parallel = true
+concurrency = ["multiprocessing"]
 omit = []
 
 [tool.coverage.report]