diff --git a/pyproject.toml b/pyproject.toml
index cc0c6c9..431f1d0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -58,7 +58,7 @@ starmatrix = "starmatrix.cli:main"
 
 ### Tool configuration ###
 
-[tool:pytest]
+[tool.pytest]
 python_files = "test_*.py"
 addopts = "-v --cov=starmatrix"
 testpaths = "src/starmatrix/tests"