diff --git a/pyproject.toml b/pyproject.toml
index bb247dff7..55ac63123 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ maintainers = [
     { name = "FEniCS Steering Council" },
 ]
 description = "Unified Form Language"
-readme = "README.rst"
+readme = "README.md"
 license = { file = "COPYING.lesser" }
 requires-python = ">=3.8.0"
 dependencies = ["numpy"]