diff --git a/pyproject.toml b/pyproject.toml
index d174d86..22812c5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,7 +57,7 @@ develop = [
   "black<25",
   "mypy<1.10",
   "poethepoet<0.26",
-  "pyproject-fmt<1.8",
+  "pyproject-fmt<1.9",
   "ruff<0.5",
   "validate-pyproject<0.17",
 ]