diff --git a/pyproject.toml b/pyproject.toml
index 73c7162..090016d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -88,7 +88,7 @@ develop = [
   "black[jupyter]<25",
   "mypy<2",
   "poethepoet<1",
-  "pyproject-fmt>=1.3,<1.8",
+  "pyproject-fmt>=1.3,<1.9",
   "ruff<0.4",
   "validate-pyproject<0.17",
 ]