diff --git a/pyproject.toml b/pyproject.toml
index 227503f..394c264 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
 requires-python = "~=3.8"
 dependencies = [
   "pytest>=3.5.0",
-  "attrs<23,>=19",
+  "attrs>=19,<24",
   "importlib-metadata~=6.0;python_version<'3.10'",
   "importlib-resources~=5.0;python_version<'3.9'",
   "nbclient~=0.5.10",