diff --git a/pyproject.toml b/pyproject.toml
index 7f52303..4ced196 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -69,7 +69,7 @@ test = [
     "types-tree-sitter",
     "flake8 >=6.0.0,<8.0.0",
     "ruff >=0.5.1,<0.10.0",
-    "isort >=5.0.0,<6.0.0",
+    "isort >=5.0.0,<7.0.0",
     "nltk >=3.0.0,<4.0.0",
 ]