diff --git a/pyproject.toml b/pyproject.toml
index d8c5ca2..4d1dd3e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ dependencies = [
 dev = [
   "black>=23.7,<27.0",
   "flake8>=6.1,<8.0",
-  "isort>=5.12,<8.0",
+  "isort>=5.12,<9.0",
   "pre-commit>=3.3.3,<5.0.0",
   "pysen>=0.10.5,<0.13.0",
   "pytest>=7.4,<10.0",