diff --git a/pyproject.toml b/pyproject.toml
index 80457ec..b4a6f3e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ dev = [
     "pytest-codspeed>=3.0,<5.0",
     "ipdb>=0.13.9,<0.14.0",
     "black>=24.0,<28.0",
-    "isort>=5.0,<6.0",
+    "isort>=5.0,<9.0",
     "flake8>=6.0,<8.0",
     "bandit>=1.7,<2.0",
     "coverage>=7.0,<9.0",