diff --git a/pyproject.toml b/pyproject.toml
index 19b8415..55c9044 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ dev = [
     "ruff",
     "mypy>=1.0,<2.0",
     "black>=23.0,<25.0",
-    "isort>=5.12,<5.14",
+    "isort>=5.12,<6.1",
     "pytest",
     "pytest-sphinx",
     "pytest-cov",