diff --git a/pyproject.toml b/pyproject.toml
index 01711eed5..97388f37d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -114,9 +114,9 @@ benchmark = [
 black22 = [ "black==22.1" ]
 black23 = [ "black==23.12" ]
 black24 = [ "black==24.1" ]
-isort5 = [ "isort>=5,<6" ]
-isort6 = [ "isort>=6,<7" ]
-isort7 = [ "isort>=7,<8; python_version>='3.10'" ]
+isort5 = [ "isort>=5,<9" ]
+isort6 = [ "isort>=6,<9" ]
+isort7 = [ "isort>=7,<9; python_version>='3.10'" ]
 isort8 = [ "isort>=8,<9; python_version>='3.10'" ]
 fix = [ "prek>=0.2.22" ]
 pkg-meta = [ "check-wheel-contents>=0.6.1", "twine>=6.1", "uv>=0.5.22" ]