diff --git a/pyproject.toml b/pyproject.toml
index be3924bc..9aa93a93 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ dependencies = [
     "bec_lib~=3.70",
     "bec_qthemes~=0.7, >=0.7",
     "black~=25.0",              # needed for bw-generate-cli
-    "isort~=5.13, >=5.13.2",    # needed for bw-generate-cli
+    "isort>=5.13, <9.0",    # needed for bw-generate-cli
     "pydantic~=2.0",
     "pyqtgraph==0.13.7",
     "PySide6==6.9.0",