diff --git a/pyproject.toml b/pyproject.toml
index be3924bc..f21f22c2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
     "bec_ipython_client~=3.70", # needed for jupyter console
     "bec_lib~=3.70",
     "bec_qthemes~=0.7, >=0.7",
-    "black~=25.0",              # needed for bw-generate-cli
+    "black>=25,<27",              # needed for bw-generate-cli
     "isort~=5.13, >=5.13.2",    # needed for bw-generate-cli
     "pydantic~=2.0",
     "pyqtgraph==0.13.7",