diff --git a/pyproject.toml b/pyproject.toml
index b93094d4..68acbd0c 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~=1.0, >=1.3.3",
-    "black~=25.0",                   # needed for bw-generate-cli
+    "black>=26,<27",                   # needed for bw-generate-cli
     "isort~=5.13, >=5.13.2",         # needed for bw-generate-cli
     "ophyd_devices~=1.29, >=1.29.1",
     "pydantic~=2.0",