diff --git a/pyproject.toml b/pyproject.toml
index f3ba8752114..a3d30d3fbf5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,6 +62,7 @@ dependencies = [
     "pyarrow",  # extra dependency for pandas (parquet)
     "pydantic > 2, < 2.10",
     "PyQt5",
+    "PyQt5-sip < 12.16.0",
     "python-dateutil",
     "python-multipart",
     "pyyaml",