diff --git a/pyproject.toml b/pyproject.toml
index 09d8eae88..54d140283 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ train = ["datasets", "accelerate>=0.20.3"]
 onnx = ["optimum[onnxruntime]>=1.23.1"]
 onnx-gpu = ["optimum[onnxruntime-gpu]>=1.23.1"]
 openvino = ["optimum-intel[openvino]>=1.20.0"]
-ipex = ["optimum-intel[ipex]>=1.20.0"]
+ipex = ["optimum-intel[ipex]>=1.21.0"]
 dev = ["datasets", "accelerate>=0.20.3", "pre-commit", "pytest", "pytest-cov", "peft"]
 
 [build-system]
diff --git a/sentence_transformers/models/Transformer.py b/sentence_transformers/models/Transformer.py
index 7241cbb09..99ccaf9d3 100644
--- a/sentence_transformers/models/Transformer.py
+++ b/sentence_transformers/models/Transformer.py
@@ -190,7 +190,9 @@ def _load_model(
         elif backend == "ipex":
             self._load_ipex_model(model_name_or_path, config, cache_dir, **model_args)
         else:
-            raise ValueError(f"Unsupported backend '{backend}'. `backend` should be `torch`, `onnx`, `openvino`, or `ipex`.")
+            raise ValueError(
+                f"Unsupported backend '{backend}'. `backend` should be `torch`, `onnx`, `openvino`, or `ipex`."
+            )
 
     def _load_peft_model(self, model_name_or_path: str, config: PeftConfig, cache_dir: str, **model_args) -> None:
         from peft import PeftModel
diff --git a/tests/test_backends.py b/tests/test_backends.py
index 5983807bb..0e3bd13c4 100644
--- a/tests/test_backends.py
+++ b/tests/test_backends.py
@@ -26,11 +26,7 @@
 ## Testing exporting:
 @pytest.mark.parametrize(
     ["backend", "expected_auto_model_class"],
-    [
-        ("onnx", ORTModelForFeatureExtraction),
-        ("openvino", OVModelForFeatureExtraction),
-        ("ipex", IPEXModel)
-    ],
+    [("onnx", ORTModelForFeatureExtraction), ("openvino", OVModelForFeatureExtraction), ("ipex", IPEXModel)],
 )
 @pytest.mark.parametrize(
     "model_kwargs", [{}, {"file_name": "wrong_file_name"}]