diff --git a/studio/backend/core/training/worker.py b/studio/backend/core/training/worker.py
index b412a05cc9..54667dd7af 100644
--- a/studio/backend/core/training/worker.py
+++ b/studio/backend/core/training/worker.py
@@ -405,10 +405,7 @@ def run_training_process(
     # (Qwen3.5, Gemma 4, etc.) are native and do NOT need it — enabling it
     # bypasses the compiler (disabling fused CE).
     _lowered = model_name.lower()
-    if (
-        "nemotron" in _lowered
-        and not config.get("trust_remote_code", False)
-    ):
+    if "nemotron" in _lowered and not config.get("trust_remote_code", False):
         config["trust_remote_code"] = True
         logger.info(
             "Auto-enabled trust_remote_code for Nemotron model: %s",
diff --git a/studio/backend/tests/test_transformers_version.py b/studio/backend/tests/test_transformers_version.py
index 387c1c6f13..c031c2fea3 100644
--- a/studio/backend/tests/test_transformers_version.py
+++ b/studio/backend/tests/test_transformers_version.py
@@ -206,7 +206,10 @@ class TestCheckConfigNeeds550:
 
     def test_gemma4_architecture(self, tmp_path: Path):
         """config.json with Gemma4ForConditionalGeneration should return True."""
-        cfg = {"architectures": ["Gemma4ForConditionalGeneration"], "model_type": "gemma4"}
+        cfg = {
+            "architectures": ["Gemma4ForConditionalGeneration"],
+            "model_type": "gemma4",
+        }
         (tmp_path / "config.json").write_text(json.dumps(cfg))
 
         assert _check_config_needs_550(str(tmp_path)) is True
@@ -272,7 +275,10 @@ class TestGetTransformersTier:
 
     def test_gemma4_config_json_returns_550(self, tmp_path: Path):
         """Local checkpoint with Gemma4 architecture → 550."""
-        cfg = {"architectures": ["Gemma4ForConditionalGeneration"], "model_type": "gemma4"}
+        cfg = {
+            "architectures": ["Gemma4ForConditionalGeneration"],
+            "model_type": "gemma4",
+        }
         (tmp_path / "config.json").write_text(json.dumps(cfg))
 
         assert get_transformers_tier(str(tmp_path)) == "550"
@@ -289,15 +295,20 @@ class TestGetTransformersTier:
             "utils.transformers_version._check_config_needs_550",
             return_value = False,
         ):
-            assert get_transformers_tier("mistralai/Ministral-3-8B-Instruct-2512") == "530"
+            assert (
+                get_transformers_tier("mistralai/Ministral-3-8B-Instruct-2512") == "530"
+            )
 
     def test_llama_returns_default(self):
-        with patch(
-            "utils.transformers_version._check_config_needs_550",
-            return_value = False,
-        ), patch(
-            "utils.transformers_version._check_tokenizer_config_needs_v5",
-            return_value = False,
+        with (
+            patch(
+                "utils.transformers_version._check_config_needs_550",
+                return_value = False,
+            ),
+            patch(
+                "utils.transformers_version._check_tokenizer_config_needs_v5",
+                return_value = False,
+            ),
         ):
             assert get_transformers_tier("meta-llama/Llama-3-8B") == "default"
 
@@ -314,11 +325,14 @@ class TestGetTransformersTier:
             return_value = False,
         ):
             assert needs_transformers_5("Qwen/Qwen3.5-9B") is True
-        with patch(
-            "utils.transformers_version._check_config_needs_550",
-            return_value = False,
-        ), patch(
-            "utils.transformers_version._check_tokenizer_config_needs_v5",
-            return_value = False,
+        with (
+            patch(
+                "utils.transformers_version._check_config_needs_550",
+                return_value = False,
+            ),
+            patch(
+                "utils.transformers_version._check_tokenizer_config_needs_v5",
+                return_value = False,
+            ),
         ):
             assert needs_transformers_5("meta-llama/Llama-3-8B") is False
diff --git a/studio/backend/utils/transformers_version.py b/studio/backend/utils/transformers_version.py
index a9a026895b..7ba20a366b 100644
--- a/studio/backend/utils/transformers_version.py
+++ b/studio/backend/utils/transformers_version.py
@@ -279,9 +279,7 @@ def _check_config_needs_550(model_name: str) -> bool:
         _config_needs_550_cache[model_name] = result
         return result
     except Exception as exc:
-        logger.debug(
-            "Could not fetch config.json for '%s': %s", model_name, exc
-        )
+        logger.debug("Could not fetch config.json for '%s': %s", model_name, exc)
         _config_needs_550_cache[model_name] = False
         return False
 
@@ -507,12 +505,16 @@ def _ensure_venv_dir(venv_dir: str, packages: tuple[str, ...], label: str) -> bo
 
 def _ensure_venv_t5_530_exists() -> bool:
     """Ensure .venv_t5_530/ exists with transformers 5.3.0."""
-    return _ensure_venv_dir(_VENV_T5_530_DIR, _VENV_T5_530_PACKAGES, "transformers 5.3.0")
+    return _ensure_venv_dir(
+        _VENV_T5_530_DIR, _VENV_T5_530_PACKAGES, "transformers 5.3.0"
+    )
 
 
 def _ensure_venv_t5_550_exists() -> bool:
     """Ensure .venv_t5_550/ exists with transformers 5.5.0."""
-    return _ensure_venv_dir(_VENV_T5_550_DIR, _VENV_T5_550_PACKAGES, "transformers 5.5.0")
+    return _ensure_venv_dir(
+        _VENV_T5_550_DIR, _VENV_T5_550_PACKAGES, "transformers 5.5.0"
+    )
 
 
 def _ensure_venv_t5_exists() -> bool: