diff --git a/python/pyproject.toml b/python/pyproject.toml
index ad4aef5aa..9ebc8a753 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -45,7 +45,7 @@ runtime_common = [
     "soundfile==0.13.1",
     "scipy",
     "torchao==0.9.0",
-    "transformers==4.54.1",
+    "transformers==4.55.0",
     "timm==1.0.16",
     "uvicorn",
     "uvloop",
diff --git a/python/sglang/srt/models/transformers.py b/python/sglang/srt/models/transformers.py
index 9ee2a14b2..9135dc915 100644
--- a/python/sglang/srt/models/transformers.py
+++ b/python/sglang/srt/models/transformers.py
@@ -219,7 +219,7 @@ class TransformersForCausalLM(nn.Module):
                 f"{type(self.model)} does not support tensor parallel yet!"
             )
 
-        tp_plan = self.model._tp_plan
+        tp_plan = getattr(self.model.config, "base_model_tp_plan", None) or {}
 
         def _tensor_parallel(module: nn.Module, prefix: str = ""):
             for child_name, child_module in module.named_children():