diff --git a/py/local_groundingdino/models/GroundingDINO/bertwarper.py b/py/local_groundingdino/models/GroundingDINO/bertwarper.py
index e209a39..2ed4016 100644
--- a/py/local_groundingdino/models/GroundingDINO/bertwarper.py
+++ b/py/local_groundingdino/models/GroundingDINO/bertwarper.py
@@ -10,6 +10,19 @@ from torch import nn
 from transformers.modeling_outputs import BaseModelOutputWithPoolingAndCrossAttentions
 
 
+def _get_head_mask(num_hidden_layers, head_mask=None):
+    """Compatibility shim -- transformers 5.x removed get_head_mask from BertModel."""
+    if head_mask is not None:
+        if head_mask.dim() == 1:
+            head_mask = head_mask.unsqueeze(0).unsqueeze(0).unsqueeze(-1).unsqueeze(-1)
+            head_mask = head_mask.expand(num_hidden_layers, -1, -1, -1, -1)
+        elif head_mask.dim() == 2:
+            head_mask = head_mask.unsqueeze(1).unsqueeze(-1).unsqueeze(-1)
+    else:
+        head_mask = [None] * num_hidden_layers
+    return head_mask
+
+
 class BertModelWarper(nn.Module):
     def __init__(self, bert_model):
         super().__init__()
@@ -20,9 +33,31 @@ class BertModelWarper(nn.Module):
         self.encoder = bert_model.encoder
         self.pooler = bert_model.pooler
 
-        self.get_extended_attention_mask = bert_model.get_extended_attention_mask
         self.invert_attention_mask = bert_model.invert_attention_mask
-        self.get_head_mask = bert_model.get_head_mask
+        # transformers 5.x removed get_head_mask from BertModel; use fallback
+        if hasattr(bert_model, 'get_head_mask'):
+            self.get_head_mask = bert_model.get_head_mask
+        else:
+            self.get_head_mask = lambda head_mask, num_layers: _get_head_mask(num_layers, head_mask)
+
+    @staticmethod
+    def _get_extended_attention_mask(attention_mask, input_shape, device_or_dtype=None):
+        """Standalone extended attention mask compatible with all transformers versions.
+
+        transformers 5.x changed the 3rd positional arg of get_extended_attention_mask
+        from device to dtype, causing a TypeError when the old call-site passes a device.
+        Additionally, newer PyTorch forbids 1.0 - bool_tensor.
+        This method avoids both issues.
+        """
+        if attention_mask.dim() == 3:
+            extended = attention_mask[:, None, :, :]
+        elif attention_mask.dim() == 2:
+            extended = attention_mask[:, None, None, :]
+        else:
+            raise ValueError(f"Wrong shape for attention_mask (shape {attention_mask.shape})")
+        extended = extended.to(dtype=torch.float32)
+        extended = (1.0 - extended) * torch.finfo(torch.float32).min
+        return extended
 
     def forward(
         self,
@@ -102,8 +137,8 @@ class BertModelWarper(nn.Module):
 
         # We can provide a self-attention mask of dimensions [batch_size, from_seq_length, to_seq_length]
         # ourselves in which case we just need to make it broadcastable to all heads.
-        extended_attention_mask: torch.Tensor = self.get_extended_attention_mask(
-            attention_mask, input_shape, device
+        extended_attention_mask: torch.Tensor = self._get_extended_attention_mask(
+            attention_mask, input_shape
         )
 
         # If a 2D or 3D attention mask is provided for the cross-attention