diff --git a/dinov2/hub/text/dinov2_wrapper.py b/dinov2/hub/text/dinov2_wrapper.py
index 31db29696..42c119470 100644
--- a/dinov2/hub/text/dinov2_wrapper.py
+++ b/dinov2/hub/text/dinov2_wrapper.py
@@ -1,4 +1,4 @@
-from typing import Sequence
+from typing import Sequence, Tuple, Union
 
 import torch
 
@@ -26,12 +26,12 @@ def forward(self, img, is_training: bool):
     def get_intermediate_layers(
         self,
         x: torch.Tensor,
-        n: int | Sequence[int] = 1,  # Layers or n last layers to take
+        n: Union[int, Sequence[int]] = 1,  # Layers or n last layers to take
         reshape: bool = False,
         return_class_token: bool = False,
         return_register_tokens: bool = False,
         norm=True,
-    ) -> tuple[torch.Tensor] | tuple[tuple[torch.Tensor, ...], ...]:
+    ) -> Union[Tuple[torch.Tensor], Tuple[Tuple[torch.Tensor, ...], ...]]:
         if self.model.chunked_blocks:
             outputs = self.model._get_intermediate_layers_chunked(x, n)
         else:
diff --git a/dinov2/layers/attention.py b/dinov2/layers/attention.py
index f1d3dabf1..ff9458914 100644
--- a/dinov2/layers/attention.py
+++ b/dinov2/layers/attention.py
@@ -11,6 +11,8 @@
 import os
 import warnings
 
+from typing import Optional
+
 import torch
 from torch import nn, Tensor
 
@@ -55,7 +57,7 @@ def __init__(
         self.proj_drop = nn.Dropout(proj_drop)
 
     def init_weights(
-        self, init_attn_std: float | None = None, init_proj_std: float | None = None, factor: float = 1.0
+        self, init_attn_std: Optional[float] = None, init_proj_std: Optional[float] = None, factor: float = 1.0
     ) -> None:
         init_attn_std = init_attn_std or (self.dim**-0.5)
         init_proj_std = init_proj_std or init_attn_std * factor
diff --git a/dinov2/layers/block.py b/dinov2/layers/block.py
index 7e83b71cc..d79f69093 100644
--- a/dinov2/layers/block.py
+++ b/dinov2/layers/block.py
@@ -147,9 +147,9 @@ def __init__(
 
     def init_weights(
         self,
-        init_attn_std: float | None = None,
-        init_proj_std: float | None = None,
-        init_fc_std: float | None = None,
+        init_attn_std: Optional[float] = None,
+        init_proj_std: Optional[float] = None,
+        init_fc_std: Optional[float] = None,
         factor: float = 1.0,
     ) -> None:
         init_attn_std = init_attn_std or (self.dim**-0.5)