diff --git a/stac_pydantic/shared.py b/stac_pydantic/shared.py
index a34e8bd..110acc3 100644
--- a/stac_pydantic/shared.py
+++ b/stac_pydantic/shared.py
@@ -1,6 +1,6 @@
 from datetime import timezone
 from enum import Enum, auto
-from typing import Annotated, Any, Dict, List, Optional, Tuple, Union
+from typing import Any, Dict, List, Optional, Tuple, Union
 from warnings import warn
 
 from pydantic import (
@@ -11,6 +11,7 @@
     Field,
     PlainSerializer,
 )
+from typing_extensions import Annotated
 
 from stac_pydantic.utils import AutoValueEnum
 
@@ -30,6 +31,7 @@
     # Convert the input value to UTC timezone
     AfterValidator(lambda d: d.astimezone(timezone.utc)),
     # Use `isoformat` to serialize the value in an RFC3339 compatible format
+    # for example: "2024-01-01T00:00:00+00:00"
     PlainSerializer(lambda d: d.isoformat()),
 ]
 
@@ -119,7 +121,7 @@ class Provider(StacBaseModel):
     https://github.com/radiantearth/stac-spec/blob/v1.0.0/collection-spec/collection-spec.md#provider-object
     """
 
-    name: str = Field(..., alias="name", min_length=1)
+    name: str = Field(..., min_length=1)
     description: Optional[str] = None
     roles: Optional[List[str]] = None
     url: Optional[str] = None
@@ -130,18 +132,18 @@ class StacCommonMetadata(StacBaseModel):
     https://github.com/radiantearth/stac-spec/blob/v1.0.0/item-spec/common-metadata.md#date-and-time-range
     """
 
-    title: Optional[str] = Field(None, alias="title")
-    description: Optional[str] = Field(None, alias="description")
-    start_datetime: Optional[UtcDatetime] = Field(None, alias="start_datetime")
-    end_datetime: Optional[UtcDatetime] = Field(None, alias="end_datetime")
-    created: Optional[UtcDatetime] = Field(None, alias="created")
-    updated: Optional[UtcDatetime] = Field(None, alias="updated")
-    platform: Optional[str] = Field(None, alias="platform")
-    instruments: Optional[List[str]] = Field(None, alias="instruments")
-    constellation: Optional[str] = Field(None, alias="constellation")
-    mission: Optional[str] = Field(None, alias="mission")
-    providers: Optional[List[Provider]] = Field(None, alias="providers")
-    gsd: Optional[float] = Field(None, alias="gsd", gt=0)
+    title: Optional[str] = None
+    description: Optional[str] = None
+    start_datetime: Optional[UtcDatetime] = None
+    end_datetime: Optional[UtcDatetime] = None
+    created: Optional[UtcDatetime] = None
+    updated: Optional[UtcDatetime] = None
+    platform: Optional[str] = None
+    instruments: Optional[List[str]] = None
+    constellation: Optional[str] = None
+    mission: Optional[str] = None
+    providers: Optional[List[Provider]] = None
+    gsd: Optional[float] = Field(None, gt=0)
 
 
 class Asset(StacCommonMetadata):
@@ -149,11 +151,12 @@ class Asset(StacCommonMetadata):
     https://github.com/radiantearth/stac-spec/blob/v1.0.0/item-spec/item-spec.md#asset-object
     """
 
-    href: str = Field(..., alias="href", min_length=1)
+    href: str = Field(..., min_length=1)
     type: Optional[str] = None
     title: Optional[str] = None
     description: Optional[str] = None
     roles: Optional[List[str]] = None
+
     model_config = ConfigDict(
         populate_by_name=True, use_enum_values=True, extra="allow"
     )