diff --git a/src/titiler/core/pyproject.toml b/src/titiler/core/pyproject.toml
index 2c9facfdb..dba637710 100644
--- a/src/titiler/core/pyproject.toml
+++ b/src/titiler/core/pyproject.toml
@@ -33,6 +33,7 @@ dependencies = [
     "geojson-pydantic>=1.0,<2.0",
     "jinja2>=2.11.2,<4.0.0",
     "numpy",
+    "pystac<=1.8.3",
     "pydantic~=2.0",
     "rasterio",
     "rio-tiler>=6.0,<7.0",
diff --git a/src/titiler/mosaic/pyproject.toml b/src/titiler/mosaic/pyproject.toml
index 7c0d4b016..660a0bf81 100644
--- a/src/titiler/mosaic/pyproject.toml
+++ b/src/titiler/mosaic/pyproject.toml
@@ -30,6 +30,7 @@ classifiers = [
 dynamic = ["version"]
 dependencies = [
     "mercantile",
+    "pystac<=1.8.3",
     "pystac-client~=0.6.0",
     "morecantile>=5.0,<6.0",
     "titiler.core==0.14.0",
diff --git a/src/titiler/mosaic/titiler/mosaic/models/stac_pydantic/shared.py b/src/titiler/mosaic/titiler/mosaic/models/stac_pydantic/shared.py
index fa089b387..4dc81ce33 100644
--- a/src/titiler/mosaic/titiler/mosaic/models/stac_pydantic/shared.py
+++ b/src/titiler/mosaic/titiler/mosaic/models/stac_pydantic/shared.py
@@ -6,7 +6,7 @@
 from enum import Enum, auto
 from typing import List, Optional, Tuple, Union
 
-from pydantic import BaseModel, Extra, Field
+from pydantic import BaseModel, Field
 
 from titiler.mosaic.models.stac_pydantic.utils import AutoValueEnum
 
@@ -122,6 +122,6 @@ class Config:
         Configuration values for the shared asset
         """
 
-        allow_population_by_field_name = True
+        populate_by_name = True
         use_enum_values = True
-        extra = Extra.allow
+        extra = "allow"