diff --git a/stac_fastapi/pgstac/app.py b/stac_fastapi/pgstac/app.py
index bde0548..10b0537 100644
--- a/stac_fastapi/pgstac/app.py
+++ b/stac_fastapi/pgstac/app.py
@@ -85,7 +85,9 @@
 else:
     collections_get_request_model = EmptyRequest
 
-post_request_model = create_post_request_model(extensions, base_model=PgstacSearch)
+post_request_model = create_post_request_model(
+    extensions + collection_extensions, base_model=PgstacSearch
+)
 get_request_model = create_get_request_model(extensions + collection_extensions)
 
 api = StacApi(
@@ -96,7 +98,6 @@
     items_get_request_model=items_get_request_model,
     search_get_request_model=get_request_model,
     search_post_request_model=post_request_model,
-    collections_get_request_model=collections_get_request_model,
 )
 app = api.app
 
diff --git a/stac_fastapi/pgstac/core.py b/stac_fastapi/pgstac/core.py
index d6aeb1e..56d150a 100644
--- a/stac_fastapi/pgstac/core.py
+++ b/stac_fastapi/pgstac/core.py
@@ -14,9 +14,6 @@
 from pygeofilter.parsers.cql2_text import parse as parse_cql2_text
 from pypgstac.hydration import hydrate
 from stac_fastapi.api.models import JSONResponse
-from stac_fastapi.extensions.core.collection_search.request import (
-    BaseCollectionSearchPostRequest,
-)
 from stac_fastapi.types.core import AsyncBaseCoreClient, Relations
 from stac_fastapi.types.errors import InvalidQueryParameter, NotFoundError
 from stac_fastapi.types.requests import get_base_url
@@ -41,10 +38,6 @@
 class CoreCrudClient(AsyncBaseCoreClient):
     """Client for core endpoints defined by stac."""
 
-    collections_post_request_model: BaseCollectionSearchPostRequest = attr.ib(
-        default=BaseCollectionSearchPostRequest
-    )
-
     async def all_collections(  # noqa: C901
         self,
         request: Request,
@@ -88,8 +81,7 @@ async def all_collections(  # noqa: C901
 
         # Do the request
         try:
-            search_request = self.collections_post_request_model(**clean)
-            # search_request = self.post_request_model(**clean)
+            search_request = self.post_request_model(**clean)
         except ValidationError as e:
             raise HTTPException(
                 status_code=400, detail=f"Invalid parameters provided {e}"