diff --git a/backend/open_webui/retrieval/web/brave.py b/backend/open_webui/retrieval/web/brave.py
index f785cbe779..ac2ef3325f 100644
--- a/backend/open_webui/retrieval/web/brave.py
+++ b/backend/open_webui/retrieval/web/brave.py
@@ -16,7 +16,7 @@ async def search_brave(
     api_key: str,
     query: str,
     count: int,
-    filter_list: list[str | None] | None = None,
+    filter_list: list[str] | None = None,
 ) -> list[SearchResult]:
     """Query the Brave Web Search API and return normalised results.
 
diff --git a/backend/open_webui/retrieval/web/google_pse.py b/backend/open_webui/retrieval/web/google_pse.py
index 3b5fe0d685..4cf6e18152 100644
--- a/backend/open_webui/retrieval/web/google_pse.py
+++ b/backend/open_webui/retrieval/web/google_pse.py
@@ -13,7 +13,7 @@ async def search_google_pse(
     search_engine_id: str,
     query: str,
     count: int,
-    filter_list: list[str | None] | None = None,
+    filter_list: list[str] | None = None,
     referer: str | None = None,
 ) -> list[SearchResult]:
     """Query Google Programmable Search Engine with automatic pagination.
diff --git a/backend/open_webui/retrieval/web/microsoft_web_iq.py b/backend/open_webui/retrieval/web/microsoft_web_iq.py
index 9d0df53e64..1e4de7442b 100644
--- a/backend/open_webui/retrieval/web/microsoft_web_iq.py
+++ b/backend/open_webui/retrieval/web/microsoft_web_iq.py
@@ -15,7 +15,7 @@ def search_microsoft_web_iq(
     api_key: str,
     query: str,
     count: int,
-    filter_list: list[str | None] | None = None,
+    filter_list: list[str] | None = None,
     language: str = 'en',
     user=None,
 ) -> list[SearchResult]:
diff --git a/backend/open_webui/retrieval/web/openserp.py b/backend/open_webui/retrieval/web/openserp.py
index a9276cb1a0..547e43f724 100644
--- a/backend/open_webui/retrieval/web/openserp.py
+++ b/backend/open_webui/retrieval/web/openserp.py
@@ -12,7 +12,7 @@ async def search_openserp(
     base_url: str,
     query: str,
     count: int,
-    filter_list: list[str | None] | None = None,
+    filter_list: list[str] | None = None,
 ) -> list[SearchResult]:
     """Query an OpenSERP instance and return normalised results.
 
diff --git a/backend/open_webui/retrieval/web/searxng.py b/backend/open_webui/retrieval/web/searxng.py
index 9de56b28de..a4b3139f24 100644
--- a/backend/open_webui/retrieval/web/searxng.py
+++ b/backend/open_webui/retrieval/web/searxng.py
@@ -40,7 +40,7 @@ async def search_searxng(
     query_url: str,
     query: str,
     count: int,
-    filter_list: list[str | None] | None = None,
+    filter_list: list[str] | None = None,
     **kwargs,
 ) -> list[SearchResult]:
     """Query a SearXNG instance and return results sorted by relevance score.
diff --git a/backend/open_webui/retrieval/web/serper.py b/backend/open_webui/retrieval/web/serper.py
index 048e076dac..5ac168f171 100644
--- a/backend/open_webui/retrieval/web/serper.py
+++ b/backend/open_webui/retrieval/web/serper.py
@@ -13,7 +13,7 @@ async def search_serper(
     api_key: str,
     query: str,
     count: int,
-    filter_list: list[str | None] | None = None,
+    filter_list: list[str] | None = None,
 ) -> list[SearchResult]:
     """Query the serper.dev Google Search API and return normalised results.
 
diff --git a/backend/open_webui/retrieval/web/serphouse.py b/backend/open_webui/retrieval/web/serphouse.py
index 7b8ae59ac0..209fca4fb8 100644
--- a/backend/open_webui/retrieval/web/serphouse.py
+++ b/backend/open_webui/retrieval/web/serphouse.py
@@ -9,7 +9,7 @@ async def search_serphouse(
     domain: str,
     query: str,
     count: int,
-    filter_list: list[str | None] | None = None,
+    filter_list: list[str] | None = None,
 ) -> list[SearchResult]:
     """Query SERPHouse and return normalised organic results."""
     session = await get_session()
diff --git a/backend/open_webui/retrieval/web/serpstack.py b/backend/open_webui/retrieval/web/serpstack.py
index 532246c11a..ab7365fb9d 100644
--- a/backend/open_webui/retrieval/web/serpstack.py
+++ b/backend/open_webui/retrieval/web/serpstack.py
@@ -12,7 +12,7 @@ async def search_serpstack(
     api_key: str,
     query: str,
     count: int,
-    filter_list: list[str | None] | None = None,
+    filter_list: list[str] | None = None,
     https_enabled: bool = True,
 ) -> list[SearchResult]:
     """Query the serpstack.com API and return normalised results.