diff --git a/src/fastmcp/server/middleware/middleware.py b/src/fastmcp/server/middleware/middleware.py
index 0b78e4866..ba2d25c23 100644
--- a/src/fastmcp/server/middleware/middleware.py
+++ b/src/fastmcp/server/middleware/middleware.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import logging
-from collections.abc import Awaitable
+from collections.abc import Awaitable, Sequence
 from dataclasses import dataclass, field, replace
 from datetime import datetime, timezone
 from functools import partial
@@ -164,8 +164,10 @@ class Middleware:
     async def on_read_resource(
         self,
         context: MiddlewareContext[mt.ReadResourceRequestParams],
-        call_next: CallNext[mt.ReadResourceRequestParams, list[ReadResourceContents]],
-    ) -> list[ReadResourceContents]:
+        call_next: CallNext[
+            mt.ReadResourceRequestParams, Sequence[ReadResourceContents]
+        ],
+    ) -> Sequence[ReadResourceContents]:
         return await call_next(context)
 
     async def on_get_prompt(
@@ -178,27 +180,29 @@ class Middleware:
     async def on_list_tools(
         self,
         context: MiddlewareContext[mt.ListToolsRequest],
-        call_next: CallNext[mt.ListToolsRequest, list[Tool]],
-    ) -> list[Tool]:
+        call_next: CallNext[mt.ListToolsRequest, Sequence[Tool]],
+    ) -> Sequence[Tool]:
         return await call_next(context)
 
     async def on_list_resources(
         self,
         context: MiddlewareContext[mt.ListResourcesRequest],
-        call_next: CallNext[mt.ListResourcesRequest, list[Resource]],
-    ) -> list[Resource]:
+        call_next: CallNext[mt.ListResourcesRequest, Sequence[Resource]],
+    ) -> Sequence[Resource]:
         return await call_next(context)
 
     async def on_list_resource_templates(
         self,
         context: MiddlewareContext[mt.ListResourceTemplatesRequest],
-        call_next: CallNext[mt.ListResourceTemplatesRequest, list[ResourceTemplate]],
-    ) -> list[ResourceTemplate]:
+        call_next: CallNext[
+            mt.ListResourceTemplatesRequest, Sequence[ResourceTemplate]
+        ],
+    ) -> Sequence[ResourceTemplate]:
         return await call_next(context)
 
     async def on_list_prompts(
         self,
         context: MiddlewareContext[mt.ListPromptsRequest],
-        call_next: CallNext[mt.ListPromptsRequest, list[Prompt]],
-    ) -> list[Prompt]:
+        call_next: CallNext[mt.ListPromptsRequest, Sequence[Prompt]],
+    ) -> Sequence[Prompt]:
         return await call_next(context)