diff --git a/litellm/proxy/_lazy_openapi_snapshot.py b/litellm/proxy/_lazy_openapi_snapshot.py
index a895a0809b1..d5b49a473df 100644
--- a/litellm/proxy/_lazy_openapi_snapshot.py
+++ b/litellm/proxy/_lazy_openapi_snapshot.py
@@ -18,6 +18,8 @@ from dataclasses import dataclass
 from pathlib import Path
 from typing import TYPE_CHECKING, Final
 
+from typing_extensions import ReadOnly, TypedDict
+
 if TYPE_CHECKING:
     from fastapi import FastAPI
 
@@ -90,9 +92,14 @@ def _normalize_operation_ids(paths: dict[str, dict]) -> None:
                     break
 
 
+class SnapshotFragment(TypedDict):
+    paths: ReadOnly[dict[str, dict[str, object]]]
+    components: ReadOnly[dict[str, dict[str, object]]]
+
+
 @dataclass(frozen=True, slots=True)
 class SnapshotResult:
-    fragments: dict[str, dict]
+    fragments: dict[str, SnapshotFragment]
     skipped: tuple[str, ...]
 
 
@@ -115,7 +122,7 @@ def generate_snapshot() -> SnapshotResult:
 
     skipped: Final = tuple(name for feat in LAZY_FEATURES if (name := _register_feature(app, feat)) is not None)
 
-    fragments: Final[dict[str, dict]] = {}
+    fragments: Final[dict[str, SnapshotFragment]] = {}
     used_operation_ids: Final[set[str]] = set()
     for feat in LAZY_FEATURES:
         feat_routes = [r for r in app.routes if feat.matches(getattr(r, "path", ""))]
diff --git a/tests/test_litellm/proxy/test_lazy_openapi_snapshot.py b/tests/test_litellm/proxy/test_lazy_openapi_snapshot.py
index c513bd83b66..f9ef98bc474 100644
--- a/tests/test_litellm/proxy/test_lazy_openapi_snapshot.py
+++ b/tests/test_litellm/proxy/test_lazy_openapi_snapshot.py
@@ -200,7 +200,10 @@ def test_main_refuses_to_write_a_snapshot_missing_skipped_features(tmp_path, cap
 
 def test_main_writes_sorted_snapshot_when_every_feature_loads(tmp_path):
     snapshot_file = tmp_path / "snapshot.json"
-    fragments = {"zeta": {"paths": {"/z": {}}, "components": {"schemas": {}}}, "alpha": {"paths": {}, "components": {"schemas": {}}}}
+    fragments = {
+        "zeta": {"paths": {"/z": {}}, "components": {"schemas": {}}},
+        "alpha": {"paths": {}, "components": {"schemas": {}}},
+    }
 
     assert main(snapshot_file, generate=lambda: SnapshotResult(fragments=fragments, skipped=())) == 0
     assert json.loads(snapshot_file.read_text()) == fragments