diff --git a/litellm/types/router.py b/litellm/types/router.py
index 5c721229cdf..0bdacb0b739 100644
--- a/litellm/types/router.py
+++ b/litellm/types/router.py
@@ -154,7 +154,7 @@ class TagRateLimitEntry(BaseModel):
 
 
 class TagRateLimitGroup(BaseModel):
-    limits: list[TagRateLimitEntry] = Field(default_factory=list)
+    limits: tuple[TagRateLimitEntry, ...] = ()
 
 
 class TagRateLimits(BaseModel):