diff --git a/docker/mem0/main.py b/docker/mem0/main.py
index 56e3ec1..acc71d8 100644
--- a/docker/mem0/main.py
+++ b/docker/mem0/main.py
@@ -230,7 +230,11 @@ def add_memories(req: AddRequest):
 def search_memories(req: SearchRequest):
     """Search memories by semantic similarity + BM25 + entity boost."""
     mem = _get_memory()
-    params: dict[str, Any] = {"limit": req.limit}
+    # mem0 SDK renamed Memory.search()'s 'limit' param to 'top_k' in e6d6276b
+    # (2026-04-15, #4843). Passing 'limit=' here falls into **kwargs and is
+    # silently ignored, so top_k always defaults to 20 — making the benchmark's
+    # top_50/top_200 cutoffs ineffective. Pass 'top_k=' instead.
+    params: dict[str, Any] = {"top_k": req.limit}
     if req.user_id:
         params["user_id"] = req.user_id
     if req.agent_id: