diff --git a/backend/open_webui/env.py b/backend/open_webui/env.py
index dc160e1592..275e254957 100644
--- a/backend/open_webui/env.py
+++ b/backend/open_webui/env.py
@@ -159,7 +159,7 @@ ENABLE_DB_MIGRATIONS = os.getenv('ENABLE_DB_MIGRATIONS', 'True').lower() == 'tru
 # Swap the JSON encoder/decoder used across the app (HTTP request bodies, JSONResponse
 # bodies, upstream provider responses, socket.io payloads) from the stdlib `json` module
 # to orjson. Faster, but stricter: see open_webui/utils/json_codec.py for the differences.
-ENABLE_ORJSON = os.getenv('ENABLE_ORJSON', 'False').lower() == 'true'
+ENABLE_ORJSON = os.getenv('ENABLE_ORJSON', 'True').lower() == 'true'
 
 
 # Function to parse each section
diff --git a/backend/open_webui/main.py b/backend/open_webui/main.py
index ab9387e47f..694c62a543 100644
--- a/backend/open_webui/main.py
+++ b/backend/open_webui/main.py
@@ -502,7 +502,7 @@ async def lifespan(app: FastAPI):
     await publish_event(app, EVENTS.SYSTEM_SHUTDOWN_COMPLETED, source='system')
 
 
-# Opt-in (ENABLE_ORJSON): orjson for request-body parsing and JSONResponse bodies;
+# ENABLE_ORJSON: orjson for request-body parsing and JSONResponse bodies;
 # response_model routes keep FastAPI's Pydantic fast path either way.
 apply_orjson_http_json()