diff --git a/lib/plug/conn/utils.ex b/lib/plug/conn/utils.ex
index d104106f..e1d9c4e1 100644
--- a/lib/plug/conn/utils.ex
+++ b/lib/plug/conn/utils.ex
@@ -343,7 +343,7 @@ defmodule Plug.Conn.Utils do
 
       error_code when error_code in 100..999 ->
         :ok =
-          Logger.warn(
+          Logger.warning(
             "invalid UTF-8 on #{context}, got byte #{byte} in position #{byte_position}",
             error: @utf8_error_code,
             context: context,