The Brewers released Rengifo on Tuesday, Curt Hogg of the Milwaukee Journal Sentinel reports.
The veteran infielder was designated for assignment last week and will now hit the open market. Rengifo joined Milwaukee on a one-year, $3.5 million contract during the offseason but struggled to a .205/.280/.254 slash line with no homers, three steals, 19 RBI and 19 runs in 57 games.