PokerStars No-Limit Hold'em, $2 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($151.60)
Hero ($200)
SB ($203.60)
BB ($284.30)
UTG ($229.15)
UTG+1 ($65.15)
MP1 ($67.70)
MP2 ($91.45)
MP3 ($44)

Preflop: Hero is Button with A, 3.
6 folds, Hero raises to $7, 1 fold, BB calls $5.

Flop: ($15) 3, 3, 5 (2 players)
BB checks, Hero bets $11, BB calls $11.

Turn: ($37) 8 (2 players)
BB checks, Hero bets $23, BB raises to $54, Hero ???

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BB is an unknown, I just got to the table. The minraise was very fast if that matters.

What's your move here?