diff --git a/src/projected_grpo/train.py b/src/projected_grpo/train.py
index 1fe49b4..fc2d22a 100644
--- a/src/projected_grpo/train.py
+++ b/src/projected_grpo/train.py
@@ -415,7 +415,6 @@ def main(cfg: Config) -> int:
     if not v_hack_path.exists():
         from .extract_vhack_grad import extract_v_hack
         from .pairs import PAIRS as VHACK_PAIRS
-        from safetensors.torch import save_file
         logger.info(f"v_hack cache miss at {v_hack_path}; extracting (~5min)...")
         model.eval()  # match standalone extract: deterministic backward, no dropout
         v_hack_cpu_dict, raw_grads, _diag = extract_v_hack(