diff --git a/scripts/harb-evaluator/red-team-sweep.sh b/scripts/harb-evaluator/red-team-sweep.sh
index cea8a9d..81e9223 100755
--- a/scripts/harb-evaluator/red-team-sweep.sh
+++ b/scripts/harb-evaluator/red-team-sweep.sh
@@ -19,6 +19,15 @@ TIMEOUT_PER="${1:-3600}"
 log() { echo "[sweep $(date -u +%H:%M:%S)] $*"; }
 die() { log "FATAL: $*" >&2; exit 1; }
 
+# ── Detect docker compose command (plugin vs legacy standalone) ────────
+if docker compose version &>/dev/null 2>&1; then
+  COMPOSE_CMD="docker compose"
+elif command -v docker-compose &>/dev/null; then
+  COMPOSE_CMD="docker-compose"
+else
+  die "docker compose not found. Install Docker with the compose plugin."
+fi
+
 [[ -f "$INJECT" ]] || die "inject.sh not found at $INJECT"
 
 mkdir -p "$ATTACKS_OUT"
@@ -51,7 +60,7 @@ SMOKE_SEED="${seeds[$SMOKE_IDX]}"
 SMOKE_NAME=$(basename "$SMOKE_SEED" .push3)
 log "Smoke test: $SMOKE_NAME"
 cp "$OPT_SOL" "${OPT_SOL}.sweep-backup"
-trap 'cp "${OPT_SOL}.sweep-backup" "$OPT_SOL" 2>/dev/null; rm -f "${OPT_SOL}.sweep-backup"; docker compose -f "$REPO_ROOT/docker-compose.yml" down -v 2>/dev/null || true' EXIT
+trap 'cp "${OPT_SOL}.sweep-backup" "$OPT_SOL" 2>/dev/null; rm -f "${OPT_SOL}.sweep-backup"; $COMPOSE_CMD -f "$REPO_ROOT/docker-compose.yml" down -v 2>/dev/null || true' EXIT
 
 bash "$INJECT" "$SMOKE_SEED" "$OPT_SOL" || die "Smoke test inject failed for $SMOKE_NAME"
 (cd "$REPO_ROOT/onchain" && forge build --silent 2>&1) || die "Smoke test compile failed for $SMOKE_NAME"
@@ -290,10 +299,10 @@ PYEOF
   log "DONE $seed_name"
 
   # 6. Teardown — poll until all containers have exited (exponential backoff, no fixed delay)
-  docker compose -f "$REPO_ROOT/docker-compose.yml" down -v 2>/dev/null || true
+  $COMPOSE_CMD -f "$REPO_ROOT/docker-compose.yml" down -v 2>/dev/null || true
   _deadline=$(( $(date +%s) + 30 ))
   _backoff_ms=100
-  while [[ -n "$(docker compose -f "$REPO_ROOT/docker-compose.yml" ps --quiet 2>/dev/null)" ]]; do
+  while [[ -n "$($COMPOSE_CMD -f "$REPO_ROOT/docker-compose.yml" ps --quiet 2>/dev/null)" ]]; do
     if [[ $(date +%s) -ge $_deadline ]]; then
       log "WARNING: containers still present after 30s — proceeding anyway"
       break