Conn. Gen. Stat. § 52-136: Amendment from contract to tort and vice versa.

The complaint in an action brought for breach of contract may be amended so as to set forth instead a cause of action founded on a tort, arising from the same transaction or subject of action; and any complaint founded on a tort may be amended so as to set forth instead a cause of action for a breach of contract arising out of the same transaction or subject of action.