South African athlete Caster Semenya is bringing her legal fight to participate in women’s sports to the European Court of Human Rights (ECHR), her latest bid to “put an end to the longstanding human rights violations by World Athletics against women athletes.” The lawsuit from the two-time Olympic champion challenges restrictions on testosterone levels in female athletes that prevents certain women from participating in international sports competitions. In a tweet Thursday morning, Semenya shared a press release from her lawyers, Norton Rose Fulbright, which said “Semenya’s ongoing fight for dignity, equality, and the human rights of women in sport took a crucial step forward with the filing of an application” to the ECHR. The lawsuit asks that the Strasbourg court find that “Switzerland has failed in its positive obligations to protect her against the violation of her rights.” In September 2020, Semenya lost her long-running legal battle at Switzerland’s Supreme Court, preventing her from competing at the Tokyo Olympics unless she agrees to medical interventions to lower her testosterone.