  In 1997, van Hamme conjectured 13 Ramanujan-type supercongruences labeled
(A.2)--(M.2). Using some combinatorial identities discovered by Sigma, we
extend (A.2) and (H.2) to supercongruences modulo $p^4$ for primes $p\equiv
3\pmod{4}$, which appear to be new.
