Dear colleagues, In preparation for the Sherbrooke summer school we releases ALPS 1.3.1 including the following bug fixes: * the hexagonal lattice is now correctly defined a a 3D lattice * the default random number generator was switched to a Mersenne Twister * a bug in calculating total energies in a classical Heisenberg model with single ion anisotropy was fixed It can be downloaded from the ALPS server at http://alps.comp-phys.org/ Matthias Troyer