Boost release 1.69.0 beta 1 is now available at: https://dl.bintray.com/boostorg/beta/1.69.0.beta1/source/ The SHA256 checksums are as follows: ee0ecd7d31f58474c1e0210089c9e66bd878d4d1e7436ac511e359aa4a9d3e86 ./boost_1_69_0_b1.7z 3e25c46f2171799caabbeb419ba7859fffb62208f3a1c80798713377ab07af0e ./boost_1_69_0_b1.tar.bz2 71f4b57175058af1b8c320971cf29226e5a652931a679f7e1c086655147ecafb ./boost_1_69_0_b1.tar.gz ec9ef7d2c9f0d41f560769e67bc7ff207cc999243a7dd6c3f6bcfbdbf0827a7b ./boost_1_69_0_b1.zip For details of what's in the release, see < https://www.boost.org/users/history/version_1_69_0.html>. Please download the beta, give it a try, and report any problems you encounter. Thanks, -- The Boost Release Team