Hi all, Opened a PR to permanently fix the `-headerpad_max_install_names` regression that appeared in 46.0.4: https://github.com/pyca/cryptography/pull/14777 The short version: macOS 15 CI runners use Apple's new linker (ld_prime), which reserves much less Mach-O header padding than the old ld. Homebrew's install_name_tool needs that padding to rewrite dylib paths post-install. When it's absent, `brew install`/`brew upgrade` fails with: "Updated load commands do not fit in the header of _rust.abi3.so" The fix is three lines in src/rust/build.rs — emit -Wl,-headerpad_max_install_names via cargo:rustc-link-arg when targeting macOS. This is the same class of issue discussed in #7847 (2022). At the time, @reaperhulk noted there was no objection to adding the flag permanently. The symptom went away on its own then; the macos-13 → macos-15 runner migration brought it back for good. PR: https://github.com/pyca/cryptography/pull/14777 Thanksk Elena