ypack run myapp.ypk Even with polished releases, problems can arise. Here are solutions to the top three issues reported so far with ypack 1.2.3 . Issue 1: error: unsupported compression method Solution : Your manifest likely specifies zlib . Edit .ypack-manifest.yml and change compression: zlib to compression: zstd . Alternatively, force legacy mode with --compression zlib . Issue 2: verify-integrity fails even on fresh bundles Solution : Check filesystem permissions. The command requires read access to all files in the bundle. On some SELinux-enforced systems, run restorecon -R /path/to/bundle . Issue 3: CPU usage spikes during decompression Solution : This is expected because zstd uses multi-threading by default. To limit cores, set environment variable:
On another machine without internet:
export YPACK_ZSTD_THREADS=2 Then rerun the decompression or run command. The ypack roadmap hints at version 1.3 (due Q4 2026) which will introduce delta updates —only changed files instead of full rebundling. However, the team has stated that ypack 1.2.3 will be the last minor release to support Python 2.7-based build scripts. If your CI relies on that, plan a migration. ypack 1.2.3