Worked on the OpenXiangShan/buildroot repository to enhance build system reliability by upgrading the Flannel dependency to version 0.26.0. Focused on build system management using Makefile, the work involved updating the flannel.hash file with the correct SHA256 checksum for the new release and pinning the FLANNEL_VERSION in flannel.mk to ensure reproducible builds. This approach reduced version drift and mitigated potential security risks while maintaining compatibility for downstream users. The contribution centered on dependency maintenance, emphasizing stability and reproducibility in the build pipeline. No bugs were addressed during this period, with efforts concentrated on feature delivery and build process improvements.