OK, so current MariaDB 10.3.13 we have in Debian contains MariaDB Connector C 3.0.9
mariadb-10.3$ grep -rF 'SET(CPACK_PACKAGE_VERSION_' libmariadb/CMakeLists.txt SET(CPACK_PACKAGE_VERSION_MAJOR 3) SET(CPACK_PACKAGE_VERSION_MINOR 0) SET(CPACK_PACKAGE_VERSION_PATCH 9) This has been fixed upstream in MariaDB Connector C 3.0.10: https://github.com/MariaDB/mariadb-connector-c/pull/101 MariaDB 10.3.14 release preparations are in progress, so this can be fixed soon via the new upstream release: https://mariadb.com/kb/en/library/mariadb-10314-release-notes/