There are also ABI breaks not affecting the API, so just re-compiling the program is sufficient in that case.
Tepl 6.0 to Tepl 6.2:
The tepl_utils_override_font() function has been renamed
to tepl_utils_override_font_string().
Tepl 6.2 to Tepl 6.4:
The tepl_statusbar_*() functions have been removed, you
can use
TeplLineColumnIndicator
instead.