In C there's C89, C99, and C11; what about C++? Is there any upgrade since it came out?
C++98 (ISO/IEC 14882:1998) is the first edition.
C++03 (ISO/IEC 14882:2003) is the second edition and often considered a bugfix, but it has many changes.
C++11 is the third edition.
C++14 is the fourth edition.
C++17 was the next edition.
C++20 was the following edition.
C++23 was the following edition.
As can be seen, C++ is now updated every 3 years.
You can download PDFs of the standards and drafts.