Where can I find GLIBCXX_3.4.29?

I updated my GCC compiler from the GIT repo to version 11. Now my test code (GoogleTest/GoogleMock) is complaining about GLIBCXX_3.4.29 not being found.This is not a duplicate please reopenThe answers posted in:Understanding the gcc version and the GLIBC, GLIBCXX versions in more detail (2 answers)doesn't answer the question.

Linker error is:

/usr/lib/x86_64-linux-gnu/libstdc++.so.6: version GLIBCXX_3.4.29 not found

The output of strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6 | grep GLIBCXX

GLIBCXX_3.4GLIBCXX_3.4.1GLIBCXX_3.4.2GLIBCXX_3.4.3GLIBCXX_3.4.4GLIBCXX_3.4.5GLIBCXX_3.4.6GLIBCXX_3.4.7GLIBCXX_3.4.8GLIBCXX_3.4.9GLIBCXX_3.4.10GLIBCXX_3.4.11GLIBCXX_3.4.12GLIBCXX_3.4.13GLIBCXX_3.4.14GLIBCXX_3.4.15GLIBCXX_3.4.16GLIBCXX_3.4.17GLIBCXX_3.4.18GLIBCXX_3.4.19GLIBCXX_3.4.20GLIBCXX_3.4.21GLIBCXX_3.4.22GLIBCXX_3.4.23GLIBCXX_3.4.24GLIBCXX_3.4.25GLIBCXX_3.4.26GLIBCXX_3.4.27GLIBCXX_3.4.28GLIBCXX_DEBUG_MESSAGE_LENGTH

Where can I find 3.4.29?