[CentOS] happy new year :D i have a problem to upgrade my glibc to 2.7 on centos 5.5

I have a executable and when i run it then the error comes:

/lib64/libc.so.6: version 'GLIBC_2.7' not found

I don't have the source code of the executable. And I can't find glibc 2.7
for centos 5.5.
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