How can I yum install devtoolset-7-7.0-8.el7 (gcc 7.2.1) on Red Hat Enterprise Server 7.4?

Hello,
I want to yum install devtoolset-7-7.0-8.el7 on Red Hat Enterprise Server 7.4
but get the message
Package devtoolset-7 is obsoleted by devtoolset-7, trying to install devtoolset-7-7.1-4.el7.x86_64 instead
In the package devtoolset-7 is e.g. devtoolset-7-gcc x86_64 7.3.1-5.10.el7

but I need gcc 7.2.1.

Thanks for the help,
Andreas.