The GNU tools version

[KTarc]

The newest version of teh STM32cubeIDE comes with:

GNU Tools for STM32, based on GNU Tools for Arm Embedded Processors 7-2018-q2-update 7.3.1 20180622 (release) [ARM/embedded-7-branch revision 261907]

why not the newest one? Is there any reason to not use a newer version?

BR

KWT

[TDK]

There's always a balance between upgrading to the newest version of things or staying with the version you've been using a while and know operates correctly. Presumably they've chosen the latter for this.

It is possible to install your own toolchain and use that instead of the built-in one.

[KTarc]

could you please guide me how to do it?

[TDK]

Here is one option:

https://community.st.com/s/question/0D50X0000CBkla8/custom-toolchain-for-stm32cubeide