How to update the rustc version of anchor project

[cryptostar7]

Hi, Everyone. I have one issue while using anchor project.
I am a fresher of Solana project and now I am using the documentations.

Recently, I create the new anchor project using anchor init nftminting and run the anchor build command.

But this error is occured:
error: package solana-program v1.18.1cannot be built because it requires rustc 1.72.0 or newer, while the currently active rustc version is 1.68.0-dev Either upgrade to rustc 1.72.0 or newer, or use cargo update -p solana-program@1.18.1 --precise ver whereveris the latest version ofsolana-program supporting rustc 1.68.0-dev

So I checked the my rustc version.
When I run the command rustc --version, the result is rustc 1.75.0 (82e1608df 2023-12-21).
Now I am using anchor-cli 0.29.0.

So this means now I am using rustc 1.75.0.
What is the reason and How to fix it? Hope your kind answers. Thanks for your kind time

[acheroncrypto]

Please see solana-labs/solana#31428 to understand why the error occurs.

You can update it by running:

solana-install init 1.18.0

Also, please use Solana StackExchange for questions.

[cryptostar7]

Hi, Thanks for your kind effort. I have a similar issue now, I dont know how to fix that. I cannot get answer from google.
Here is the error message.

error: package toml_edit v0.21.1cannot be built because it requires rustc 1.69 or newer, while the currently active rustc version is 1.68.0-dev Either upgrade to rustc 1.69 or newer, or use cargo update -p toml_edit@0.21.1 --precise ver whereveris the latest version oftoml_editsupporting rustc 1.68.0-dev

In the last case, I fixed the issue by solana-install init 1.18.1. But in this case, I cannot fix it.
What is the reason and how to fix it? Hope your kind answers.

[19-xiaogao]

I solved the problem.
Use this command.
cargo update -p solana-program --precise 1.17.17
My rustc version rustc 1.76.0
My solana version solana-cli 1.17.27
my anchor version 0.29.0
Good luck to you.