What does the tilde (~) mean in my composer.json file?

Question

I have this line in my composer.json file:

\"require\": {
    ...
    \"friendsofsymfony/user-bundle\": \"~2.0@dev\",
    ...
},

What does

Answer 1

The tilde ~ in ~2.0@dev exactly mean to go up for immediate version :

For Example :

If we have ~2.0@dev it goes to up immediate next version => ~2.x@dev