Install ngBootstrap error: Could not resolve dependency

I want to install ng-Bootstrap and use the command ng add @ng-bootstrap/ng-bootstrap@11.0.0-beta.2 to get the latest beta version compatible with bootstrap 5 and angular 12.

But when running this command, those error messages pop up in the console:

ℹ Using package manager: npm
✔ Package information loaded.
 
The package @ng-bootstrap/ng-bootstrap@11.0.0-beta.2 will be installed and executed.
Would you like to proceed? Yes
npm ERR! code ERESOLVE
npm ERR! ERESOLVE could not resolve
npm ERR! 
npm ERR! While resolving: simplefileshare@0.0.0
npm ERR! Found: @angular/core@12.2.7
npm ERR! node_modules/@angular/core
npm ERR!   peer @angular/core@"12.2.7" from @angular/animations@12.2.7
npm ERR!   node_modules/@angular/animations
npm ERR!     peerOptional @angular/animations@"12.2.7" from @angular/platform-browser@12.2.7
npm ERR!     node_modules/@angular/platform-browser
npm ERR!       peer @angular/platform-browser@"12.2.7" from @angular/forms@12.2.7
npm ERR!       node_modules/@angular/forms
npm ERR!         @angular/forms@"~12.2.0" from the root project
npm ERR!       3 more (@angular/platform-browser-dynamic, @angular/router, the root project)
npm ERR!     @angular/animations@"~12.2.0" from the root project
npm ERR!   peer @angular/core@"12.2.7" from @angular/common@12.2.7
npm ERR!   node_modules/@angular/common
npm ERR!     peer @angular/common@"12.2.7" from @angular/forms@12.2.7
npm ERR!     node_modules/@angular/forms
npm ERR!       @angular/forms@"~12.2.0" from the root project
npm ERR!     peer @angular/common@"12.2.7" from @angular/platform-browser@12.2.7
npm ERR!     node_modules/@angular/platform-browser
npm ERR!       peer @angular/platform-browser@"12.2.7" from @angular/forms@12.2.7
npm ERR!       node_modules/@angular/forms
npm ERR!         @angular/forms@"~12.2.0" from the root project
npm ERR!       3 more (@angular/platform-browser-dynamic, @angular/router, the root project)
npm ERR!     3 more (@angular/platform-browser-dynamic, @angular/router, the root project)
npm ERR!   5 more (@angular/forms, @angular/platform-browser, ...)
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! @ng-bootstrap/ng-bootstrap@"11.0.0-beta.2" from the root project
npm ERR! 
npm ERR! Conflicting peer dependency: @angular/core@12.2.8
npm ERR! node_modules/@angular/core
npm ERR!   peer @angular/core@"12.2.8" from @angular/forms@12.2.8
npm ERR!   node_modules/@angular/forms
npm ERR!     @angular/forms@"~12.2.0" from the root project
npm ERR!     peer @angular/forms@"^12.0.0" from @ng-bootstrap/ng-bootstrap@11.0.0-beta.2
npm ERR!     node_modules/@ng-bootstrap/ng-bootstrap
npm ERR!       @ng-bootstrap/ng-bootstrap@"11.0.0-beta.2" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR! 
npm ERR! See /root/.npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2021-10-04T08_36_31_463Z-debug.log
✖ Package install failed, see above.

What do I miss here? I did install bootstrap 5 with npm and added it to the angular.json. Is there something else I need to do?

Edit:

Those are all my dependencies:

"dependencies": {
    "-": "^0.0.1",
    "@angular/animations": "~12.2.0",
    "@angular/common": "~12.2.0",
    "@angular/compiler": "~12.2.0",
    "@angular/core": "~12.2.0",
    "@angular/forms": "~12.2.0",
    "@angular/platform-browser": "~12.2.0",
    "@angular/platform-browser-dynamic": "~12.2.0",
    "@angular/router": "~12.2.0",
    "@popperjs/core": "^2.10.1",
    "bootstrap": "^5.0.0-beta3",
    "rxjs": "~6.6.0",
    "save": "^2.4.0",
    "tslib": "^2.3.0",
    "zone.js": "~0.11.4"
  }