Running ng update @angular/cli @angular/core I would get this every time
Package "@angular/compiler-cli" has an incompatible peer dependency to "@angular/compiler" (requires "8.2.0-next.1", would install "8.1.1") Package "ag-grid-angular" has an incompatible peer dependency to "@angular/compiler-cli" (requires ">=2.1.x" (extended), would install "8.2.0-next.1").
Package "angular-calendar" has an incompatible peer dependency to "@angular/core" (requires ">=5.0.0 <7.0.0" (extended), would install "8.1.1").
Package "@angular/compiler-cli" has an incompatible peer dependency to "@angular/compiler" (requires "8.2.0-next.1" (extended), would install "8.1.1").
Package "angular-calendar" has an incompatible peer dependency to "@angular/common" (requires ">=5.0.0 <7.0.0" (extended), would install "8.1.1").
Package "angular-calendar" has an incompatible peer dependency to "@angular/animations" (requires ">=5.0.0 <7.0.0" (extended), would install "8.1.1").
My Environment now is :
Angular CLI: 7.3.9
Node: 12.6.0
OS: win32 x64
Angular: 7.1.4
... common, compiler, compiler-cli, core, forms, http
... language-service, platform-browser, platform-browser-dynamic
... platform-server, router
Package Version
------------------------------------------------------------
@angular-devkit/architect 0.12.4
@angular-devkit/build-angular 0.12.4
@angular-devkit/build-optimizer 0.12.4
@angular-devkit/build-webpack 0.12.4
@angular-devkit/core 7.2.4
@angular-devkit/schematics 7.3.9
@angular/animations 7.2.15
@angular/cdk 7.3.7
@angular/cli 7.3.9
@angular/material 7.2.0
@angular/material-moment-adapter 7.3.7
@ngtools/webpack 7.2.4
@schematics/angular 7.3.9
@schematics/update 0.13.9
rxjs 6.5.2
typescript 3.4.5
webpack 4.28.4
