rubygems - Jekyll Dependency Error when Upgrading from 2.x to 3.x -

following the official update guide, upgraded jekyll 2.x jekyll 3.1.1.

after installation, running jekyll serve produced following error:

dependency error: yikes! looks don't have jekyll-markdown-block or 1 of dependencies installed. in order use jekyll configured, you'll need install gem. full error message ruby is: 'unable activate jekyll-markdown-block-1.1.0, because jekyll-3.1.1 conflicts jekyll (~> 2.0)' if run trouble, can find helpful resources @ http://jekyllrb.com/help/!

so there sudo gem update jekyll-markdown-block, error still persisted. tried update of gems:

sudo gem update `gem list | cut -d ' ' -f 1` 

and out of desperation, uninstalled all of gems (except core one, not permitted uninstall):

sudo gem uninstall `gem list | cut -d ' ' -f 1` 

i proceeded install jekyll normal (assuming working clean slate):

sudo gem install jekyll fetching: liquid-3.0.6.gem (100%) installed liquid-3.0.6 fetching: kramdown-1.9.0.gem (100%) installed kramdown-1.9.0 .... parsing documentation jekyll-watch-1.3.1 installing ri documentation jekyll-watch-1.3.1 parsing documentation jekyll-3.1.1 installing ri documentation jekyll-3.1.1 14 gems installed 

after installing jekyll-press , jekyll-markdown-block (a new error message complained didn't have them), received original error message complaining jekyll 2.x.

how can remove jekyll 2.x , complete upgrade without gem dependency errors?

i having same problem after updating jekylls 3.1.2 2.x. running jekyll serve, received following message:

dependency error: yikes! looks don't have kramdown or 1 of dependencies installed. in order use jekyll configured, you'll need install gem. full error message ruby is: 'cannot load such file -- kramdown' if run trouble, can find helpful resources @ http://jekyllrb.com/help/!

i did virtua creative suggest on comment:

bundle install 

and then:

bundle exec jekyll serve 

the initial command giving me same error, bundle exec works.