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WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.1

or

WARNING: Nokogiri was built against LibXML version 2.9.1, but has dynamically loaded 2.9.0

rm vendor/.bundle
brew update
brew uninstall libxml2
brew install libxml2 --with-xml2-config
brew link --force libxml2
 
brew install libxslt
brew link --force libxslt

brew install libiconv
brew link --force libiconv
 
# bundle config build.nokogiri -- --with-xml2-dir=/usr/local --with-xslt-dir=/usr/local --with-iconv-dir=/usr/local
bundle config build.nokogiri -- --with-xml2-dir=/usr/local --with-xslt-dir=/usr/local --use-system-libraries
bundle install