Fails to run Jekyll 1.0.3 (conflicting versions of safe_yaml) on Mac OSX 10.8.3

Trying to run jekyll serve and getting errors about not being able to activate crack because of conflicting versions of dependency, safe_yaml. Jekyll requires ~>0.7.0 and crack ~>0.9.0.

Exact error:

Configuration file: /Users/antass/GitHub/labnotebook/_config.yml
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.7.8
/Users/antass/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1638:in `raise_if_conflicts': Unable to activate crack-0.4.0, because safe_yaml-0.7.0 conflicts with safe_yaml (~> 0.9.0) (Gem::LoadError)

Here's gem list:

    *** LOCAL GEMS ***

actionmailer (3.2.13)
actionpack (3.2.13)
activemodel (3.2.13)
activerecord (3.2.13)
activeresource (3.2.13)
activesupport (3.2.13, 3.1.12)
addressable (2.3.4)
arel (3.0.2)
bigdecimal (1.1.0)
builder (3.2.2, 3.0.4)
bundler (1.3.5)
bundler-unload (1.0.1)
chronic (0.9.1)
classifier (1.3.3)
colorator (0.1)
commander (4.1.3)
crack (0.4.0)
curb (0.7.18)
directory_watcher (1.4.1)
erubis (2.7.0)
faraday (0.8.7)
faraday_middleware (0.9.0)
fast-stemmer (1.0.2)
feedzirra (0.1.3)
garb (0.9.1)
hashie (2.0.5)
highline (1.6.19)
hike (1.2.3)
i18n (0.6.4, 0.6.1)
io-console (0.3)
jekyll (1.0.3)
jekyll-tagging (0.5.0)
journey (1.0.4)
json (1.8.0, 1.5.5)
kramdown (1.0.2)
liquid (2.5.0)
loofah (1.2.1)
mail (2.5.4)
maruku (0.6.1)
mime-types (1.23)
mini_portile (0.5.0)
minitest (2.5.1)
multi_json (1.7.7)
multipart-post (1.2.0)
netrc (0.7.7)
nokogiri (1.6.0)
octokit (1.24.0)
pandoc-ruby (0.7.0)
polyglot (0.3.3)
posix-spawn (0.3.6)
pygments.rb (0.5.0)
rack (1.4.5)
rack-cache (1.2)
rack-ssl (1.3.3)
rack-test (0.6.2)
rails (3.2.13)
railties (3.2.13)
rake (10.1.0, 10.0.4, 0.9.2.2)
rdoc (3.9.5)
ruby-nuggets (0.9.5)
rubygems-bundler (1.2.0)
rubygems-update (2.0.3)
rvm (1.11.3.8)
safe_yaml (0.9.3, 0.7.0)
sax-machine (0.1.0)
simple_oauth (0.2.0)
sprockets (2.2.2)
syntax (1.0.0)
thor (0.18.1)
tilt (1.4.1)
treetop (1.4.14)
twitter (4.8.1)
tzinfo (0.3.37)
yajl-ruby (1.1.0)

jnunemaker / crack

Fails to run Jekyll 1.0.3 (conflicting versions of safe_yaml) on Mac OSX 10.8.3 #45