Rakefile in semantic_logger-0.7.1 vs Rakefile in semantic_logger-0.8.0

@@ -20,9 +20,10 @@
     spec.summary     = "Semantic Logger for Ruby, and Ruby on Rails"
     spec.description = "Machine readable document oriented logging with support for MongoDB and text files"
     spec.files       = FileList["./**/*"].exclude('*.gem', 'nbproject').map{|f| f.sub(/^\.\//, '')}
     spec.has_rdoc    = true
     spec.add_dependency 'sync_attr'
+    spec.add_dependency 'thread_safe'
     spec.add_development_dependency 'shoulda'
   end
   Gem::Builder.new(gemspec).build
 end