diff --git a/seminar.gemspec b/seminar.gemspec
index ff7a5c7..a1ce638 100644
--- a/seminar.gemspec
+++ b/seminar.gemspec
@@ -2,7 +2,7 @@
 # stub: seminar 0.0.1 ruby lib
 require "yaml"
 data = File.open(File.join(File.dirname(__FILE__), 'config', 'list.yml')).read
-$seminar_list = YAML::load(ERB.new(data).result(binding)).symbolize_keys
+$seminar_list = YAML.safe_load(ERB.new(data).result(binding))
 Gem::Specification.new do |s|
   s.name = "seminar"
   s.version = "0.0.1"