diff --git a/Gemfile b/Gemfile
index d29d5c856..2a11f7477 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,7 +15,7 @@ unless RUBY_PLATFORM =~ /w32/
   gem 'nokogiri'
 end
 
-gem 'simple_xlsx_reader'
+#gem 'simple_xlsx_reader'
 gem 'wechat',path: 'lib/wechat'
 gem 'grack', path:'lib/grack'
 gem 'gitlab', path: 'lib/gitlab-cli'
diff --git a/db/migrate/20170918092326_modify_type_of_subject_for_challenge_chooses.rb b/db/migrate/20170918092326_modify_type_of_subject_for_challenge_chooses.rb
new file mode 100644
index 000000000..6294f3a48
--- /dev/null
+++ b/db/migrate/20170918092326_modify_type_of_subject_for_challenge_chooses.rb
@@ -0,0 +1,8 @@
+class ModifyTypeOfSubjectForChallengeChooses < ActiveRecord::Migration
+  def up
+    change_column :challenge_chooses, :subject, :text
+  end
+
+  def down
+  end
+end