diff --git a/custom_announcement b/custom_announcement
new file mode 160000
index 0000000..ddf868f
--- /dev/null
+++ b/custom_announcement
@@ -0,0 +1 @@
+Subproject commit ddf868fb2fced3f60036c1181b2a62ad0d96c604
diff --git a/custom_gallery b/custom_gallery
new file mode 160000
index 0000000..f959db8
--- /dev/null
+++ b/custom_gallery
@@ -0,0 +1 @@
+Subproject commit f959db8074d65af98c5e09df591438f67106467e
diff --git a/seminar.gemspec b/seminar.gemspec
index 9b18dd2..da941d4 100644
--- a/seminar.gemspec
+++ b/seminar.gemspec
@@ -22,4 +22,6 @@ Gem::Specification.new do |s|
   s.test_files = ["test/dummy", "test/dummy/app", "test/dummy/app/assets", "test/dummy/app/assets/javascripts", "test/dummy/app/assets/javascripts/application.js", "test/dummy/app/assets/images", "test/dummy/app/assets/stylesheets", "test/dummy/app/assets/stylesheets/application.css", "test/dummy/app/models", "test/dummy/app/models/concerns", "test/dummy/app/helpers", "test/dummy/app/helpers/application_helper.rb", "test/dummy/app/mailers", "test/dummy/app/views", "test/dummy/app/views/layouts", "test/dummy/app/views/layouts/application.html.erb", "test/dummy/app/controllers", "test/dummy/app/controllers/concerns", "test/dummy/app/controllers/application_controller.rb", "test/dummy/config", "test/dummy/config/routes.rb", "test/dummy/config/environments", "test/dummy/config/environments/test.rb", "test/dummy/config/environments/development.rb", "test/dummy/config/environments/production.rb", "test/dummy/config/initializers", "test/dummy/config/initializers/assets.rb", "test/dummy/config/initializers/session_store.rb", "test/dummy/config/initializers/wrap_parameters.rb", "test/dummy/config/initializers/filter_parameter_logging.rb", "test/dummy/config/initializers/inflections.rb", "test/dummy/config/initializers/mime_types.rb", "test/dummy/config/initializers/backtrace_silencers.rb", "test/dummy/config/initializers/cookies_serializer.rb", "test/dummy/config/secrets.yml", "test/dummy/config/boot.rb", "test/dummy/config/environment.rb", "test/dummy/config/database.yml", "test/dummy/config/application.rb", "test/dummy/config/locales", "test/dummy/config/locales/en.yml", "test/dummy/public", "test/dummy/public/500.html", "test/dummy/public/422.html", "test/dummy/public/404.html", "test/dummy/public/favicon.ico", "test/dummy/bin", "test/dummy/bin/rake", "test/dummy/bin/rails", "test/dummy/bin/bundle", "test/dummy/lib", "test/dummy/lib/assets", "test/dummy/config.ru", "test/dummy/Rakefile", "test/dummy/README.rdoc", "test/dummy/log", "test/seminar_test.rb", "test/helpers/seminar_helper_test.rb", "test/test_helper.rb", "test/controllers/seminar_controller_test.rb"]
 
   s.installed_by_version = "2.2.2" if s.respond_to? :installed_by_version
+  s.add_dependency "custom_announcement"
+  s.add_dependency "custom_gallery"
 end