diff --git a/app/views/layouts/base_courses.html.erb b/app/views/layouts/base_courses.html.erb
index 365b899cd..1881027d4 100644
--- a/app/views/layouts/base_courses.html.erb
+++ b/app/views/layouts/base_courses.html.erb
@@ -56,7 +56,7 @@
 
   <div class="sy_content">
     <div class="sy_class_l fl" id="courseLSide">
-      <% cache [:course_leftmenu,@course.id.to_s+"-"+@course.updated_at.to_i.to_s] do%>
+      <% cache [:course_leftmenu,@course.id.to_s+"-"+@course.updated_at.to_i.to_s],{ expires_in: 1.minutes  } do%>
           <div class="sy_class_leftnav mb12">
             <ul class="accordion">
               <% unless show_nav?(@course.course_activities.count) %>
diff --git a/config/environments/development.rb b/config/environments/development.rb
index e1ace8bcd..d69cd5a41 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -13,7 +13,7 @@ RedmineApp::Application.configure do
   config.consider_all_requests_local = true
   config.action_controller.perform_caching             = true
   # config.cache_store = :file_store,  "#{Rails.root }/files/cache_store/"
-  config.cache_store = :redis_store, 'redis://127.0.0.1:6379/0/cache', { expires_in: 1.minutes  }
+  config.cache_store = :redis_store, 'redis://127.0.0.1:6379/0/cache', { expires_in: 90.minutes  }
   #config.cache_store = :dalli_store
   # Don't care if the mailer can't send
   config.action_mailer.raise_delivery_errors = true