diff --git a/app/models/edu_setting.rb b/app/models/edu_setting.rb
index 4b39dea81..aadb6540c 100644
--- a/app/models/edu_setting.rb
+++ b/app/models/edu_setting.rb
@@ -20,6 +20,6 @@ class EduSetting < ApplicationRecord
   private
 
   def expire_value_cache
-    Rails.cache.clear(value_cache_key)
+    Rails.cache.write(value_cache_key, nil)
   end
 end