diff --git a/db/migrate/20230814055132_change_memos_content_size.rb b/db/migrate/20230814055132_change_memos_content_size.rb
new file mode 100644
index 000000000..e74ec5904
--- /dev/null
+++ b/db/migrate/20230814055132_change_memos_content_size.rb
@@ -0,0 +1,5 @@
+class ChangeMemosContentSize < ActiveRecord::Migration[5.2]
+  def change
+    change_column :memos, :content, :longtext
+  end
+end