diff --git a/backend/lib/tasks/link_nico.rake b/backend/lib/tasks/link_nico.rake
deleted file mode 100644
index 0c02f48..0000000
--- a/backend/lib/tasks/link_nico.rake
+++ /dev/null
@@ -1,12 +0,0 @@
-namespace :nico do
-  desc 'ニコタグ連携'
-  task link: :environment do
-    Post.find_each do |post|
-      tags = post.tags.where(category: 'nico')
-      tags.each do |tag|
-        post.tags.concat(tag.linked_tags) if tag.linked_tags.present?
-      end
-      post.tags = post.tags.to_a.uniq
-    end
-  end
-end