diff --git a/app/lib/activitypub/activity/follow.rb b/app/lib/activitypub/activity/follow.rb
index 75c88d964e..256d72acb9 100644
--- a/app/lib/activitypub/activity/follow.rb
+++ b/app/lib/activitypub/activity/follow.rb
@@ -60,19 +60,13 @@ class ActivityPub::Activity::Follow < ActivityPub::Activity
       already_accepted = friend.accepted?
       friend.update!(passive_state: :pending, active_state: :idle, passive_follow_activity_id: @json['id'])
     else
-      @friend = FriendDomain.new(domain: @account.domain, passive_state: :pending, passive_follow_activity_id: @json['id'])
-      @friend.inbox_url = @json['inboxUrl'].presence || @friend.default_inbox_url
-      @friend.save!
+      @friend = FriendDomain.create!(domain: @account.domain, passive_state: :pending, passive_follow_activity_id: @json['id'], inbox_url: @account.preferred_inbox_url)
     end
 
-    if already_accepted || Setting.unlocked_friend
-      friend.accept!
+    friend.accept! if already_accepted || Setting.unlocked_friend
 
-      # Notify for admin even if unlocked
-      notify_staff_about_pending_friend_server! unless already_accepted
-    else
-      notify_staff_about_pending_friend_server!
-    end
+    # Notify for admin
+    notify_staff_about_pending_friend_server! unless already_accepted
   end
 
   def friend
diff --git a/app/models/friend_domain.rb b/app/models/friend_domain.rb
index 88ebd9338b..2ca501e21d 100644
--- a/app/models/friend_domain.rb
+++ b/app/models/friend_domain.rb
@@ -116,6 +116,7 @@ class FriendDomain < ApplicationRecord
       object: ActivityPub::TagManager::COLLECTIONS[:public],
 
       # Cannot use inbox_url method because this model also has inbox_url column
+      # This is deprecated property. Newer version's kmyblue will ignore it.
       inboxUrl: "https://#{Rails.configuration.x.web_domain}/inbox",
     }
   end
diff --git a/docker-compose.yml b/docker-compose.yml
index d7958cedfd..5ed44bd82c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -59,7 +59,7 @@ services:
   web:
     # You can uncomment the following line if you want to not use the prebuilt image, for example if you have local code changes
     build: .
-    image: kmyblue:16.0-dev
+    image: kmyblue:16.0
     restart: always
     env_file: .env.production
     command: bundle exec puma -C config/puma.rb
@@ -83,7 +83,7 @@ services:
     build:
       dockerfile: ./streaming/Dockerfile
       context: .
-    image: kmyblue-streaming:16.0-dev
+    image: kmyblue-streaming:16.0
     restart: always
     env_file: .env.production
     command: node ./streaming/index.js
@@ -101,7 +101,7 @@ services:
 
   sidekiq:
     build: .
-    image: kmyblue:16.0-dev
+    image: kmyblue:16.0
     restart: always
     env_file: .env.production
     command: bundle exec sidekiq
diff --git a/lib/mastodon/version.rb b/lib/mastodon/version.rb
index b57856e472..30f4e62655 100644
--- a/lib/mastodon/version.rb
+++ b/lib/mastodon/version.rb
@@ -18,8 +18,8 @@ module Mastodon
 
     def kmyblue_flag
       # 'LTS'
-      'dev'
-      # nil
+      # 'dev'
+      nil
     end
 
     def major
diff --git a/spec/lib/activitypub/activity/follow_spec.rb b/spec/lib/activitypub/activity/follow_spec.rb
index ec0e5e4eef..12c30feb28 100644
--- a/spec/lib/activitypub/activity/follow_spec.rb
+++ b/spec/lib/activitypub/activity/follow_spec.rb
@@ -380,11 +380,10 @@ RSpec.describe ActivityPub::Activity::Follow do
   context 'when given a friend server' do
     subject { described_class.new(json, sender) }
 
-    let(:sender) { Fabricate(:account, domain: 'abc.com', url: 'https://abc.com/#actor') }
+    let(:sender) { Fabricate(:account, domain: 'abc.com', url: 'https://abc.com/#actor', shared_inbox_url: 'https://abc.com/shared_inbox') }
     let!(:friend) { Fabricate(:friend_domain, domain: 'abc.com', inbox_url: 'https://example.com/inbox', passive_state: :idle) }
     let!(:owner_user) { Fabricate(:user, role: UserRole.find_by(name: 'Owner')) }
     let!(:patch_user) { Fabricate(:user, role: Fabricate(:user_role, name: 'OhagiOps', permissions: UserRole::FLAGS[:manage_federation])) }
-    let(:inbox_url) { nil }
 
     let(:json) do
       {
@@ -393,7 +392,6 @@ RSpec.describe ActivityPub::Activity::Follow do
         type: 'Follow',
         actor: ActivityPub::TagManager.instance.uri_for(sender),
         object: 'https://www.w3.org/ns/activitystreams#Public',
-        inboxUrl: inbox_url,
       }.with_indifferent_access
     end
 
@@ -415,25 +413,34 @@ RSpec.describe ActivityPub::Activity::Follow do
         expect(friend).to_not be_nil
         expect(friend.they_are_pending?).to be true
         expect(friend.passive_follow_activity_id).to eq 'foo'
-        expect(friend.inbox_url).to eq 'https://abc.com/inbox'
+        expect(friend.inbox_url).to eq 'https://abc.com/shared_inbox'
       end
     end
 
-    context 'when no record and inbox_url is specified' do
-      let(:inbox_url) { 'https://ohagi.com/inbox' }
+    context 'when old spec which no record and inbox_url is specified' do
+      let(:json) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: 'foo',
+          type: 'Follow',
+          actor: ActivityPub::TagManager.instance.uri_for(sender),
+          object: 'https://www.w3.org/ns/activitystreams#Public',
+          inboxUrl: 'https://evil.org/bad_inbox',
+        }.with_indifferent_access
+      end
 
       before do
         friend.destroy!
       end
 
-      it 'marks the friend as pending' do
+      it 'marks the friend as pending but inboxUrl is not working' do
         subject.perform
 
         friend = FriendDomain.find_by(domain: 'abc.com')
         expect(friend).to_not be_nil
         expect(friend.they_are_pending?).to be true
         expect(friend.passive_follow_activity_id).to eq 'foo'
-        expect(friend.inbox_url).to eq 'https://ohagi.com/inbox'
+        expect(friend.inbox_url).to eq 'https://abc.com/shared_inbox'
       end
     end
 
diff --git a/spec/models/friend_domain_spec.rb b/spec/models/friend_domain_spec.rb
index 336f921ebd..d3992ed149 100644
--- a/spec/models/friend_domain_spec.rb
+++ b/spec/models/friend_domain_spec.rb
@@ -21,7 +21,6 @@ RSpec.describe FriendDomain do
         type: 'Follow',
         actor: 'https://cb6e6126.ngrok.io/actor',
         object: 'https://www.w3.org/ns/activitystreams#Public',
-        inboxUrl: 'https://cb6e6126.ngrok.io/inbox',
       }))).to have_been_made.once
     end
   end