diff --git a/webapp/ruby/app.rb b/webapp/ruby/app.rb
index 77f5512..4355587 100644
--- a/webapp/ruby/app.rb
+++ b/webapp/ruby/app.rb
@@ -57,9 +57,6 @@ def db_conn #:: Mysql2::Client[Mysql2::ResultAsHash]
         Thread.current[:db_conn] ||= connect_db
       end
 
-      # @rbs!
-      #   def self.db_conn: () -> Mysql2::Client[Mysql2::ResultAsHash]
-
       def connect_db #:: Mysql2::Client[Mysql2::ResultAsHash]
         Mysql2::Client.new(
           host: ENV.fetch('ISUCON13_MYSQL_DIALCONFIG_ADDRESS', '127.0.0.1'),
@@ -73,9 +70,6 @@ def connect_db #:: Mysql2::Client[Mysql2::ResultAsHash]
         )
       end
 
-      # @rbs!
-      #   def self.connect_db: () -> Mysql2::Client[Mysql2::ResultAsHash]
-
       #:: [T] () { (Mysql2::Client[Mysql2::ResultAsHash]) -> T } -> T
       def db_transaction(&block)
         db_conn.query('BEGIN')
@@ -92,9 +86,6 @@ def db_transaction(&block)
         end
       end
 
-      # @rbs!
-      #   def self.db_transaction: [T] () { (Mysql2::Client[Mysql2::ResultAsHash]) -> T } -> T
-
       # singleton(T) が動いてほしいなあ
       #:: (singleton(ReserveLivestreamRequest) | singleton(PostLivecommentRequest) | singleton(ModerateRequest) | singleton(PostReactionRequest) | singleton(PostIconRequest) | singleton(PostUserRequest) | singleton(LoginRequest) data_class) -> (ReserveLivestreamRequest | PostLivecommentRequest | ModerateRequest | PostReactionRequest | PostIconRequest | PostUserRequest | LoginRequest)
       def decode_request_body(data_class)
@@ -102,9 +93,6 @@ def decode_request_body(data_class)
         data_class.new(**data_class.members.map { |key| [key, body[key]] }.to_h)
       end
 
-      # @rbs!
-      #   def self.decode_request_body: (singleton(ReserveLivestreamRequest) | singleton(PostLivecommentRequest) | singleton(ModerateRequest) | singleton(PostReactionRequest) | singleton(PostIconRequest) | singleton(PostUserRequest) | singleton(LoginRequest) data_class) -> (ReserveLivestreamRequest | PostLivecommentRequest | ModerateRequest | PostReactionRequest | PostIconRequest | PostUserRequest | LoginRequest)
-
       # @rbs str: String
       # @rbs returns Integer
       def cast_as_integer(str)
@@ -113,9 +101,6 @@ def cast_as_integer(str)
         raise HttpError.new(400)
       end
 
-      # @rbs!
-      #   def self.cast_as_integer: (String str) -> Integer
-
       def verify_user_session! #:: nil
         sess = session[DEFAULT_SESSION_ID_KEY]
         unless sess
@@ -135,9 +120,6 @@ def verify_user_session! #:: nil
         nil
       end
 
-      # @rbs!
-      #   def self.verify_user_session!: () -> nil
-
       # @rbs tx: Mysql2::Client[Mysql2::ResultAsHash]
       # @rbs livestream_model: Hash[Symbol, Mysql2::row_value_type]
       # @rbs returns Hash[Symbol, untyped]
@@ -159,9 +141,6 @@ def fill_livestream_response(tx, livestream_model)
         )
       end
 
-      # @rbs!
-      #   def self.fill_livestream_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, Mysql2::row_value_type] livestream_model) -> Hash[Symbol, untyped]
-
       # @rbs tx: Mysql2::Client[Mysql2::ResultAsHash]
       # @rbs livecomment_model: Hash[Symbol, untyped]
       # @rbs returns Hash[Symbol, untyped]
@@ -178,9 +157,6 @@ def fill_livecomment_response(tx, livecomment_model)
         )
       end
 
-      # @rbs!
-      #   def self.fill_livecomment_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, untyped] livecomment_model) -> Hash[Symbol, untyped]
-
       # @rbs tx: Mysql2::Client[Mysql2::ResultAsHash]
       # @rbs report_model: Hash[Symbol, untyped]
       # @rbs returns Hash[Symbol, untyped]
@@ -197,9 +173,6 @@ def fill_livecomment_report_response(tx, report_model)
         )
       end
 
-      # @rbs!
-      #   def self.fill_livecomment_report_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, untyped] report_model) -> Hash[Symbol, untyped]
-
       # @rbs tx: Mysql2::Client[Mysql2::ResultAsHash]
       # @rbs reaction_model: Hash[Symbol, Mysql2::row_value_type]
       # @rbs returns Hash[Symbol, untyped]
@@ -216,9 +189,6 @@ def fill_reaction_response(tx, reaction_model)
         )
       end
 
-      # @rbs!
-      #   def self.fill_reaction_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, Mysql2::row_value_type] reaction_model) -> Hash[Symbol, untyped]                                   
-
       # @rbs tx: Mysql2::Client[Mysql2::ResultAsHash]
       # @rbs user_model: Hash[Symbol, Mysql2::row_value_type]
       # @rbs returns Hash[Symbol, untyped]
@@ -247,9 +217,6 @@ def fill_user_response(tx, user_model)
           icon_hash:,
         }
       end
-
-      # @rbs!
-      #   def self.fill_user_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, Mysql2::row_value_type] user_model) -> Hash[Symbol, untyped]
     end
 
     # 初期化
diff --git a/webapp/ruby/rbs_collection.lock.yaml b/webapp/ruby/rbs_collection.lock.yaml
index 8bcc79d..a2b6114 100644
--- a/webapp/ruby/rbs_collection.lock.yaml
+++ b/webapp/ruby/rbs_collection.lock.yaml
@@ -10,7 +10,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 1cbe291950e00d97d5a9a1929388523eb2d5b939
+    revision: 40bc6f347bd515583de8d04422ffdffd3e7766f0
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: cgi
@@ -22,7 +22,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 1cbe291950e00d97d5a9a1929388523eb2d5b939
+    revision: 40bc6f347bd515583de8d04422ffdffd3e7766f0
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: mysql2-cs-bind
@@ -30,7 +30,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 1cbe291950e00d97d5a9a1929388523eb2d5b939
+    revision: 40bc6f347bd515583de8d04422ffdffd3e7766f0
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: openssl
@@ -42,7 +42,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 1cbe291950e00d97d5a9a1929388523eb2d5b939
+    revision: 40bc6f347bd515583de8d04422ffdffd3e7766f0
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: sinatra
@@ -50,7 +50,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 1cbe291950e00d97d5a9a1929388523eb2d5b939
+    revision: 40bc6f347bd515583de8d04422ffdffd3e7766f0
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: sinatra-contrib
@@ -58,7 +58,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 1cbe291950e00d97d5a9a1929388523eb2d5b939
+    revision: 40bc6f347bd515583de8d04422ffdffd3e7766f0
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: socket
diff --git a/webapp/ruby/sig/generated/app.rbs b/webapp/ruby/sig/generated/app.rbs
index b2e5fe9..e9bcc81 100644
--- a/webapp/ruby/sig/generated/app.rbs
+++ b/webapp/ruby/sig/generated/app.rbs
@@ -27,68 +27,46 @@ module Isupipe
 
     def db_conn: () -> Mysql2::Client[Mysql2::ResultAsHash]
 
-    def self.db_conn: () -> Mysql2::Client[Mysql2::ResultAsHash]
-
     def connect_db: () -> Mysql2::Client[Mysql2::ResultAsHash]
 
-    def self.connect_db: () -> Mysql2::Client[Mysql2::ResultAsHash]
-
     # :: [T] () { (Mysql2::Client[Mysql2::ResultAsHash]) -> T } -> T
     def db_transaction: [T] () { (Mysql2::Client[Mysql2::ResultAsHash]) -> T } -> T
 
-    def self.db_transaction: [T] () { (Mysql2::Client[Mysql2::ResultAsHash]) -> T } -> T
-
     # singleton(T) が動いてほしいなあ
     # :: (singleton(ReserveLivestreamRequest) | singleton(PostLivecommentRequest) | singleton(ModerateRequest) | singleton(PostReactionRequest) | singleton(PostIconRequest) | singleton(PostUserRequest) | singleton(LoginRequest) data_class) -> (ReserveLivestreamRequest | PostLivecommentRequest | ModerateRequest | PostReactionRequest | PostIconRequest | PostUserRequest | LoginRequest)
     def decode_request_body: (singleton(ReserveLivestreamRequest) | singleton(PostLivecommentRequest) | singleton(ModerateRequest) | singleton(PostReactionRequest) | singleton(PostIconRequest) | singleton(PostUserRequest) | singleton(LoginRequest) data_class) -> (ReserveLivestreamRequest | PostLivecommentRequest | ModerateRequest | PostReactionRequest | PostIconRequest | PostUserRequest | LoginRequest)
 
-    def self.decode_request_body: (singleton(ReserveLivestreamRequest) | singleton(PostLivecommentRequest) | singleton(ModerateRequest) | singleton(PostReactionRequest) | singleton(PostIconRequest) | singleton(PostUserRequest) | singleton(LoginRequest) data_class) -> (ReserveLivestreamRequest | PostLivecommentRequest | ModerateRequest | PostReactionRequest | PostIconRequest | PostUserRequest | LoginRequest)
-
     # @rbs str: String
     # @rbs returns Integer
     def cast_as_integer: (String str) -> Integer
 
-    def self.cast_as_integer: (String str) -> Integer
-
     def verify_user_session!: () -> nil
 
-    def self.verify_user_session!: () -> nil
-
     # @rbs tx: Mysql2::Client[Mysql2::ResultAsHash]
     # @rbs livestream_model: Hash[Symbol, Mysql2::row_value_type]
     # @rbs returns Hash[Symbol, untyped]
     def fill_livestream_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, Mysql2::row_value_type] livestream_model) -> Hash[Symbol, untyped]
 
-    def self.fill_livestream_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, Mysql2::row_value_type] livestream_model) -> Hash[Symbol, untyped]
-
     # @rbs tx: Mysql2::Client[Mysql2::ResultAsHash]
     # @rbs livecomment_model: Hash[Symbol, untyped]
     # @rbs returns Hash[Symbol, untyped]
     def fill_livecomment_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, untyped] livecomment_model) -> Hash[Symbol, untyped]
 
-    def self.fill_livecomment_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, untyped] livecomment_model) -> Hash[Symbol, untyped]
-
     # @rbs tx: Mysql2::Client[Mysql2::ResultAsHash]
     # @rbs report_model: Hash[Symbol, untyped]
     # @rbs returns Hash[Symbol, untyped]
     def fill_livecomment_report_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, untyped] report_model) -> Hash[Symbol, untyped]
 
-    def self.fill_livecomment_report_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, untyped] report_model) -> Hash[Symbol, untyped]
-
     # @rbs tx: Mysql2::Client[Mysql2::ResultAsHash]
     # @rbs reaction_model: Hash[Symbol, Mysql2::row_value_type]
     # @rbs returns Hash[Symbol, untyped]
     def fill_reaction_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, Mysql2::row_value_type] reaction_model) -> Hash[Symbol, untyped]
 
-    def self.fill_reaction_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, Mysql2::row_value_type] reaction_model) -> Hash[Symbol, untyped]
-
     # @rbs tx: Mysql2::Client[Mysql2::ResultAsHash]
     # @rbs user_model: Hash[Symbol, Mysql2::row_value_type]
     # @rbs returns Hash[Symbol, untyped]
     def fill_user_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, Mysql2::row_value_type] user_model) -> Hash[Symbol, untyped]
 
-    def self.fill_user_response: (Mysql2::Client[Mysql2::ResultAsHash] tx, Hash[Symbol, Mysql2::row_value_type] user_model) -> Hash[Symbol, untyped]
-
     class ReserveLivestreamRequest
       extend Data::_DataClass
       attr_reader tags: Array[Integer]