diff --git a/.ruby-version b/.ruby-version
index 7921bd0..7636e75 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.8
+4.0.5
diff --git a/Gemfile b/Gemfile
index d3eb8ab..9652426 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 source 'https://rubygems.org'
-ruby '3.4.8'
+ruby '4.0.5'
 
 gem 'active_storage_validations'
 gem 'acts-as-taggable-on'
diff --git a/Gemfile.lock b/Gemfile.lock
index fcfe3aa..cd29482 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -93,11 +93,11 @@ GEM
       ffi-compiler (~> 1.0)
     ast (2.4.3)
     aws-eventstream (1.4.0)
-    aws-partitions (1.1241.0)
+    aws-partitions (1.1262.0)
     aws-sdk-cloudfront (1.143.0)
       aws-sdk-core (~> 3, >= 3.244.0)
       aws-sigv4 (~> 1.5)
-    aws-sdk-core (3.246.0)
+    aws-sdk-core (3.252.0)
       aws-eventstream (~> 1, >= 1.3.0)
       aws-partitions (~> 1, >= 1.992.0)
       aws-sigv4 (~> 1.9)
@@ -105,11 +105,11 @@ GEM
       bigdecimal
       jmespath (~> 1, >= 1.6.1)
       logger
-    aws-sdk-kms (1.123.0)
-      aws-sdk-core (~> 3, >= 3.244.0)
+    aws-sdk-kms (1.129.0)
+      aws-sdk-core (~> 3, >= 3.248.0)
       aws-sigv4 (~> 1.5)
-    aws-sdk-s3 (1.220.0)
-      aws-sdk-core (~> 3, >= 3.244.0)
+    aws-sdk-s3 (1.226.0)
+      aws-sdk-core (~> 3, >= 3.248.0)
       aws-sdk-kms (~> 1)
       aws-sigv4 (~> 1.5)
     aws-sigv4 (1.12.1)
@@ -174,7 +174,7 @@ GEM
       railties (>= 5.0)
     climate_control (1.2.0)
     coderay (1.1.3)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     crass (1.0.6)
     dalli (5.0.2)
@@ -219,7 +219,7 @@ GEM
       ruby-progressbar (~> 1.4)
     globalid (1.3.0)
       activesupport (>= 6.1)
-    i18n (1.14.8)
+    i18n (1.15.2)
       concurrent-ruby (~> 1.0)
     image_processing (1.14.0)
       mini_magick (>= 4.9.5, < 6)
@@ -238,7 +238,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.19.4)
+    json (2.20.0)
     language_server-protocol (3.17.0.5)
     launchy (3.1.1)
       addressable (~> 2.8)
@@ -266,11 +266,11 @@ GEM
       logger
     mini_mime (1.1.5)
     mini_portile2 (2.8.9)
-    minitest (6.0.5)
+    minitest (6.0.6)
       drb (~> 2.0)
       prism (~> 1.5)
     mutex_m (0.3.0)
-    net-imap (0.6.4)
+    net-imap (0.6.4.1)
       date
       net-protocol
     net-pop (0.1.2)
@@ -285,24 +285,24 @@ GEM
       net-protocol
     net-ssh (7.3.2)
     nio4r (2.7.5)
-    nokogiri (1.19.2)
+    nokogiri (1.19.4)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.19.2-aarch64-linux-gnu)
+    nokogiri (1.19.4-aarch64-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.19.2-aarch64-linux-musl)
+    nokogiri (1.19.4-aarch64-linux-musl)
       racc (~> 1.4)
-    nokogiri (1.19.2-arm-linux-gnu)
+    nokogiri (1.19.4-arm-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.19.2-arm-linux-musl)
+    nokogiri (1.19.4-arm-linux-musl)
       racc (~> 1.4)
-    nokogiri (1.19.2-arm64-darwin)
+    nokogiri (1.19.4-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.19.2-x86_64-darwin)
+    nokogiri (1.19.4-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.19.2-x86_64-linux-gnu)
+    nokogiri (1.19.4-x86_64-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.19.2-x86_64-linux-musl)
+    nokogiri (1.19.4-x86_64-linux-musl)
       racc (~> 1.4)
     ostruct (0.6.3)
     parallel (2.1.0)
@@ -329,7 +329,7 @@ GEM
       date
       stringio
     public_suffix (7.0.5)
-    puma (8.0.0)
+    puma (8.0.2)
       nio4r (~> 2.0)
     racc (1.8.1)
     rack (3.2.6)
@@ -410,7 +410,7 @@ GEM
       rspec-mocks (>= 3.13.0, < 5.0.0)
       rspec-support (>= 3.13.0, < 5.0.0)
     rspec-support (3.13.7)
-    rubocop (1.86.1)
+    rubocop (1.88.0)
       json (~> 2.3)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.1.0)
@@ -428,7 +428,7 @@ GEM
       lint_roller (~> 1.1)
       rubocop (>= 1.75.0, < 2.0)
       rubocop-ast (>= 1.47.1, < 2.0)
-    rubocop-rails (2.34.3)
+    rubocop-rails (2.35.5)
       activesupport (>= 4.2.0)
       lint_roller (~> 1.1)
       rack (>= 1.1)
@@ -582,7 +582,7 @@ DEPENDENCIES
   will_paginate
 
 RUBY VERSION
-   ruby 3.4.8p72
+   ruby 4.0.5p0
 
 BUNDLED WITH
    2.7.2
diff --git a/app/controllers/admin/tracks_controller.rb b/app/controllers/admin/tracks_controller.rb
index f97efa4..d9081d2 100644
--- a/app/controllers/admin/tracks_controller.rb
+++ b/app/controllers/admin/tracks_controller.rb
@@ -12,7 +12,7 @@ def index
     end
 
     def show
-      @track = Track.friendly.find(params[:id])
+      @track = Track.friendly.find(params.expect(:id))
 
       respond_to do |format|
         format.html # show.html.erb
@@ -30,13 +30,13 @@ def new
     end
 
     def clone
-      @track = Track.friendly.find(params[:id]).dup
+      @track = Track.friendly.find(params.expect(:id)).dup
       @track.published = false
       render 'new'
     end
 
     def edit
-      @track = Track.friendly.find(params[:id])
+      @track = Track.friendly.find(params.expect(:id))
     end
 
     def create
@@ -53,7 +53,7 @@ def create
     end
 
     def update
-      @track = Track.friendly.find(params[:id])
+      @track = Track.friendly.find(params.expect(:id))
       respond_to do |format|
         if @track.update(track_params)
           format.html { redirect_to admin_track_path(@track), notice: 'Track was successfully updated.' }
@@ -66,7 +66,7 @@ def update
     end
 
     def destroy
-      @track = Track.friendly.find(params[:id])
+      @track = Track.friendly.find(params.expect(:id))
       @track.destroy
 
       respond_to do |format|
diff --git a/app/controllers/tracks_controller.rb b/app/controllers/tracks_controller.rb
index 6f0f0d3..914a928 100644
--- a/app/controllers/tracks_controller.rb
+++ b/app/controllers/tracks_controller.rb
@@ -2,7 +2,7 @@
 
 class TracksController < ApplicationController
   def show
-    @track = Track.friendly.find(params[:id])
+    @track = Track.friendly.find(params.expect(:id))
     respond_to do |format|
       format.html
       format.json { render json: TrackSerializer.new(@track).serialized_json }
diff --git a/app/controllers/welcome_controller.rb b/app/controllers/welcome_controller.rb
index cd0183c..a6fafdc 100644
--- a/app/controllers/welcome_controller.rb
+++ b/app/controllers/welcome_controller.rb
@@ -19,6 +19,6 @@ def index
   def tags_params
     return unless params.key?(:tags)
 
-    [params[:tags].split(',')].flatten.map { |t| t.strip.downcase }.uniq.sort
+    [params.expect(:tags).split(',')].flatten.map { |t| t.strip.downcase }.uniq.sort
   end
 end