diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 76a2259..f293108 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.4, 2.7, '3.0', 3.1, 3.2, truffleruby-head]
+        ruby: [2.7, '3.0', 3.1, 3.2, 3.3, 3.4, head, truffleruby-head]
 
     steps:
     - uses: actions/checkout@v3
@@ -22,13 +22,13 @@ jobs:
       run: |
         sudo apt-get install libsqlite3-dev
 
-    - name: Install legacy bundler for Ruby 2.4
-      if: ${{ matrix.ruby == 2.4 }}
+    - name: Install legacy bundler for Ruby 2.7
+      if: ${{ matrix.ruby == 2.7 }}
       run: |
-        gem install -q bundler -v 2.3.26 
+        gem install -q bundler -v 2.4.22
 
-    - name: Install bundler 2.4+ for modern Rubies
-      if: ${{ matrix.ruby != 2.4 }}
+    - name: Install bundler 2.7+ for modern Rubies
+      if: ${{ matrix.ruby != 2.7 }}
       run: |
         gem install -q bundler
 
diff --git a/.rubocop.yml b/.rubocop.yml
index 43747b4..2edc619 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,4 +1,4 @@
-require:
+plugins:
   - rubocop-performance
   - rubocop-rspec
 
@@ -23,7 +23,10 @@ Lint/DuplicateMethods:
   Exclude:
     - 'spec/fixtures/*.rb'
 
-RSpec/FilePath:
+RSpec/SpecFilePathFormat:
+  Enabled: false
+
+RSpec/SpecFilePathSuffix:
   Enabled: false
 
 RSpec/DescribedClass:
@@ -76,7 +79,7 @@ Layout/LineLength:
   Exclude:
     - 'lib/**/**.rb'
 
-Naming/PredicateName:
+Naming/PredicatePrefix:
   Exclude:
     - 'lib/**/**.rb'
 
diff --git a/jsonapi-serializer.gemspec b/jsonapi-serializer.gemspec
index d8ccb4a..22eb5ce 100644
--- a/jsonapi-serializer.gemspec
+++ b/jsonapi-serializer.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = ['lib']
   gem.extra_rdoc_files = ['LICENSE.txt', 'README.md']
 
-  gem.add_runtime_dependency('activesupport', '>= 4.2')
+  gem.add_dependency('activesupport', '>= 4.2')
 
   gem.add_development_dependency('activerecord')
   gem.add_development_dependency('bundler')
diff --git a/lib/fast_jsonapi/object_serializer.rb b/lib/fast_jsonapi/object_serializer.rb
index 04bd98d..417e3b8 100644
--- a/lib/fast_jsonapi/object_serializer.rb
+++ b/lib/fast_jsonapi/object_serializer.rb
@@ -117,7 +117,7 @@ def is_collection?(resource, force_is_collection = nil)
       end
 
       def inherited(subclass)
-        super(subclass)
+        super
         subclass.attributes_to_serialize = attributes_to_serialize.dup if attributes_to_serialize.present?
         subclass.relationships_to_serialize = relationships_to_serialize.dup if relationships_to_serialize.present?
         subclass.cachable_relationships_to_serialize = cachable_relationships_to_serialize.dup if cachable_relationships_to_serialize.present?
@@ -271,7 +271,7 @@ def create_relationship(base_key, relationship_type, options, block)
           name: name,
           id_method_name: compute_id_method_name(
             options[:id_method_name],
-            "#{base_serialization_key}#{id_postfix}".to_sym,
+            :"#{base_serialization_key}#{id_postfix}",
             polymorphic,
             options[:serializer],
             block
diff --git a/spec/fixtures/actor.rb b/spec/fixtures/actor.rb
index f212de1..0ffd494 100644
--- a/spec/fixtures/actor.rb
+++ b/spec/fixtures/actor.rb
@@ -6,7 +6,7 @@ class Actor < User
   attr_accessor :movies, :movie_ids
 
   def self.fake(id = nil)
-    faked = super(id)
+    faked = super
     faked.movies = []
     faked.movie_ids = []
     faked
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 4da35af..4e2ac77 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -8,6 +8,7 @@
 end
 
 require 'active_support'
+require 'active_support/core_ext/object'
 require 'active_support/core_ext/object/json'
 require 'jsonapi/serializer'
 require 'ffaker'