diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d18e31b6..22b8c6e4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rubyversion: ['2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4']
+        rubyversion: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4']
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 690f88e7..520b2edd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # CHANGELOG
 
-## Next Release (minor)
+## Next Release
 
 - Adds Ruby 3.4 support
 - Fixes error parsing
@@ -8,7 +8,11 @@
   - Corrects available properties of an `EasyPostError` and `ApiError` (`code` and `field` removed from `EasyPostError`, `message` unfurled and explicitly added to `ApiError`)
   - Removes unused `Error` model
 - Corrects the HTTP verb for updating a brand from `GET` to `PATCH`
-- Removes the deprecated `create_list` tracker endpoint function as it is no longer available via API
+- Removes deprecated `create_list` tracker endpoint function as it is no longer available via API
+- Removes deprecated `user.all_api_keys` and `user.api_keys`, use `api_key.all` and `api_key.retrieve_api_keys_for_user` respectively
+- Removes unmaintained and undocumented `irb`
+- Removes unused `Rakefile`
+- Bumps all dev dependencies
 
 ## v6.4.1 (2024-08-09)
 
diff --git a/Makefile b/Makefile
index 2b0a19b2..a315b82d 100644
--- a/Makefile
+++ b/Makefile
@@ -13,8 +13,7 @@ clean:
 	rm -rf coverage doc *.gem dist
 
 ## coverage - Generate a test coverage report
-coverage:
-	make test
+coverage: test
 
 ## docs - Generate documentation for the library
 docs:
diff --git a/Rakefile b/Rakefile
deleted file mode 100644
index 7398a900..00000000
--- a/Rakefile
+++ /dev/null
@@ -1,3 +0,0 @@
-# frozen_string_literal: true
-
-require 'bundler/gem_tasks'
diff --git a/bin/easypost-irb b/bin/easypost-irb
deleted file mode 100755
index 6793f932..00000000
--- a/bin/easypost-irb
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/usr/bin/env ruby
-# frozen_string_literal: true
-
-irb = RUBY_PLATFORM =~ /(:?mswin|mingw)/ ? 'irb.bat' : 'irb'
-
-libs = ' -r irb/completion'
-libs << " -r #{"#{File.dirname(__FILE__)}/../lib/easypost"}"
-puts 'Initializing EasyPost...'
-exec "#{irb} #{libs} --simple-prompt"
diff --git a/easypost.gemspec b/easypost.gemspec
index 8397a057..810e3d84 100644
--- a/easypost.gemspec
+++ b/easypost.gemspec
@@ -17,26 +17,23 @@ Gem::Specification.new do |spec|
   spec.files = `git ls-files -z`.split("\x0").reject do |f|
     f.match(%r{^(docs|examples|spec)/})
   end
-  spec.executables = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
-  spec.required_ruby_version = '>= 2.6'
+  spec.required_ruby_version = '>= 2.7'
 
   spec.add_development_dependency 'abbrev', '~> 0.1'
   spec.add_development_dependency 'benchmark', '~> 0.4'
   spec.add_development_dependency 'bigdecimal', '~> 3'
-  spec.add_development_dependency 'brakeman', '~> 5.4'
-  spec.add_development_dependency 'faraday', '~> 2.7.5' # used for integration tests
+  spec.add_development_dependency 'brakeman', '~> 5.4' # can't upgrade to 6.x, requires Ruby 3.0
+  spec.add_development_dependency 'faraday', '~> 2.8' # can't upgrade to 2.9, requires Ruby 3.0
   spec.add_development_dependency 'logger', '~> 1'
   spec.add_development_dependency 'ostruct', '~> 0.6'
-  spec.add_development_dependency 'pry', '~> 0.14'
-  spec.add_development_dependency 'rake', '~> 13.0'
-  spec.add_development_dependency 'rdoc', '~> 6.9'
-  spec.add_development_dependency 'rspec', '~> 3.12'
-  spec.add_development_dependency 'rubocop', '~> 1.49'
-  spec.add_development_dependency 'rubocop-rspec', '2.19' # pin to 2.19 because latest version doesn't support Ruby 2.6
+  spec.add_development_dependency 'rdoc', '~> 6.12'
+  spec.add_development_dependency 'rspec', '~> 3.13'
+  spec.add_development_dependency 'rubocop', '= 1.73'
+  spec.add_development_dependency 'rubocop-rspec', '2.31' # can't upgrade to 3.0, requires easycop config changes
   spec.add_development_dependency 'simplecov', '~> 0.22'
   spec.add_development_dependency 'simplecov-lcov', '~> 0.8'
-  spec.add_development_dependency 'typhoeus', '~> 1.4.0' # used for integration tests
-  spec.add_development_dependency 'vcr', '~> 6.1'
-  spec.add_development_dependency 'webmock', '~> 3.18'
+  spec.add_development_dependency 'typhoeus', '~> 1.4'
+  spec.add_development_dependency 'vcr', '~> 6.3'
+  spec.add_development_dependency 'webmock', '~> 3.25'
 end
diff --git a/examples b/examples
index 7669825f..29493728 160000
--- a/examples
+++ b/examples
@@ -1 +1 @@
-Subproject commit 7669825fb53be074d7f585c78c4f38ad4fefe0d0
+Subproject commit 2949372817661e824d9f85903678fb14fffa7835
diff --git a/lib/easypost/services/report.rb b/lib/easypost/services/report.rb
index 450ac476..4fcd0e52 100644
--- a/lib/easypost/services/report.rb
+++ b/lib/easypost/services/report.rb
@@ -6,7 +6,7 @@ class EasyPost::Services::Report < EasyPost::Services::Service
   # Create a Report
   def create(params = {})
     unless params[:type]
-      raise ArgumentError, "Missing 'type' parameter in params" # TODO: replace the error in the error-handling overhaul PR
+      raise EasyPost::Errors::MISSING_REQUIRED_PARAMETER.new('type')
     end
 
     type = params.delete(:type)
@@ -26,7 +26,7 @@ def retrieve(id)
   # Retrieve all Report objects
   def all(params = {})
     unless params[:type]
-      raise ArgumentError, "Missing 'type' parameter in params" # TODO: replace the error in the error-handling overhaul PR
+      raise EasyPost::Errors::MISSING_REQUIRED_PARAMETER.new('type')
     end
 
     type = params.delete(:type)
diff --git a/lib/easypost/services/user.rb b/lib/easypost/services/user.rb
index 063643cc..9a850053 100644
--- a/lib/easypost/services/user.rb
+++ b/lib/easypost/services/user.rb
@@ -39,38 +39,6 @@ def delete(id)
     true
   end
 
-  # Retrieve a list of all ApiKey objects.
-  def all_api_keys
-    warn '[DEPRECATION] `all_api_keys` is deprecated. Please use `all` in the `api_key` service instead.'
-    response = @client.make_request(:get, 'api_keys')
-
-    EasyPost::InternalUtilities::Json.convert_json_to_object(response, EasyPost::Models::ApiKey)
-  end
-
-  # Retrieve a list of ApiKey objects (works for the authenticated user or a child user).
-  def api_keys(id)
-    warn '[DEPRECATION] `api_keys` is deprecated.
-Please use `retrieve_api_keys_for_user` in the `api_key` service instead.'
-
-    api_keys = all_api_keys
-
-    if api_keys.id == id
-      # This function was called on the authenticated user
-      my_api_keys = api_keys.keys
-    else
-      # This function was called on a child user (authenticated as parent, only return this child user's details).
-      my_api_keys = []
-      api_keys.children.each do |child|
-        if child.id == id
-          my_api_keys = child.keys
-          break
-        end
-      end
-    end
-
-    my_api_keys
-  end
-
   # Update the Brand of a User.
   def update_brand(id, params = {})
     wrapped_params = { brand: params }
diff --git a/spec/address_spec.rb b/spec/address_spec.rb
index e7b81f03..c27912d4 100644
--- a/spec/address_spec.rb
+++ b/spec/address_spec.rb
@@ -31,8 +31,7 @@
 
       # Delivery verification assertions
       expect(address.verifications.delivery.success).to be false
-      # TODO: details is not deserializing correctly, related to the larger "double EasyPostObject" wrapping issue
-      # expect(address.verifications.delivery.details).to be_empty
+      expect(address.verifications.delivery.details.to_hash).to be_empty
       expect(address.verifications.delivery.errors[0].code).to eq('E.ADDRESS.NOT_FOUND')
       expect(address.verifications.delivery.errors[0].field).to eq('address')
       expect(address.verifications.delivery.errors[0].suggestion).to be nil