diff --git a/Gemfile b/Gemfile
index 64b47a4..cc172bf 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,9 @@ group :development do
   # We depend on Vagrant for development, but we don't add it as a
   # gem dependency because we expect to be installed within the
   # Vagrant environment itself using `vagrant plugin`.
-  gem 'vagrant', git: 'https://github.com/hashicorp/vagrant.git', branch: 'main'
+  gem 'vagrant', git: 'https://github.com/hashicorp/vagrant.git', tag: 'v2.3.4'
 
-  gem 'vagrant-spec', git: 'https://github.com/hashicorp/vagrant-spec.git', branch: 'main'
+  # TODO: Switch back to the upstream from `hashicorp` org when this PR is merged:
+  # https://github.com/hashicorp/vagrant-spec/pull/56
+  gem 'vagrant-spec', git: 'https://github.com/legal90/vagrant-spec.git', branch: 'fix-ruby-3'
 end
diff --git a/vagrant-parallels.gemspec b/vagrant-parallels.gemspec
index ed9db25..6e14ae3 100644
--- a/vagrant-parallels.gemspec
+++ b/vagrant-parallels.gemspec
@@ -13,7 +13,6 @@ Gem::Specification.new do |spec|
   spec.homepage      = 'https://github.com/Parallels/vagrant-parallels'
   spec.license       = 'MIT'
 
-  spec.required_ruby_version     = '>= 3.0', '< 3.3'
   spec.required_rubygems_version = '>= 1.3.6'
   spec.rubyforge_project         = 'vagrant-parallels'
 
@@ -24,6 +23,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rspec', '~> 3.11'
   spec.add_development_dependency 'rspec-its', '~> 1.3.0'
+  spec.add_development_dependency 'webrick', '~> 1.8.0'
 
   spec.files = Dir['lib/**/*', 'locales/**/*', 'README.md', 'CHANGELOG.md', 'LICENSE.txt']
   spec.require_path = 'lib'