diff --git a/Gemfile b/Gemfile
index 59dba388c..47b3fdf16 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,6 @@ source 'https://rubygems.org'
 gemspec name: 'inspec'
 
 gem 'ffi', '>= 1.9.14'
-gem 'aws-sdk', '~> 2'
 
 group :test do
   gem 'minitest', '~> 5.5'
diff --git a/inspec-core.gemspec b/inspec-core.gemspec
index 3dbbe1b43..589e411b9 100644
--- a/inspec-core.gemspec
+++ b/inspec-core.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 2.3'
 
-  spec.add_dependency 'train-core', '~> 1.5', '>= 1.7.2'
+  spec.add_dependency 'train-core', '~> 2.0'
   spec.add_dependency 'thor', '~> 0.20'
   spec.add_dependency 'json', '>= 1.8', '< 3.0'
   spec.add_dependency 'method_source', '~> 0.8'
diff --git a/inspec.gemspec b/inspec.gemspec
index 15a83abbd..5564405d2 100644
--- a/inspec.gemspec
+++ b/inspec.gemspec
@@ -24,7 +24,8 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 2.3'
 
-  spec.add_dependency 'train', '~> 1.5', '>= 1.7.2'
+  spec.add_dependency 'train', '~> 2.0' # Inspec 4 must have train 2+
+  spec.add_dependency 'train-aws', '~> 0.1'
   spec.add_dependency 'thor', '~> 0.20'
   spec.add_dependency 'json', '>= 1.8', '< 3.0'
   spec.add_dependency 'method_source', '~> 0.8'