diff --git a/aptible-cli.gemspec b/aptible-cli.gemspec
index e39ffeeb..454aa9fe 100644
--- a/aptible-cli.gemspec
+++ b/aptible-cli.gemspec
@@ -30,13 +30,14 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'chronic_duration', '~> 0.10.6'
   spec.add_dependency 'cbor'
   spec.add_dependency 'aws-sdk', '~> 2.0'
+  spec.add_dependency 'bigdecimal', '~> 1.3.5' # https://github.com/ruby/bigdecimal#which-version-should-you-select
 
   # Temporarily pin ffi until https://github.com/ffi/ffi/issues/868 is fixed
   spec.add_dependency 'ffi', '<= 1.14.1' if Gem.win_platform?
   spec.add_dependency 'win32-process' if Gem.win_platform?
 
   spec.add_dependency 'activesupport', '>= 4.0', '< 6.0'
-  spec.add_development_dependency 'bundler', '~> 1.3'
+  spec.add_development_dependency 'bundler', '~> 2.1'
   spec.add_development_dependency 'aptible-tasks', '~> 0.5.8'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rspec', '~> 3.2'