Bundled ruby throws error on net/http usage with vault gem

OS: Ubuntu 16.04 LTS 64 Bit

Puppet Source: apt.puppetlabs.com (PC1)

*** LOCAL GEMS ***

deep_merge (1.1.1)

fast_gettext (1.1.0)

gettext (3.2.2)

gettext-setup (0.26)

hocon (1.1.3)

jar-dependencies (0.2.6)

jruby-openssl (0.9.16 java)

json (1.8.0 java)

locale (2.1.2)

puppet-strings (1.1.0)

rake (10.1.0)

rdoc (4.1.2)

rgen (0.8.2)

semantic_puppet (0.1.3)

text (1.3.1)

vault (0.10.1)

yard (0.9.9)

2017-10-04 15:56:40,932 ERROR [qtp266666617-77] [puppetserver] Puppet Server Error: Evaluation Error: Error while evaluating a Function Call, undefined method `keep_alive_timeout=' for #<Net::HTTP xxx.xxx:9999 open=true> at /etc/puppetlabs/code/environments/development/manifests/site.pp:2:1 on node xxx

  require 'net/http'

  require 'json'

  require 'vault'

  vault = Vault::Client.new

  vault.configure do |config|

    config.address = "https://xxx.xxx:9999"

    config.token = "xxx"

    config.ssl_verify = false

    config.ssl_ciphers = "DEFAULT"

    config.timeout = 30

    config.ssl_timeout  = 5

    config.open_timeout = 5

    config.read_timeout = 30

  end