diff --git a/.travis.yml b/.travis.yml
index eeb3709d2..e0e6a5a59 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: ruby
 rvm:
-- 2.4.1
+- 2.5.5
 before_script: bundle exec rake hatchet:setup_travis
 script: bundle exec parallel_rspec -n 11 spec/
 after_script:
diff --git a/Gemfile.lock b/Gemfile.lock
index fd2c367e8..57f2030cf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,5 @@
 GIT
-  remote: git://github.com/hone/ruby-git.git
+  remote: https://github.com/hone/ruby-git.git
   revision: 264836fcff3c037d8d8fc44bd770b150b46fdc4e
   branch: master
   specs:
@@ -8,77 +8,62 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.8)
-      i18n (~> 0.7)
+    activesupport (6.0.0)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    anvil-cli (0.16.2)
-      progress (~> 2.4, >= 2.4.0)
-      rest-client (~> 1.6, >= 1.6.7)
-      thor (~> 0.15, >= 0.15.2)
+      zeitwerk (~> 2.1, >= 2.1.8)
+    concurrent-ruby (1.1.5)
     diff-lcs (1.3)
-    domain_name (0.5.20170404)
-      unf (>= 0.0.5, < 1.0.0)
     erubis (2.7.0)
-    excon (0.57.0)
-    heroics (0.0.22)
+    excon (0.67.0)
+    heroics (0.0.25)
       erubis (~> 2.0)
       excon
+      moneta
       multi_json (>= 1.9.2)
-    heroku-api (0.4.2)
-      excon (~> 0.45)
-      multi_json (~> 1.8)
-    heroku_hatchet (3.0.1)
-      activesupport (~> 4)
-      anvil-cli (~> 0)
+    heroku_hatchet (3.0.6)
       excon (~> 0)
-      heroku-api (~> 0)
+      minitest-retry (~> 0.1.9)
       platform-api (~> 2)
       repl_runner (~> 0.0.3)
       rrrretry (~> 1)
       thor (~> 0)
       threaded (~> 0)
-    http-cookie (1.0.3)
-      domain_name (~> 0.5)
-    i18n (0.8.4)
+    i18n (1.7.0)
+      concurrent-ruby (~> 1.0)
     json (2.0.4)
-    mime-types (2.99.3)
-    minitest (5.10.2)
-    moneta (0.8.1)
-    multi_json (1.12.1)
+    minitest (5.12.2)
+    minitest-retry (0.1.9)
+      minitest (>= 5.0)
+    moneta (1.0.0)
+    multi_json (1.14.1)
     netrc (0.11.0)
-    parallel (1.11.2)
-    parallel_tests (2.14.1)
+    parallel (1.18.0)
+    parallel_tests (2.29.2)
       parallel
-    platform-api (2.0.0)
-      heroics (~> 0.0.22)
-      moneta (~> 0.8.1)
-    progress (2.4.0)
-    rake (12.0.0)
+    platform-api (2.2.0)
+      heroics (~> 0.0.25)
+      moneta (~> 1.0.0)
+    rake (13.0.0)
     repl_runner (0.0.3)
       activesupport
-    rest-client (1.8.0)
-      http-cookie (>= 1.0.2, < 2.0)
-      mime-types (>= 1.16, < 3.0)
-      netrc (~> 0.7)
     rrrretry (1.0.0)
-    rspec-core (3.6.0)
-      rspec-support (~> 3.6.0)
-    rspec-expectations (3.6.0)
+    rspec-core (3.9.0)
+      rspec-support (~> 3.9.0)
+    rspec-expectations (3.9.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.6.0)
-    rspec-retry (0.5.4)
-      rspec-core (> 3.3, < 3.7)
-    rspec-support (3.6.0)
-    thor (0.19.4)
+      rspec-support (~> 3.9.0)
+    rspec-retry (0.6.1)
+      rspec-core (> 3.3)
+    rspec-support (3.9.0)
+    thor (0.20.3)
     thread_safe (0.3.6)
     threaded (0.0.4)
-    tzinfo (1.2.3)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    unf (0.1.4)
-      unf_ext
-    unf_ext (0.0.7.4)
+    zeitwerk (2.2.0)
 
 PLATFORMS
   ruby
@@ -96,4 +81,4 @@ DEPENDENCIES
   rspec-retry
 
 BUNDLED WITH
-   1.15.1
+   2.1.4
diff --git a/lib/language_pack/helpers/bundler_wrapper.rb b/lib/language_pack/helpers/bundler_wrapper.rb
index ab0baaee9..af0e8dc99 100644
--- a/lib/language_pack/helpers/bundler_wrapper.rb
+++ b/lib/language_pack/helpers/bundler_wrapper.rb
@@ -102,6 +102,8 @@ def ruby_version
       if output.match(/No ruby version specified/)
         ""
       else
+        # ignore possible warning output from bundler
+        output = output.lines.select { |line| /\A\w+ \d+\.\d+\.\d+/.match(line) }.join
         output.chomp.sub('(', '').sub(')', '').sub(/(p-?\d+)/, ' \1').split.join('-')
       end
     end
diff --git a/lib/language_pack/ruby.rb b/lib/language_pack/ruby.rb
index 114d8a59f..e71724f6b 100644
--- a/lib/language_pack/ruby.rb
+++ b/lib/language_pack/ruby.rb
@@ -16,7 +16,7 @@ class LanguagePack::Ruby < LanguagePack::Base
   NAME                 = "ruby"
   LIBYAML_VERSION      = "0.1.7"
   LIBYAML_PATH         = "libyaml-#{LIBYAML_VERSION}"
-  BUNDLER_VERSION      = "1.15.1"
+  BUNDLER_VERSION      = "2.1.4"
   BUNDLER_GEM_PATH     = "bundler-#{BUNDLER_VERSION}"
   RBX_BASE_URL         = "http://binaries.rubini.us/heroku"
   NODE_BP_PATH         = "vendor/node/bin"
diff --git a/lib/language_pack/ruby_version.rb b/lib/language_pack/ruby_version.rb
index e34f9779a..fe9f8ba7b 100644
--- a/lib/language_pack/ruby_version.rb
+++ b/lib/language_pack/ruby_version.rb
@@ -12,7 +12,7 @@ def initialize(output = "")
       end
     end
 
-    DEFAULT_VERSION_NUMBER = "2.4.1"
+    DEFAULT_VERSION_NUMBER = "2.5.5"
     DEFAULT_VERSION        = "ruby-#{DEFAULT_VERSION_NUMBER}"
     LEGACY_VERSION_NUMBER  = "1.9.2"
     LEGACY_VERSION         = "ruby-#{LEGACY_VERSION_NUMBER}"