diff --git a/.travis.yml b/.travis.yml
index 4d0e219..abff30f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,25 +19,14 @@ install:
 
 rvm:
   - jruby
-  - 1.9.3
-  - 2.0.0
-  - 2.1
-  - 2.2
-  - 2.3.1
+  - 2.2.5
+  - 2.3.3
+  - 2.4.0
   - rbx
 
 matrix:
   allow_failures:
     - rvm: rbx
-      os: osx
-  exclude:
-    # Binaries for these rubies aren't available on OS X :<
-    - rvm: 2.2
-      os: osx
-    - rvm: 2.3.1
-      os: osx
-    - rvm: jruby
-      os: osx
   fast_finish: true
 
 notifications:
diff --git a/Gemfile b/Gemfile
index 97b9b70..e87d96b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,10 +2,6 @@ source 'https://rubygems.org'
 
 gemspec
 
-platforms :mingw_19, :ruby_19 do
-  gem 'json', '~> 2.0'
-end
-
 group :benchmarking do
   gem 'ox', :platforms => [:mri, :rbx]
   gem 'nokogiri'
diff --git a/appveyor.yml b/appveyor.yml
index 485a881..68e80b8 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,8 +10,8 @@ install:
   - SET PATH=C:\ragel;%PATH%
   - ruby --version
   - gem --version
-  - appveyor DownloadFile https://rubygems.org/downloads/bundler-1.9.0.gem -FileName bundler-1.9.0.gem
-  - gem install bundler-1.9.0.gem --local --quiet --no-ri --no-rdoc
+  - appveyor DownloadFile https://rubygems.org/downloads/bundler-1.13.7.gem -FileName bundler-1.13.7.gem
+  - gem install bundler-1.13.7.gem --local --quiet --no-ri --no-rdoc
   - bundle install --retry 3
 
 build: off
@@ -21,12 +21,12 @@ test_script:
 
 environment:
   matrix:
-    - ruby_version: "193"
-    - ruby_version: "200"
-    - ruby_version: "21"
-    - ruby_version: "21-x64"
     - ruby_version: "22"
     - ruby_version: "22-x64"
+    - ruby_version: "23"
+    - ruby_version: "23-x64"
+    - ruby_version: "24"
+    - ruby_version: "24-x64"
 
 skip_tags: true