diff --git a/.travis.yml b/.travis.yml
index 8ab05b1..d21c07b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,29 +8,10 @@ rvm:
   - 2.7.0
 
 gemfile:
+  - gemfiles/rails_5.2.gemfile
+  - gemfiles/rails_5.1.gemfile
   - gemfiles/rails_5.0.gemfile
-  - gemfiles/rails_4.2.gemfile
-  - gemfiles/rails_4.1.gemfile
-
-matrix:
-  exclude:
-    - rvm: 2.4.8
-      gemfile: gemfiles/rails_4.1.gemfile
-    - rvm: 2.4.8
-      gemfile: gemfiles/rails_4.2.gemfile
-    - rvm: 2.5.7
-      gemfile: gemfiles/rails_4.1.gemfile
-    - rvm: 2.5.7
-      gemfile: gemfiles/rails_4.2.gemfile
-    - rvm: 2.6.5
-      gemfile: gemfiles/rails_4.1.gemfile
-    - rvm: 2.6.5
-      gemfile: gemfiles/rails_4.2.gemfile
-    - rvm: 2.7.0
-      gemfile: gemfiles/rails_4.1.gemfile
-    - rvm: 2.7.0
-      gemfile: gemfiles/rails_4.2.gemfile
 
 before_install:
-  - if ruby --version | cut -d ' ' -f 2 | grep -q 2.1.5p273 ; then gem update --system 2.4.8; fi
-  - gem install bundler
\ No newline at end of file
+  - yes | gem update --system --force
+  - gem install bundler
diff --git a/Appraisals b/Appraisals
index f13f76a..9be9de4 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,11 +1,11 @@
-appraise "rails-4.1" do
-  gem "activesupport", "~> 4.1.0"
+appraise "rails-5.0" do
+  gem "activesupport", "~> 5.0.0"
 end
 
-appraise "rails-4.2" do
-  gem "activesupport", "~> 4.2.0"
+appraise "rails-5.1" do
+  gem "activesupport", "~> 5.1.0"
 end
 
-appraise "rails-5.0" do
-  gem "activesupport", "~> 5.0.0"
+appraise "rails-5.2" do
+  gem "activesupport", "~> 5.2.0"
 end
diff --git a/gemfiles/rails_4.1.gemfile.lock b/gemfiles/rails_4.1.gemfile.lock
deleted file mode 100644
index 95dd856..0000000
--- a/gemfiles/rails_4.1.gemfile.lock
+++ /dev/null
@@ -1,78 +0,0 @@
-PATH
-  remote: ..
-  specs:
-    qbxml (0.4.0)
-      activesupport (>= 4.1.0)
-      builder (~> 3.0)
-      nokogiri (~> 1.5)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activesupport (4.1.16)
-      i18n (~> 0.6, >= 0.6.9)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.1)
-      tzinfo (~> 1.1)
-    appraisal (2.1.0)
-      bundler
-      rake
-      thor (>= 0.14.0)
-    builder (3.2.3)
-    coderay (1.1.1)
-    diff-lcs (1.2.5)
-    docile (1.1.5)
-    i18n (0.7.0)
-    json (1.8.3)
-    method_source (0.8.2)
-    mini_portile2 (2.1.0)
-    minitest (5.9.0)
-    nokogiri (1.7.2)
-      mini_portile2 (~> 2.1.0)
-    pry (0.10.4)
-      coderay (~> 1.1.0)
-      method_source (~> 0.8.1)
-      slop (~> 3.4)
-    pry-nav (0.2.4)
-      pry (>= 0.9.10, < 0.11.0)
-    rake (11.2.2)
-    rspec (3.5.0)
-      rspec-core (~> 3.5.0)
-      rspec-expectations (~> 3.5.0)
-      rspec-mocks (~> 3.5.0)
-    rspec-core (3.5.2)
-      rspec-support (~> 3.5.0)
-    rspec-expectations (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-mocks (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-support (3.5.0)
-    simplecov (0.12.0)
-      docile (~> 1.1.0)
-      json (>= 1.8, < 3)
-      simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.0)
-    slop (3.6.0)
-    thor (0.19.1)
-    thread_safe (0.3.5)
-    tzinfo (1.2.2)
-      thread_safe (~> 0.1)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activesupport (~> 4.1.0)
-  appraisal
-  pry
-  pry-nav
-  qbxml!
-  rake
-  rspec
-  simplecov
-
-BUNDLED WITH
-   1.15.0
diff --git a/gemfiles/rails_4.2.gemfile.lock b/gemfiles/rails_4.2.gemfile.lock
deleted file mode 100644
index 3c12b91..0000000
--- a/gemfiles/rails_4.2.gemfile.lock
+++ /dev/null
@@ -1,78 +0,0 @@
-PATH
-  remote: ..
-  specs:
-    qbxml (0.4.0)
-      activesupport (>= 4.1.0)
-      builder (~> 3.0)
-      nokogiri (~> 1.5)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activesupport (4.2.7.1)
-      i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
-    appraisal (2.1.0)
-      bundler
-      rake
-      thor (>= 0.14.0)
-    builder (3.2.3)
-    coderay (1.1.1)
-    diff-lcs (1.2.5)
-    docile (1.1.5)
-    i18n (0.7.0)
-    json (1.8.3)
-    method_source (0.8.2)
-    mini_portile2 (2.1.0)
-    minitest (5.9.0)
-    nokogiri (1.7.2)
-      mini_portile2 (~> 2.1.0)
-    pry (0.10.4)
-      coderay (~> 1.1.0)
-      method_source (~> 0.8.1)
-      slop (~> 3.4)
-    pry-nav (0.2.4)
-      pry (>= 0.9.10, < 0.11.0)
-    rake (11.2.2)
-    rspec (3.5.0)
-      rspec-core (~> 3.5.0)
-      rspec-expectations (~> 3.5.0)
-      rspec-mocks (~> 3.5.0)
-    rspec-core (3.5.2)
-      rspec-support (~> 3.5.0)
-    rspec-expectations (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-mocks (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-support (3.5.0)
-    simplecov (0.12.0)
-      docile (~> 1.1.0)
-      json (>= 1.8, < 3)
-      simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.0)
-    slop (3.6.0)
-    thor (0.19.1)
-    thread_safe (0.3.5)
-    tzinfo (1.2.2)
-      thread_safe (~> 0.1)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activesupport (~> 4.2.0)
-  appraisal
-  pry
-  pry-nav
-  qbxml!
-  rake
-  rspec
-  simplecov
-
-BUNDLED WITH
-   1.15.0
diff --git a/gemfiles/rails_5.0.gemfile.lock b/gemfiles/rails_5.0.gemfile.lock
index 9a4caa8..08fe5b2 100644
--- a/gemfiles/rails_5.0.gemfile.lock
+++ b/gemfiles/rails_5.0.gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: ..
   specs:
     qbxml (0.4.0)
-      activesupport (>= 4.1.0)
+      activesupport (>= 5.0.0)
       builder (~> 3.0)
       nokogiri (~> 1.5)
 
diff --git a/gemfiles/rails_4.1.gemfile b/gemfiles/rails_5.1.gemfile
similarity index 74%
rename from gemfiles/rails_4.1.gemfile
rename to gemfiles/rails_5.1.gemfile
index a9d4118..a218404 100644
--- a/gemfiles/rails_4.1.gemfile
+++ b/gemfiles/rails_5.1.gemfile
@@ -2,6 +2,6 @@
 
 source "https://rubygems.org"
 
-gem "activesupport", "~> 4.1.0"
+gem "activesupport", "~> 5.1.0"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_5.1.gemfile.lock b/gemfiles/rails_5.1.gemfile.lock
new file mode 100644
index 0000000..d22711a
--- /dev/null
+++ b/gemfiles/rails_5.1.gemfile.lock
@@ -0,0 +1,77 @@
+PATH
+  remote: ..
+  specs:
+    qbxml (0.4.0)
+      activesupport (>= 5.0.0)
+      builder (~> 3.0)
+      nokogiri (~> 1.5)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (5.1.7)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    appraisal (2.2.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    builder (3.2.4)
+    coderay (1.1.2)
+    concurrent-ruby (1.1.5)
+    diff-lcs (1.3)
+    docile (1.3.2)
+    i18n (1.7.1)
+      concurrent-ruby (~> 1.0)
+    json (2.3.0)
+    method_source (0.9.2)
+    mini_portile2 (2.4.0)
+    minitest (5.13.0)
+    nokogiri (1.10.7)
+      mini_portile2 (~> 2.4.0)
+    pry (0.12.2)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
+    pry-nav (0.3.0)
+      pry (>= 0.9.10, < 0.13.0)
+    rake (13.0.1)
+    rspec (3.9.0)
+      rspec-core (~> 3.9.0)
+      rspec-expectations (~> 3.9.0)
+      rspec-mocks (~> 3.9.0)
+    rspec-core (3.9.1)
+      rspec-support (~> 3.9.1)
+    rspec-expectations (3.9.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.9.0)
+    rspec-mocks (3.9.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.9.0)
+    rspec-support (3.9.2)
+    simplecov (0.17.1)
+      docile (~> 1.1)
+      json (>= 1.8, < 3)
+      simplecov-html (~> 0.10.0)
+    simplecov-html (0.10.2)
+    thor (1.0.1)
+    thread_safe (0.3.6)
+    tzinfo (1.2.6)
+      thread_safe (~> 0.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activesupport (~> 5.1.0)
+  appraisal
+  pry
+  pry-nav
+  qbxml!
+  rake
+  rspec
+  simplecov
+
+BUNDLED WITH
+   2.1.2
diff --git a/gemfiles/rails_4.2.gemfile b/gemfiles/rails_5.2.gemfile
similarity index 74%
rename from gemfiles/rails_4.2.gemfile
rename to gemfiles/rails_5.2.gemfile
index 44907a7..61c3cca 100644
--- a/gemfiles/rails_4.2.gemfile
+++ b/gemfiles/rails_5.2.gemfile
@@ -2,6 +2,6 @@
 
 source "https://rubygems.org"
 
-gem "activesupport", "~> 4.2.0"
+gem "activesupport", "~> 5.2.0"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_5.2.gemfile.lock b/gemfiles/rails_5.2.gemfile.lock
new file mode 100644
index 0000000..3b95fd6
--- /dev/null
+++ b/gemfiles/rails_5.2.gemfile.lock
@@ -0,0 +1,77 @@
+PATH
+  remote: ..
+  specs:
+    qbxml (0.4.0)
+      activesupport (>= 5.0.0)
+      builder (~> 3.0)
+      nokogiri (~> 1.5)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (5.2.4.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    appraisal (2.2.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    builder (3.2.4)
+    coderay (1.1.2)
+    concurrent-ruby (1.1.5)
+    diff-lcs (1.3)
+    docile (1.3.2)
+    i18n (1.7.1)
+      concurrent-ruby (~> 1.0)
+    json (2.3.0)
+    method_source (0.9.2)
+    mini_portile2 (2.4.0)
+    minitest (5.13.0)
+    nokogiri (1.10.7)
+      mini_portile2 (~> 2.4.0)
+    pry (0.12.2)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
+    pry-nav (0.3.0)
+      pry (>= 0.9.10, < 0.13.0)
+    rake (13.0.1)
+    rspec (3.9.0)
+      rspec-core (~> 3.9.0)
+      rspec-expectations (~> 3.9.0)
+      rspec-mocks (~> 3.9.0)
+    rspec-core (3.9.1)
+      rspec-support (~> 3.9.1)
+    rspec-expectations (3.9.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.9.0)
+    rspec-mocks (3.9.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.9.0)
+    rspec-support (3.9.2)
+    simplecov (0.17.1)
+      docile (~> 1.1)
+      json (>= 1.8, < 3)
+      simplecov-html (~> 0.10.0)
+    simplecov-html (0.10.2)
+    thor (1.0.1)
+    thread_safe (0.3.6)
+    tzinfo (1.2.6)
+      thread_safe (~> 0.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activesupport (~> 5.2.0)
+  appraisal
+  pry
+  pry-nav
+  qbxml!
+  rake
+  rspec
+  simplecov
+
+BUNDLED WITH
+   2.1.2
diff --git a/qbxml.gemspec b/qbxml.gemspec
index 57b6d08..17e9d54 100644
--- a/qbxml.gemspec
+++ b/qbxml.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |gem|
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]
 
-  gem.add_dependency('activesupport', '>= 4.1.0')
+  gem.add_dependency('activesupport', '>= 5.0.0')
   gem.add_dependency('nokogiri', '~> 1.5')
   gem.add_dependency('builder', '~> 3.0')