diff --git a/.travis.yml b/.travis.yml
index 1ab55760..53ec0048 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,9 @@ rvm:
   - 2.2.6
   - 2.3.3
   - 2.4.1
+  - 2.5.1
+  - 2.6.0
+  - ruby-head
 env:
   global:
     - CODECLIMATE_REPO_TOKEN=396d4263adb6febf1e6e9b0c0e176fbde35e1a116a3c1ecf8dd4f9384e41979b
@@ -12,6 +15,7 @@ gemfile:
   - gemfiles/4.1.gemfile
   - gemfiles/4.2.gemfile
   - gemfiles/5.0.gemfile
+  - gemfiles/5.2.3.gemfile
 matrix:
   fast_finish: true
   exclude:
@@ -23,6 +27,26 @@ matrix:
       gemfile: gemfiles/4.1.gemfile
     - rvm: 2.4.1
       gemfile: gemfiles/4.2.gemfile
+    - rvm: 2.5.1
+      gemfile: gemfiles/3.2.gemfile
+    - rvm: 2.5.1
+      gemfile: gemfiles/4.0.gemfile
+    - rvm: 2.5.1
+      gemfile: gemfiles/4.1.gemfile
+    - rvm: 2.5.1
+      gemfile: gemfiles/4.2.gemfile
+    - rvm: 2.6.0
+      gemfile: gemfiles/4.0.gemfile
+    - rvm: 2.6.0
+      gemfile: gemfiles/4.1.gemfile
+    - rvm: 2.6.0
+      gemfile: gemfiles/4.2.gemfile
+    - rvm: ruby-head
+      gemfile: gemfiles/4.0.gemfile
+    - rvm: ruby-head
+      gemfile: gemfiles/4.1.gemfile
+    - rvm: ruby-head
+      gemfile: gemfiles/4.2.gemfile
 # We need to install latest version of bundler, because one in travis
 # image is too old to recognize platform => :mri_22 in Gemfile.
 before_install:
diff --git a/gemfiles/5.2.3.gemfile b/gemfiles/5.2.3.gemfile
new file mode 100644
index 00000000..9a9fda0a
--- /dev/null
+++ b/gemfiles/5.2.3.gemfile
@@ -0,0 +1,15 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rake"
+gem "appraisal"
+gem "activesupport", "~> 5.2.3"
+gem "addressable", "~> 2.2"
+gem "codeclimate-test-reporter", :group => :test, :require => nil
+
+group :development, :test do
+  gem "byebug", :platforms => [:mri_20, :mri_21, :mri_22]
+end
+
+gemspec :path => "../"