diff --git a/.ruby-version b/.ruby-version
index c063f5a..c9b8707 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-ruby-2.2.4
+ruby-2.4.4
diff --git a/.travis.yml b/.travis.yml
index 4164274..ded5969 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: ruby
 rvm:
-  - 2.2
-  - 2.3
   - 2.4
   - 2.5
+  - 2.6
+  - 2.7
   - ruby-head
 script: bundle exec rake
diff --git a/Gemfile.lock b/Gemfile.lock
index 6d3034b..760d5bf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -125,4 +125,4 @@ DEPENDENCIES
   sqlite3
 
 BUNDLED WITH
-   1.14.6
+   2.1.4