diff --git a/.ruby-version b/.ruby-version
index 57cf282e..2c9b4ef4 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.6.5
+2.7.3
diff --git a/Dockerfile b/Dockerfile
index dd1302df..281f1ef8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.6.5
+FROM ruby:2.7.3
 
 ENV LANG=C.UTF-8
 ENV ENABLE_SERVICE_WORKER=true
diff --git a/Gemfile b/Gemfile
index 632399fd..fa6189fd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
-ruby '~> 2.6.0'
+ruby '~> 2.7.3'
 
 gem 'rake'
 gem 'thor'
diff --git a/Gemfile.lock b/Gemfile.lock
index b32b4a9d..a65e166b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -170,7 +170,7 @@ DEPENDENCIES
   yajl-ruby
 
 RUBY VERSION
-   ruby 2.6.3p62
+   ruby 2.7.3p183
 
 BUNDLED WITH
-   2.0.2
+   2.1.4