diff --git a/Gemfile b/Gemfile
index 7fc2dda..d0c4960 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '2.6.6'
+ruby '2.7.5'
 
 # core
 gem 'puma'
diff --git a/Gemfile.lock b/Gemfile.lock
index b305b16..df759b4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -434,7 +434,7 @@ DEPENDENCIES
   xmlrpc
 
 RUBY VERSION
-   ruby 2.6.6p146
+   ruby 2.7.5p203
 
 BUNDLED WITH
    1.17.3