diff --git a/.ruby-version b/.ruby-version
index 619b537..4d9d11c 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.3
+3.4.2
diff --git a/logto-sample/Gemfile b/logto-sample/Gemfile
index 90fbdfc..229cf24 100644
--- a/logto-sample/Gemfile
+++ b/logto-sample/Gemfile
@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
-ruby "3.3.3"
+ruby "3.4.2"
 
 # Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
 gem "rails", "~> 7.2.0", ">= 7.2.1"
diff --git a/logto-sample/Gemfile.lock b/logto-sample/Gemfile.lock
index e57d94d..ff58a11 100644
--- a/logto-sample/Gemfile.lock
+++ b/logto-sample/Gemfile.lock
@@ -277,7 +277,7 @@ DEPENDENCIES
   web-console
 
 RUBY VERSION
-   ruby 3.3.3p89
+   ruby 3.4.2p28
 
 BUNDLED WITH
    2.5.11