diff --git a/.ruby-version b/.ruby-version
index 2aa5131992..4d54daddb6 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.7
+4.0.2
diff --git a/.tool-versions b/.tool-versions
index 3f03c7a73d..0f1e605ab8 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1 +1 @@
-ruby 3.4.7
+ruby 4.0.2
diff --git a/Gemfile b/Gemfile
index 5c716841b1..54262a2e06 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-ruby '~> 3.4.7'
+ruby '~> 4.0.2'
 
 source 'https://rubygems.org'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 4fb6934e82..deb752adcb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -71,11 +71,14 @@ GEM
     ice_nine (0.11.2)
     logger (1.7.0)
     mini_portile2 (2.8.9)
-    minitest (5.25.5)
+    minitest (6.0.2)
+      drb (~> 2.0)
+      prism (~> 1.5)
     nokogiri (1.18.9)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     ostruct (0.6.3)
+    prism (1.9.0)
     racc (1.8.1)
     rake (12.3.3)
     rexml (3.4.2)
@@ -128,7 +131,7 @@ DEPENDENCIES
   rubel!
 
 RUBY VERSION
-   ruby 3.4.7p58
+   ruby 4.0.2p0
 
 BUNDLED WITH
-   2.6.9
+   4.0.6