diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b34386b..1964767 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,7 @@
-name: build
+name: test
 
-on: [pull_request]
+on:
+  pull_request:
 
 jobs:
   test:
@@ -13,9 +14,6 @@ jobs:
           - '3.3'
           - '3.2'
           - '3.1'
-          - '3.0'
-          - '2.7'
-          - '2.6'
     steps:
     - uses: actions/checkout@v3
     - uses: ruby/setup-ruby@v1
diff --git a/.ruby-version b/.ruby-version
index a603bb5..47b322c 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.7.5
+3.4.1
diff --git a/Gemfile.lock b/Gemfile.lock
index 2c52a42..679f025 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,10 +5,11 @@ GEM
     maxitest (5.8.0)
       minitest (>= 5.14.0, < 5.26.0)
     minitest (5.25.4)
-    rake (13.0.6)
+    rake (13.2.1)
 
 PLATFORMS
   arm64-darwin-21
+  arm64-darwin-23
   arm64-darwin-24
   x86_64-linux
 
@@ -18,4 +19,4 @@ DEPENDENCIES
   rake
 
 BUNDLED WITH
-   2.3.12
+   2.6.2
diff --git a/rchardet.gemspec b/rchardet.gemspec
index 80cdee4..df0d73c 100644
--- a/rchardet.gemspec
+++ b/rchardet.gemspec
@@ -7,5 +7,5 @@ Gem::Specification.new "rchardet", CharDet::VERSION do |s|
   s.summary    = "Character encoding auto-detection in Ruby. As smart as your browser. Open source."
   s.files      = Dir["lib/**/*", "LGPL-LICENSE.txt"]
   s.license    = "LGPL"
-  s.required_ruby_version = ">= 2.6.0"
+  s.required_ruby_version = ">= 3.0.0"
 end