diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8bbc1e9..d6b0703 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,3 +1,4 @@
+---
 name: ci
 
 jobs:
@@ -9,9 +10,9 @@ jobs:
       fail-fast: false
       matrix:
         ruby:
-          - '3.3'
+          - '3.4'
         include:
-          - ruby: '3.3'
+          - ruby: '3.4'
             coverage: 'true'
 
     steps:
@@ -38,7 +39,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.3
+          ruby-version: 3.4
       - name: Install latest bundler
         run: gem install bundler --no-document
       - name: Install Diffend plugin
diff --git a/.ruby-version b/.ruby-version
index fa7adc7..4f5e697 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.5
+3.4.5
diff --git a/Gemfile.lock b/Gemfile.lock
index 991b6fa..93f4817 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -104,4 +104,4 @@ DEPENDENCIES
   support_engine!
 
 BUNDLED WITH
-   2.6.3
+   2.7.1