diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1dd397d..1bda9f2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,8 +10,8 @@ jobs:
     - name: Setup Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 3.0.3
-    - uses: actions/cache@v2
+        ruby-version: 3.4.3
+    - uses: actions/cache@v4
       with:
         path: vendor/bundle
         key: gems-${{ hashFiles('**/Gemfile.lock') }}
diff --git a/.ruby-version b/.ruby-version
index 75a22a2..6cb9d3d 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.0.3
+3.4.3
diff --git a/README.md b/README.md
index 80d00bf..5b43a6c 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Rails application with ViewComponent, using the `https://github.com/github/view_
 
 ## Ruby version
 
-Use your favorite Ruby version manager to install `3.0.0`.
+Use your favorite Ruby version manager to install `3.4.3`.
 
 ## Local development