diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index da2994f..d2524b1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,7 +15,7 @@ jobs:
 
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.0.3"
+          ruby-version: .ruby-version
           bundler-cache: true
 
       - name: Wait for MySQL to boot
diff --git a/.ruby-version b/.ruby-version
index 15a2799..fa7adc7 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.0
+3.3.5
diff --git a/Dockerfile b/Dockerfile
index c2b9dc8..3fbcc56 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.3.0-alpine3.18
+FROM ruby:3.3.5-alpine3.18
 ARG KRANE_VERSION=3.0.1
 ARG KUBECTL_VERSION=1.26.3
 
diff --git a/Gemfile b/Gemfile
index 14dcded..5c72e3e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,7 @@
 source 'https://rubygems.org'
 
+ruby file: ".ruby-version"
+
 gem 'rails', '~> 7.0.8'
 gem 'mysql2'
 gem 'puma', '~> 6.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index b7cdd37..9aa66f9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -363,5 +363,8 @@ DEPENDENCIES
   sidekiq
   web-console (>= 3.3.0)
 
+RUBY VERSION
+   ruby 3.3.5p100
+
 BUNDLED WITH
-   2.5.5
+   2.5.21