diff --git a/.ruby-version b/.ruby-version
index be94e6f..15a2799 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.2.2
+3.3.0
diff --git a/Dockerfile b/Dockerfile
index cfaecd8..9ee9e4b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.2.2-alpine
+FROM ruby:3.3.0-alpine
 
 # for postgres: postgresql-dev
 RUN apk add --no-cache \
diff --git a/Gemfile b/Gemfile
index f18f8b7..85902ec 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,8 +3,6 @@
 source "https://rubygems.org"
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby "3.2.2"
-
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem "rails", "~> 6.1"
 # Use sqlite3 as the database for Active Record
diff --git a/Gemfile.lock b/Gemfile.lock
index fe4b958..d85443f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -362,8 +362,5 @@ DEPENDENCIES
   yabeda-rails
   yard
 
-RUBY VERSION
-   ruby 3.2.2p53
-
 BUNDLED WITH
    2.3.26