diff --git a/.gitattributes b/.gitattributes
index dc15ed793c..bb040f9a84 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -8,4 +8,3 @@
 # Same thing for following files, but they don't have an sh extension
 pre-commit eol=lf
 webpack-dev-server eol=lf
-install-bundler eol=lf
\ No newline at end of file
diff --git a/.ruby-version b/.ruby-version
index 5f6fc5edc2..7921bd0c89 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.10
+3.4.8
diff --git a/Dockerfile b/Dockerfile
index 2c7ed56f58..5af71e90e9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.3.10-alpine3.19 AS base
+FROM ruby:3.4.8-alpine3.19 AS base
 ENV LANG=C.UTF-8 \
     LC_ALL=C.UTF-8 \
     TZ=Europe/London \
diff --git a/Dockerfile.ubuntu b/Dockerfile.ubuntu
index 4d67450b24..5900b7156a 100644
--- a/Dockerfile.ubuntu
+++ b/Dockerfile.ubuntu
@@ -83,11 +83,8 @@ RUN wget https://chromedriver.storage.googleapis.com/2.41/chromedriver_linux64.z
 # Copy code and install app dependencies
 COPY . /usr/src/app/
 
-# Install Bundler
-RUN ./script/install-bundler
-
 # Install front-end dependencies
 RUN yarn install
 
 # Run bundler install in parallel with the amount of available CPUs
-RUN bundle install --jobs="$(nproc)"
\ No newline at end of file
+RUN bundle install --jobs="$(nproc)"
diff --git a/Gemfile.lock b/Gemfile.lock
index c81e0fd26f..e86a88289b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1114,7 +1114,7 @@ DEPENDENCIES
   wkhtmltopdf-binary
 
 RUBY VERSION
-   ruby 3.3.10p183
+  ruby 3.4.8p72
 
 BUNDLED WITH
-   2.5.22
+  4.0.3
diff --git a/app/models/spree/payment_method.rb b/app/models/spree/payment_method.rb
index b66d8d239b..50fbb69158 100644
--- a/app/models/spree/payment_method.rb
+++ b/app/models/spree/payment_method.rb
@@ -93,8 +93,8 @@ module Spree
       type.demodulize.downcase
     end
 
-    def self.find_with_destroyed(*args)
-      unscoped { find(*args) }
+    def self.find_with_destroyed(*)
+      unscoped { find(*) }
     end
 
     def payment_profiles_supported?
diff --git a/bin/setup b/bin/setup
index 52411f7240..1f75470d94 100755
--- a/bin/setup
+++ b/bin/setup
@@ -16,7 +16,7 @@ FileUtils.chdir APP_ROOT do
   # Add necessary setup steps to this file.
 
   puts "== Installing dependencies =="
-  system! "script/install-bundler"
+
   # Check first (it's quicker), then install new gems if necessary
   system("bundle check 2> /dev/null") || system!(BUNDLE_ENV, "bundle install")
 
diff --git a/lib/reporting/reports/enterprise_fee_summary/scope.rb b/lib/reporting/reports/enterprise_fee_summary/scope.rb
index 5aa518f5c4..f678a5750b 100644
--- a/lib/reporting/reports/enterprise_fee_summary/scope.rb
+++ b/lib/reporting/reports/enterprise_fee_summary/scope.rb
@@ -392,9 +392,9 @@ module Reporting
           end
         end
 
-        def filter_scope(*args)
+        def filter_scope(*)
           chain_to_scope do
-            where(*args)
+            where(*)
           end
         end
       end
diff --git a/script/bump-ruby.sh b/script/bump-ruby.sh
new file mode 100755
index 0000000000..337f23cb2a
--- /dev/null
+++ b/script/bump-ruby.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env sh
+
+if [ "$#" -lt 1 ]; then
+  echo "Usage:   $0 <new-version>"
+  echo "Example: $0 3.4.8"
+  exit 1
+fi
+
+set -ex
+
+OLD_VERSION=$(cat .ruby-version)
+NEW_VERSION=$1
+PATTERN="$(echo "$OLD_VERSION" | sed 's:[]\[^$.*/]:\\&:g')"
+
+sed -i "s/\<$PATTERN\>/$NEW_VERSION/" .ruby-version Dockerfile
+
+script/rbenv-install.sh
+
+# Update bundler to the version shipped with Ruby:
+bundle update --bundler
+
+git commit -a -m "Bump Ruby from $OLD_VERSION to $NEW_VERSION"
diff --git a/script/install-bundler b/script/install-bundler
deleted file mode 100755
index 1fb3e7d945..0000000000
--- a/script/install-bundler
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/bin/sh
-
-# This shell script looks for the last used Bundler version in Gemfile.lock and
-# installs exactly that version, removing all other versions.
-
-# Command line arguments are passed on to `gem install`. So you can call this
-# script with with arguments:
-#
-#   ./script/install-bundler --no-ri --no-rdoc
-
-# This script is used by ofn-install and can by handy in your development
-# environment.
-
-# Fail if a single command fails.
-set -e
-
-# `grep`:      find the occurrences of "BUNDLED WITH" (-m is unnecessary and behaves different on macOS)
-# `-A`:        print the next line after "BUNDLED WITH" as well
-# `-F`:        find exactly that string
-# `tail -n 1`: take the last line, the version line
-# `tr -d`:     delete all spaces, the indent before the version
-version="$(grep -A 1 -F "BUNDLED WITH" Gemfile.lock | tail -n 1  | tr -d '[:space:]')"
-
-# if the length of $version is zero
-if [ -z "$version" ]; then
-  echo >&2 "No bundler version in Gemfile.lock."
-  exit 1
-fi
-
-# Get the currently used bundler version.
-# We ignore all errors with `2>/dev/null || true` in case there is no bundler
-# or only an orphaned shim installed.
-current="$(bundler --version 2>/dev/null || true)"
-
-if [ "$current" = "Bundler version $version" ]; then
-  echo >&2 "Already up-to-date: $current"
-  exit 0
-fi
-
-# Passing on all arguments of this script with "$@".
-gem install bundler -v "$version" "$@"
-gem uninstall bundler -v "!= $version" 2>/dev/null || true
diff --git a/spec/support/performance_helper.rb b/spec/support/performance_helper.rb
index f0236997fb..8967258717 100644
--- a/spec/support/performance_helper.rb
+++ b/spec/support/performance_helper.rb
@@ -2,12 +2,12 @@
 
 module OpenFoodNetwork
   module PerformanceHelper
-    def multi_benchmark(num_samples, cache_key_patterns: [], &block)
+    def multi_benchmark(num_samples, cache_key_patterns: [], &)
       results = (0..num_samples).map do |_i|
         ActiveRecord::Base.connection.query_cache.clear
         delete_cache_keys(cache_key_patterns)
 
-        result = Benchmark.measure(&block)
+        result = Benchmark.measure(&)
 
         puts result
 
diff --git a/spec/system/admin/enterprises/dfc_permissions_spec.rb b/spec/system/admin/enterprises/dfc_permissions_spec.rb
index 7c86f6ed0f..b88c4e0d48 100644
--- a/spec/system/admin/enterprises/dfc_permissions_spec.rb
+++ b/spec/system/admin/enterprises/dfc_permissions_spec.rb
@@ -68,9 +68,9 @@ RSpec.describe "DFC Permissions", feature: "cqcm-dev", vcr: true do
     end
   end
 
-  def within_platform_list(variant, &block)
+  def within_platform_list(variant, &)
     retry_expectations(on: Ferrum::JavaScriptError) do
-      within(platform_list(variant), &block)
+      within(platform_list(variant), &)
     end
   end