diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2bd50a94f..18aae48e9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@
 
 [Full changelog][unreleased]
 
+- Remove Spring from development
+- Switch to the Zeitwerk autoloader
+
 ## Release 153 - 2024-12-02
 
 [Full changelog][153]
diff --git a/Gemfile b/Gemfile
index 0829c55e2..506b1c9bd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -67,9 +67,6 @@ group :development do
   gem "better_errors"
   gem "html2haml"
   gem "listen", ">= 3.0.5", "< 3.10"
-  gem "spring"
-  gem "spring-commands-rspec"
-  gem "spring-watcher-listen", "~> 2.1.0"
   gem "rails_layout"
   gem "web-console", ">= 3.3.0"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 8e74ae9b7..e6c958f2f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -479,12 +479,6 @@ GEM
     slim (4.1.0)
       temple (>= 0.7.6, < 0.9)
       tilt (>= 2.0.6, < 2.1)
-    spring (4.2.1)
-    spring-commands-rspec (1.0.4)
-      spring (>= 0.9.1)
-    spring-watcher-listen (2.1.0)
-      listen (>= 2.7, < 4.0)
-      spring (>= 4)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
@@ -608,9 +602,6 @@ DEPENDENCIES
   sidekiq (~> 7)
   simplecov (~> 0.22.0)
   simplecov-lcov (~> 0.8.0)
-  spring
-  spring-commands-rspec
-  spring-watcher-listen (~> 2.1.0)
   standard
   strip_attributes
   tzinfo-data
diff --git a/bin/rails b/bin/rails
index 40b071ea5..073966023 100755
--- a/bin/rails
+++ b/bin/rails
@@ -1,5 +1,4 @@
 #!/usr/bin/env ruby
-load File.expand_path("spring", __dir__)
 APP_PATH = File.expand_path('../config/application', __dir__)
 require_relative '../config/boot'
 require 'rails/commands'
diff --git a/bin/rake b/bin/rake
index 7327f471e..4fbf10b96 100755
--- a/bin/rake
+++ b/bin/rake
@@ -1,5 +1,4 @@
 #!/usr/bin/env ruby
-load File.expand_path("spring", __dir__)
 require_relative "../config/boot"
 require "rake"
 Rake.application.run
diff --git a/bin/rspec b/bin/rspec
index 053bb19a3..caedbbad6 100755
--- a/bin/rspec
+++ b/bin/rspec
@@ -1,10 +1,5 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-begin
-  load File.expand_path('spring', __dir__)
-rescue LoadError => e
-  raise unless e.message.include?('spring')
-end
 require 'bundler/setup'
 load Gem.bin_path('rspec-core', 'rspec')
diff --git a/bin/spring b/bin/spring
deleted file mode 100755
index b4147e843..000000000
--- a/bin/spring
+++ /dev/null
@@ -1,14 +0,0 @@
-#!/usr/bin/env ruby
-if !defined?(Spring) && [nil, "development", "test"].include?(ENV["RAILS_ENV"])
-  gem "bundler"
-  require "bundler"
-
-  # Load Spring without loading other gems in the Gemfile, for speed.
-  Bundler.locked_gems&.specs&.find { |spec| spec.name == "spring" }&.tap do |spring|
-    Gem.use_paths Gem.dir, Bundler.bundle_path.to_s, *Gem.path
-    gem "spring", spring.version
-    require "spring/binstub"
-  rescue Gem::LoadError
-    # Ignore when Spring is not installed.
-  end
-end
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 7567499e4..389fb74e0 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -10,14 +10,10 @@
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
-  config.cache_classes = !(defined?(Spring::Env) && Spring::Env.new.server_running?)
+  config.cache_classes = false
 
   config.action_view.cache_template_loading = true
 
-  # Prevent 'reloading is disabled' errors from Spring
-  # https://github.com/rails/spring/issues/598
-  config.autoloader = :classic
-
   # Do not eager load code on boot. This avoids loading your whole application
   # just for the purpose of running a single test. If you are using a tool that
   # preloads Rails for running tests, you may have to set it to true.
diff --git a/config/spring.rb b/config/spring.rb
deleted file mode 100644
index 83202c25d..000000000
--- a/config/spring.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# frozen_string_literal: true
-
-Spring.watch(
-  ".ruby-version",
-  ".rbenv-vars",
-  "tmp/restart.txt",
-  "tmp/caching-dev.txt"
-)
-
-Spring.after_fork do
-  if Rails.env.test?
-    RSpec.configure do |config|
-      config.seed = srand % 0xFFFF unless ARGV.any? { |arg| arg =~ /seed/ }
-    end
-  end
-end
diff --git a/spec/models/guidance_url_spec.rb b/spec/models/guidance_url_spec.rb
index cb008cf0c..113acd9e1 100644
--- a/spec/models/guidance_url_spec.rb
+++ b/spec/models/guidance_url_spec.rb
@@ -1,6 +1,6 @@
 require "rails_helper"
 
-RSpec.describe Activity::GuidanceUrl, type: :model do
+RSpec.describe GuidanceUrl, type: :model do
   describe "#to_s" do
     it "returns a url if one exists" do
       url = GuidanceUrl.new(:activity, :programme_status)