diff --git a/Gemfile b/Gemfile
index 1797822..9d12852 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,6 +3,8 @@ source 'https://rubygems.org'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '6.1.3.2'
+# Use Puma as the app server
+gem 'puma', '~> 5.0'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.4.1'
 
@@ -37,9 +39,6 @@ gem 'sdoc', '~> 2.1.0',          group: :doc
 gem 'web-console', '~> 4.1.0', group: :development
 gem 'listen', '~> 3.5.1', group: :development
 
-# Use Codacy for coverage
-gem 'codacy-coverage', :require => false
-
 gem 'bootstrap', '~> 4.5.3'
 gem "bootstrap_form", "~> 4.5"
 gem 'font-awesome-sass', '~> 5.15.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1fd7557..de1be85 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -76,8 +76,6 @@ GEM
       actionpack (>= 5.2)
       activemodel (>= 5.2)
     builder (3.2.4)
-    codacy-coverage (2.2.1)
-      simplecov
     coffee-rails (5.0.0)
       coffee-script (>= 2.2.0)
       railties (>= 5.2.0)
@@ -97,7 +95,6 @@ GEM
       warden (~> 1.2.3)
     diff-lcs (1.4.4)
     diffy (3.4.0)
-    docile (1.3.2)
     erubi (1.10.0)
     execjs (2.7.0)
     faraday (1.0.0)
@@ -158,6 +155,8 @@ GEM
     orm_adapter (0.5.0)
     popper_js (1.16.0)
     public_suffix (4.0.6)
+    puma (5.3.1)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-test (1.1.0)
@@ -214,10 +213,6 @@ GEM
       tilt
     sdoc (2.1.0)
       rdoc (>= 5.0)
-    simplecov (0.18.1)
-      docile (~> 1.1)
-      simplecov-html (~> 0.11.0)
-    simplecov-html (0.11.0)
     sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -261,7 +256,6 @@ DEPENDENCIES
   bootsnap
   bootstrap (~> 4.5.3)
   bootstrap_form (~> 4.5)
-  codacy-coverage
   coffee-rails (~> 5.0.0)
   devise (~> 4.8.0)
   diff-lcs
@@ -273,6 +267,7 @@ DEPENDENCIES
   mysql2 (~> 0.5.2)
   omniauth
   omniauth-github
+  puma (~> 5.0)
   rails (= 6.1.3.2)
   rails-controller-testing
   rails-i18n (~> 6.0.0)
@@ -288,4 +283,4 @@ DEPENDENCIES
   will_paginate-bootstrap4 (~> 0.2.2)
 
 BUNDLED WITH
-   2.1.4
+   2.2.17
diff --git a/README.md b/README.md
index 2a91c5b..c7508aa 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,6 @@ Projekt Euler
 =============
 
 ![Build Status](https://github.com/projekteuler/projekteuler/workflows/CI/badge.svg)
-[![Codacy Badge](https://api.codacy.com/project/badge/Grade/68921bff5347435f8fff10c1d6872568)](https://www.codacy.com/app/projekteuler/projekteuler)
 
 This is the Ruby on Rails web-app powering [projekteuler.de](https://projekteuler.de).
 It allows visitors to view and suggest German translations of the maths puzzles found on [projecteuler.net](https://projecteuler.net).
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 80ecbda..40dab94 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,8 +1,5 @@
-require 'codacy-coverage'
 require 'webmock/minitest'
 
-Codacy::Reporter.start
-
 ENV['RAILS_ENV'] ||= 'test'
 require File.expand_path('../../config/environment', __FILE__)
 require 'rails/test_help'