diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e8b6b77c..d2f0943e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -107,6 +107,13 @@ jobs:
       env:
         BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}.gemfile
 
+    - name: Report to Coveralls
+      uses: coverallsapp/github-action@v1.1.2
+      with:
+        github-token: ${{ secrets.github_token }}
+        flag-name: test-${{ matrix.ruby }}-${{ matrix.gemfile }}
+        parallel: true
+
 
   finish:
     needs: test
@@ -114,7 +121,7 @@ jobs:
     steps:
 
     - name: Report completion to Coveralls
-      uses: coverallsapp/github-action@v1
+      uses: coverallsapp/github-action@v1.1.2
       with:
         github-token: ${{ secrets.github_token }}
         parallel-finished: true
diff --git a/gemfiles/pry010.gemfile b/gemfiles/pry010.gemfile
index 4503b67c..1daca580 100644
--- a/gemfiles/pry010.gemfile
+++ b/gemfiles/pry010.gemfile
@@ -4,6 +4,7 @@ gem 'rack', RUBY_VERSION < '2.2.2' ? '~> 1.6' : '~> 2.0'
 gem "binding_of_caller"
 gem "pry", "~> 0.10.0"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/pry011.gemfile b/gemfiles/pry011.gemfile
index 761c5918..206b89d7 100644
--- a/gemfiles/pry011.gemfile
+++ b/gemfiles/pry011.gemfile
@@ -3,6 +3,7 @@ source "https://rubygems.org"
 gem 'rack', RUBY_VERSION < '2.2.2' ? '~> 1.6' : '~> 2.0'
 gem "pry", "~> 0.11.0pre"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/pry09.gemfile b/gemfiles/pry09.gemfile
index db7fa6bc..130326b9 100644
--- a/gemfiles/pry09.gemfile
+++ b/gemfiles/pry09.gemfile
@@ -3,6 +3,7 @@ source "https://rubygems.org"
 gem 'rack', RUBY_VERSION < '2.2.2' ? '~> 1.6' : '~> 2.0'
 gem "pry", "~> 0.9.12"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rack.gemfile b/gemfiles/rack.gemfile
index 4f2bab73..b5bbff7a 100644
--- a/gemfiles/rack.gemfile
+++ b/gemfiles/rack.gemfile
@@ -2,6 +2,7 @@ source "https://rubygems.org"
 
 gem 'rack', RUBY_VERSION < '2.2.2' ? '~> 1.6' : '~> 2.0'
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rack_boc.gemfile b/gemfiles/rack_boc.gemfile
index 0899c028..09520d9b 100644
--- a/gemfiles/rack_boc.gemfile
+++ b/gemfiles/rack_boc.gemfile
@@ -3,6 +3,7 @@ source "https://rubygems.org"
 gem 'rack', RUBY_VERSION < '2.2.2' ? '~> 1.6' : '~> 2.0'
 gem "binding_of_caller"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails42.gemfile b/gemfiles/rails42.gemfile
index ba2e191f..caaeb8ef 100644
--- a/gemfiles/rails42.gemfile
+++ b/gemfiles/rails42.gemfile
@@ -4,6 +4,7 @@ gem "rails", "~> 4.2.0"
 gem 'nokogiri', RUBY_VERSION < '2.1' ? '~> 1.6.0' : '>= 1.7'
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails42_boc.gemfile b/gemfiles/rails42_boc.gemfile
index 2e66ac54..c3619a6a 100644
--- a/gemfiles/rails42_boc.gemfile
+++ b/gemfiles/rails42_boc.gemfile
@@ -5,6 +5,7 @@ gem 'nokogiri', RUBY_VERSION < '2.1' ? '~> 1.6.0' : '>= 1.7'
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 gem "binding_of_caller"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails42_haml.gemfile b/gemfiles/rails42_haml.gemfile
index a22370a6..6f656aae 100644
--- a/gemfiles/rails42_haml.gemfile
+++ b/gemfiles/rails42_haml.gemfile
@@ -5,6 +5,7 @@ gem 'nokogiri', RUBY_VERSION < '2.1' ? '~> 1.6.0' : '>= 1.7'
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 gem "haml"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails50.gemfile b/gemfiles/rails50.gemfile
index 7d31f08d..856109f5 100644
--- a/gemfiles/rails50.gemfile
+++ b/gemfiles/rails50.gemfile
@@ -3,6 +3,7 @@ source "https://rubygems.org"
 gem "rails", "~> 5.0.0"
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails50_boc.gemfile b/gemfiles/rails50_boc.gemfile
index a7955aad..6632ab09 100644
--- a/gemfiles/rails50_boc.gemfile
+++ b/gemfiles/rails50_boc.gemfile
@@ -4,6 +4,7 @@ gem "rails", "~> 5.0.0"
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 gem "binding_of_caller"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails50_haml.gemfile b/gemfiles/rails50_haml.gemfile
index 5ad597ec..c549086b 100644
--- a/gemfiles/rails50_haml.gemfile
+++ b/gemfiles/rails50_haml.gemfile
@@ -4,6 +4,7 @@ gem "rails", "~> 5.0.0"
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 gem "haml"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails51.gemfile b/gemfiles/rails51.gemfile
index 5532febb..6b80d819 100644
--- a/gemfiles/rails51.gemfile
+++ b/gemfiles/rails51.gemfile
@@ -3,6 +3,7 @@ source "https://rubygems.org"
 gem "rails", "~> 5.1.0"
 gem 'i18n', '< 1.5.2', require: false if RUBY_VERSION < '2.3'
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails51_boc.gemfile b/gemfiles/rails51_boc.gemfile
index bfb2cc92..391459d4 100644
--- a/gemfiles/rails51_boc.gemfile
+++ b/gemfiles/rails51_boc.gemfile
@@ -4,6 +4,7 @@ gem "rails", "~> 5.1.0"
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 gem "binding_of_caller"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails51_haml.gemfile b/gemfiles/rails51_haml.gemfile
index a870a7cf..4be7c4bc 100644
--- a/gemfiles/rails51_haml.gemfile
+++ b/gemfiles/rails51_haml.gemfile
@@ -4,6 +4,7 @@ gem "rails", "~> 5.1.0"
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 gem "haml"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails52.gemfile b/gemfiles/rails52.gemfile
index 070970cd..887de07d 100644
--- a/gemfiles/rails52.gemfile
+++ b/gemfiles/rails52.gemfile
@@ -3,6 +3,7 @@ source "https://rubygems.org"
 gem "rails", "~> 5.2.0"
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails52_boc.gemfile b/gemfiles/rails52_boc.gemfile
index 195e4e23..669c73fd 100644
--- a/gemfiles/rails52_boc.gemfile
+++ b/gemfiles/rails52_boc.gemfile
@@ -4,6 +4,7 @@ gem "rails", "~> 5.2.0"
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 gem "binding_of_caller"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails52_haml.gemfile b/gemfiles/rails52_haml.gemfile
index dd9f0dc9..c2bb1f57 100644
--- a/gemfiles/rails52_haml.gemfile
+++ b/gemfiles/rails52_haml.gemfile
@@ -4,6 +4,7 @@ gem "rails", "~> 5.2.0"
 gem 'i18n', '< 1.5.2' if RUBY_VERSION < '2.3'
 gem "haml"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails60.gemfile b/gemfiles/rails60.gemfile
index 55f89c5e..825f46ca 100644
--- a/gemfiles/rails60.gemfile
+++ b/gemfiles/rails60.gemfile
@@ -2,6 +2,7 @@ source "https://rubygems.org"
 
 gem "rails", "~> 6.0.0"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails60_boc.gemfile b/gemfiles/rails60_boc.gemfile
index 190c573c..c32cb5d9 100644
--- a/gemfiles/rails60_boc.gemfile
+++ b/gemfiles/rails60_boc.gemfile
@@ -3,6 +3,7 @@ source "https://rubygems.org"
 gem "rails", "~> 6.0.0"
 gem "binding_of_caller"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/gemfiles/rails60_haml.gemfile b/gemfiles/rails60_haml.gemfile
index 84d3401a..e4f3179c 100644
--- a/gemfiles/rails60_haml.gemfile
+++ b/gemfiles/rails60_haml.gemfile
@@ -3,6 +3,7 @@ source "https://rubygems.org"
 gem "rails", "~> 6.0.0"
 gem "haml"
 
-gem 'coveralls', require: false
+gem 'simplecov',      require: false
+gem 'simplecov-lcov', require: false
 
 gemspec path: "../"
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 29e5ac18..45fde6a2 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -2,19 +2,23 @@
 
 ENV["EDITOR"] = nil
 
-# Ruby 2.4.0 and 2.4.1 has a bug with its Coverage module that causes segfaults.
-# https://bugs.ruby-lang.org/issues/13305
-# 2.4.2 should include this patch.
 if ENV['CI']
-  unless RUBY_VERSION == '2.4.0' || RUBY_VERSION == '2.4.1'
-    require 'coveralls'
-    Coveralls.wear! do
-      add_filter 'spec/'
-    end
-  end
-else
   require 'simplecov'
-  SimpleCov.start
+  require 'simplecov-lcov'
+
+  SimpleCov::Formatter::LcovFormatter.config do |c|
+    c.report_with_single_file = true
+    c.single_report_path = 'coverage/lcov.info'
+  end
+  SimpleCov.formatters = SimpleCov::Formatter::MultiFormatter.new(
+    [
+      SimpleCov::Formatter::HTMLFormatter,
+      SimpleCov::Formatter::LcovFormatter,
+    ]
+  )
+  SimpleCov.start do
+    add_filter 'spec/'
+  end
 end
 
 require 'bundler/setup'