diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..9e13309
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+export JRUBY_OPTS="--debug"
diff --git a/.github/workflows/jruby.yml b/.github/workflows/jruby.yml
new file mode 100644
index 0000000..0fd08f3
--- /dev/null
+++ b/.github/workflows/jruby.yml
@@ -0,0 +1,37 @@
+name: RSpec on JRuby
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  schedule:
+    - cron: "0 21 * * 6"
+
+env:
+  JRUBY_OPTS: "--debug"
+
+jobs:
+  rspec:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 10
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: ["jruby-9.4", "jruby-head"]
+
+    steps:
+      - uses: actions/checkout@v4
+      - run: rm -f Gemfile.lock
+      - run: rm -f .ruby-version
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          rubygems: latest
+          bundler: latest
+          bundler-cache: true
+
+      - run: bundle exec rspec
diff --git a/Gemfile b/Gemfile
index 79d19a1..74963f6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,10 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in errbit_plugin.gemspec
 gemspec
 
+gem "rake"
 gem 'rspec'
+gem "simplecov", require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 7569030..21c40ef 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,6 +7,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     diff-lcs (1.6.1)
+    docile (1.4.1)
     rake (13.2.1)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
@@ -21,6 +22,12 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.2)
+    simplecov (0.22.0)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.13.1)
+    simplecov_json_formatter (0.1.4)
 
 PLATFORMS
   arm64-darwin-24
@@ -29,6 +36,7 @@ DEPENDENCIES
   errbit_plugin!
   rake
   rspec
+  simplecov
 
 BUNDLED WITH
    2.6.7
diff --git a/Rakefile b/Rakefile
index 2995527..5263b58 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "bundler/gem_tasks"
diff --git a/errbit_plugin.gemspec b/errbit_plugin.gemspec
index 99d06c7..c5883ad 100644
--- a/errbit_plugin.gemspec
+++ b/errbit_plugin.gemspec
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'errbit_plugin/version'
@@ -16,6 +18,4 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
-
-  spec.add_development_dependency "rake"
 end
diff --git a/lib/errbit_plugin.rb b/lib/errbit_plugin.rb
index fb7699b..4a54ca1 100644
--- a/lib/errbit_plugin.rb
+++ b/lib/errbit_plugin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "errbit_plugin/version"
 require "errbit_plugin/registry"
 require "errbit_plugin/issue_tracker"
diff --git a/lib/errbit_plugin/issue_tracker.rb b/lib/errbit_plugin/issue_tracker.rb
index 83b5131..aaf9200 100644
--- a/lib/errbit_plugin/issue_tracker.rb
+++ b/lib/errbit_plugin/issue_tracker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ErrbitPlugin
   # abstract class for issue trackers
   class IssueTracker
diff --git a/lib/errbit_plugin/issue_trackers/none.rb b/lib/errbit_plugin/issue_trackers/none.rb
index 6726ea5..6bd59a8 100644
--- a/lib/errbit_plugin/issue_trackers/none.rb
+++ b/lib/errbit_plugin/issue_trackers/none.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ErrbitPlugin
   class NoneIssueTracker < IssueTracker
     def self.label; 'none'; end
diff --git a/lib/errbit_plugin/registry.rb b/lib/errbit_plugin/registry.rb
index 1ab9519..35b1b88 100644
--- a/lib/errbit_plugin/registry.rb
+++ b/lib/errbit_plugin/registry.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ErrbitPlugin
   class IncompatibilityError < StandardError; end
   class AlreadyRegisteredError < StandardError; end
diff --git a/lib/errbit_plugin/validate_issue_tracker.rb b/lib/errbit_plugin/validate_issue_tracker.rb
index 246934d..bbb8c58 100644
--- a/lib/errbit_plugin/validate_issue_tracker.rb
+++ b/lib/errbit_plugin/validate_issue_tracker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ErrbitPlugin
   class ValidateIssueTracker
     def initialize(klass)
diff --git a/lib/errbit_plugin/version.rb b/lib/errbit_plugin/version.rb
index b7829c4..4f5e6c5 100644
--- a/lib/errbit_plugin/version.rb
+++ b/lib/errbit_plugin/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ErrbitPlugin
   VERSION = '0.7.0'
 end
diff --git a/spec/errbit_plugin/registry_spec.rb b/spec/errbit_plugin/registry_spec.rb
index 982b193..edd44cb 100644
--- a/spec/errbit_plugin/registry_spec.rb
+++ b/spec/errbit_plugin/registry_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe ErrbitPlugin::Registry do
diff --git a/spec/errbit_plugin/validate_issue_tracker_spec.rb b/spec/errbit_plugin/validate_issue_tracker_spec.rb
index 1b73870..1d3e6a3 100644
--- a/spec/errbit_plugin/validate_issue_tracker_spec.rb
+++ b/spec/errbit_plugin/validate_issue_tracker_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe ErrbitPlugin::ValidateIssueTracker do
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 92338c7..d263a08 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,16 +1,8 @@
-if ENV['COVERAGE']
-  require 'simplecov'
-  if ENV['CI']
-    require 'coveralls'
-    Coveralls.wear!
-    SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
-      SimpleCov::Formatter::HTMLFormatter,
-      Coveralls::SimpleCov::Formatter
-    ]
-  end
+# frozen_string_literal: true
 
-  SimpleCov.start
-end
+require 'simplecov'
+
+SimpleCov.start
 
 require 'errbit_plugin'