diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
deleted file mode 100644
index 719bda6..0000000
--- a/.github/workflows/coverage.yml
+++ /dev/null
@@ -1,19 +0,0 @@
----
-name: Coverage
-
-on: [push]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v7
-    - name: Install Ruby (3.4)
-      uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: 3.4
-        bundler-cache: true
-    - name: Build and test with RSpec
-      run: RACK_ENV=test bundle exec rake spec
-      env:
-        COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a917b3a..5e9e543 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -4,6 +4,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         ruby-version:
           - "3.1"
@@ -21,7 +22,17 @@ jobs:
           ruby-version: ${{ matrix.ruby-version }}
           bundler-cache: true
       - name: Run Tests
-        run: RACK_ENV=test bundle exec rake spec
+        env:
+          RACK_ENV: test
+          CI: true
+        run: bundle exec rake spec
+      - name: Report coverage to Coveralls
+        uses: coverallsapp/github-action@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: coverage/lcov.info
+          flag-name: ${{ matrix.ruby-version }}
+          parallel: true
   integration:
     runs-on: ubuntu-latest
     steps:
@@ -33,3 +44,12 @@ jobs:
           bundler-cache: true
       - name: Run Integration Tests
         run: RACK_ENV=test bundle exec rake spec:integration
+  coverage-finished:
+    needs: [test]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Report coverage build as finished
+        uses: coverallsapp/github-action@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          parallel-finished: true
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e744cbc..24b3342 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 * [#108](https://github.com/dblock/strava-ruby-client/pull/108): Adds an integration test that verifies the real Strava API endpoint is reachable, run in CI on every push and pull request via `rake spec:integration` - [@dblock](https://github.com/dblock).
 * [#107](https://github.com/dblock/strava-ruby-client/pull/107): Fixes `explore_segments` and `star_segment` raising `UncaughtThrowError` instead of `ArgumentError` for missing required arguments - [@dblock](https://github.com/dblock).
 * [#107](https://github.com/dblock/strava-ruby-client/pull/107): Fixes `start_date_local` to always derive the timezone offset from the difference between `start_date` and `start_date_local`, since Strava's `timezone` property does not account for daylight saving time - [@dblock](https://github.com/dblock).
+* [#109](https://github.com/dblock/strava-ruby-client/pull/109): Fixed coverage reporting to Coveralls not running on pull requests, and to report coverage from every Ruby/JRuby test matrix job merged into a single build, by switching from `coveralls_reborn`/`COVERALLS_REPO_TOKEN` to `coverallsapp/github-action`/`GITHUB_TOKEN` - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 ### 3.0.0 (2025/10/24)
diff --git a/Gemfile b/Gemfile
index 8b1cfd4..d3f59ce 100755
--- a/Gemfile
+++ b/Gemfile
@@ -27,5 +27,6 @@ group :development, :test do
 end
 
 group :test do
-  gem 'coveralls_reborn', require: false
+  gem 'simplecov'
+  gem 'simplecov-lcov', require: false
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 3b1f171..d662033 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -4,8 +4,16 @@
 
 require 'rubygems'
 
-require 'coveralls'
-Coveralls.wear!
+require 'simplecov'
+require 'simplecov-lcov'
+
+SimpleCov::Formatter::LcovFormatter.config.report_with_single_file = true
+SimpleCov::Formatter::LcovFormatter.config.single_report_path = 'coverage/lcov.info'
+SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter.new([
+                                                                 SimpleCov::Formatter::HTMLFormatter,
+                                                                 SimpleCov::Formatter::LcovFormatter
+                                                               ])
+SimpleCov.start
 
 require 'rspec'
 require 'strava-ruby-client'