diff --git a/.coveralls.yml b/.coveralls.yml
new file mode 100644
index 0000000..4236760
--- /dev/null
+++ b/.coveralls.yml
@@ -0,0 +1 @@
+service_name: symplicity-outlook
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 70ea531..453a165 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,12 +4,16 @@ on:
   workflow_dispatch:
 
   push:
+    branches:
+      - master
     paths-ignore:
       - '*.md'
       - '.github/**'
       - 'example/**'
 
   pull_request:
+    branches:
+      - master
     paths-ignore:
       - '*.md'
       - '.github/**'
@@ -49,5 +53,21 @@ jobs:
         run: vendor/bin/phpstan
 
       - name: Tests
-        run: vendor/bin/phpunit --coverage-clover clover.xml
+        run: |
+          mkdir -p ./build/logs
+          vendor/bin/phpunit --coverage-clover ./build/logs/clover.xml
+
+      - name: Verify coverage file is created
+        run: |
+          if [ ! -f ./build/logs/clover.xml ]; then
+            echo "clover.xml file was not created"
+            exit 1
+          fi
+
+      - name: Upload coverage
+        env:
+          COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          composer global require php-coveralls/php-coveralls
+          php-coveralls --coverage_clover=./build/logs/clover.xml -v
 
diff --git a/src/Notification/Subscription.php b/src/Notification/Subscription.php
index e214db3..fe39a9f 100644
--- a/src/Notification/Subscription.php
+++ b/src/Notification/Subscription.php
@@ -81,6 +81,9 @@ public function renew(string $subscriptionId, \DateTime $expiration, array $args
         }
     }
 
+    /**
+     * @param array<string, mixed> $args
+     */
     public function delete(string $subscriptionId, array $args = []): void
     {
         try {