diff --git a/.github/workflows/phpstan.yml b/.github/workflows/phpstan.yml
new file mode 100644
index 0000000..225a807
--- /dev/null
+++ b/.github/workflows/phpstan.yml
@@ -0,0 +1,39 @@
+name: Tests PHPStan in environments
+
+on: [pull_request]
+
+jobs:
+  php82-laravel-latest-phpstan-postgres:
+    runs-on: ubuntu-latest
+    container:
+      image: escolalms/php:8.2
+
+    services:
+      postgres:
+        image: postgres:12
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: test
+          TZ: Europe/Warsaw
+        ports:
+          - 5432:5432
+
+    steps:
+      - name: Instantiate package
+        uses: actions/checkout@v2
+
+      - name: Setup environment
+        run: cp env/postgres/* .
+
+      - name: Update composer
+        run: COMPOSER_ROOT_VERSION=0.9.9 composer update
+
+      - name: Clear config
+        run: vendor/bin/testbench config:clear
+
+      - name: Publish things
+        run: vendor/bin/testbench migrate:fresh
+
+      - name: Run tests
+        run: vendor/bin/phpstan analyse
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2631d56..72b995b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -101,12 +101,12 @@ jobs:
       - name: Instantiate package
         uses: actions/checkout@v2
 
-      - name: Update composer
-        run: composer update
-
       - name: Setup environment
         run: cp env/postgres/* .
 
+      - name: Update composer
+        run: composer update
+
       - name: Clear config
         run: vendor/bin/testbench config:clear
 
@@ -147,12 +147,12 @@ jobs:
       - name: Instantiate package
         uses: actions/checkout@v2
 
-      - name: Update composer
-        run: composer update
-
       - name: Setup environment
         run: cp env/postgres/* .
 
+      - name: Update composer
+        run: composer update
+
       - name: Clear config
         run: vendor/bin/testbench config:clear
 
diff --git a/composer.json b/composer.json
index 2f77089..b89ae9f 100644
--- a/composer.json
+++ b/composer.json
@@ -28,8 +28,9 @@
     "escolalms/topic-type-project": "^0",
     "escolalms/assign-without-account": "^0",
     "escolalms/video": "^0",
-    "orchestra/testbench": "^5.0|^6.0",
-    "phpunit/phpunit": "^9.0"
+    "orchestra/testbench": ">=5.0",
+    "phpunit/phpunit": "^9.0",
+    "nunomaduro/larastan": "^2.0"
   },
   "suggest": {
     "escolalms/auth": "^0.1.54",
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..130082e
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,10 @@
+includes:
+    - ./vendor/nunomaduro/larastan/extension.neon
+
+parameters:
+
+    paths:
+        - src/
+
+    # The level 9 is the highest level
+    level: 1
diff --git a/src/Core/EmailChannel.php b/src/Core/EmailChannel.php
index 18fc969..aa544d9 100644
--- a/src/Core/EmailChannel.php
+++ b/src/Core/EmailChannel.php
@@ -73,8 +73,11 @@ private static function fixHtml(string $html): string
     public static function sections(): Collection
     {
         return new Collection([
+            // @phpstan-ignore-next-line
             new TemplateSectionSchema('title', TemplateSectionTypeEnum::SECTION_TEXT(), true),
+            // @phpstan-ignore-next-line
             new TemplateSectionSchema('content', TemplateSectionTypeEnum::SECTION_MJML(), true),
+            // @phpstan-ignore-next-line
             new TemplateSectionSchema('contentHtml', TemplateSectionTypeEnum::SECTION_HTML(), false, true),
         ]);
     }
diff --git a/src/Services/MjmlService.php b/src/Services/MjmlService.php
index 7e23f24..c580324 100644
--- a/src/Services/MjmlService.php
+++ b/src/Services/MjmlService.php
@@ -20,7 +20,7 @@ public function render(string $mjml): string
                 throw new Exception('Missing MJML API id and/or secret');
             }
 
-            $renderer = new ApiRenderer($apiId, $apiSecret);
+            $renderer = new ApiRenderer($apiId);
         } else {
             $renderer = new BinaryRenderer();
         }