diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..f7be8f7
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,12 @@
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+  - package-ecosystem: "composer"
+    directory: "/"
+    schedule:
+      interval: "monthly"
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..dd3991e
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,52 @@
+name: Automated tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  tests:
+    # https://github.com/actions/virtual-environments
+    runs-on: ubuntu-22.04
+    defaults:
+      run:
+        working-directory: ./Extensions
+
+    steps:
+    - name: Git checkout source code
+      uses: actions/checkout@v4
+      with:
+        path: Extensions
+
+    # Composer tests
+
+    - name: Check PHP syntax
+      run: composer run-script php-lint
+
+    - name: Check PHTML syntax
+      run: composer run-script phtml-lint
+
+    - name: Use Composer cache
+      id: composer-cache
+      uses: actions/cache@v4
+      with:
+        path: Extensions/vendor
+        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-php-
+
+    - name: Run Composer install
+      run: composer install --prefer-dist --no-progress
+      if: steps.composer-cache.outputs.cache-hit != 'true'
+
+    - name: Git checkout FreshRSS source code
+      uses: actions/checkout@v4
+      with:
+        repository: FreshRSS/FreshRSS
+        path: FreshRSS
+
+    - name: PHPStan
+      run: composer run-script phpstan
diff --git a/Controllers/readeckButtonController.php b/Controllers/readeckButtonController.php
index f9b0a6f..f6dde97 100644
--- a/Controllers/readeckButtonController.php
+++ b/Controllers/readeckButtonController.php
@@ -22,7 +22,7 @@ public function jsVarsAction(): void
       )
     ));
 
-    $this->view->_layout(false);
+    $this->view->_layout(null);
     $this->view->_path('readeckButton/vars.js');
 
     header('Content-Type: application/javascript; charset=utf-8');
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..627818f
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,55 @@
+{
+    "description": "Extension for FreshRSS",
+    "type": "project",
+    "require": {
+        "php": ">=8.1",
+        "ext-ctype": "*",
+        "ext-curl": "*",
+        "ext-dom": "*",
+        "ext-fileinfo": "*",
+        "ext-gmp": "*",
+        "ext-intl": "*",
+        "ext-json": "*",
+        "ext-libxml": "*",
+        "ext-mbstring": "*",
+        "ext-openssl": "*",
+        "ext-pcre": "*",
+        "ext-pdo": "*",
+        "ext-pdo_sqlite": "*",
+        "ext-session": "*",
+        "ext-simplexml": "*",
+        "ext-xml": "*",
+        "ext-xmlreader": "*",
+        "ext-zend-opcache": "*",
+        "ext-zip": "*",
+        "ext-zlib": "*"
+    },
+    "suggest": {
+        "ext-iconv": "*",
+        "ext-pdo_mysql": "*",
+        "ext-pdo_pgsql": "*"
+    },
+    "require-dev": {
+        "php": ">=8.1",
+        "ext-phar": "*",
+        "ext-tokenizer": "*",
+        "ext-xmlwriter": "*",
+        "phpstan/phpstan": "^1.11",
+        "phpstan/phpstan-strict-rules": "^1.6"
+    },
+    "scripts": {
+        "php-lint": "find . -type d -name 'vendor' -prune -o -name '*.php' -print0 | xargs -0 -n1 -P4 php -l 1>/dev/null",
+        "phtml-lint": "find . -type d -name 'vendor' -prune -o -name '*.phtml' -print0 | xargs -0 -n1 -P4 php -l 1>/dev/null",
+        "phpstan": "phpstan analyse --memory-limit 512M .",
+        "test": [
+            "@php-lint",
+            "@phtml-lint",
+            "@phpstan"
+        ]
+    },
+    "config": {
+        "allow-plugins": {
+            "phpstan/extension-installer": false
+        }
+    }
+}
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..95dcf52
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,153 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "bdd5cabc1199cf7269f51431ba759ccb",
+    "packages": [],
+    "packages-dev": [
+        {
+            "name": "phpstan/phpstan",
+            "version": "1.12.7",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "dc2b9976bd8b0f84ec9b0e50cc35378551de7af0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/dc2b9976bd8b0f84ec9b0e50cc35378551de7af0",
+                "reference": "dc2b9976bd8b0f84ec9b0e50cc35378551de7af0",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
+            "bin": [
+                "phpstan",
+                "phpstan.phar"
+            ],
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPStan - PHP Static Analysis Tool",
+            "keywords": [
+                "dev",
+                "static analysis"
+            ],
+            "support": {
+                "docs": "https://phpstan.org/user-guide/getting-started",
+                "forum": "https://github.com/phpstan/phpstan/discussions",
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "security": "https://github.com/phpstan/phpstan/security/policy",
+                "source": "https://github.com/phpstan/phpstan-src"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-10-18T11:12:07+00:00"
+        },
+        {
+            "name": "phpstan/phpstan-strict-rules",
+            "version": "1.6.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan-strict-rules.git",
+                "reference": "daeec748b53de80a97498462513066834ec28f8b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan-strict-rules/zipball/daeec748b53de80a97498462513066834ec28f8b",
+                "reference": "daeec748b53de80a97498462513066834ec28f8b",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0",
+                "phpstan/phpstan": "^1.12.4"
+            },
+            "require-dev": {
+                "nikic/php-parser": "^4.13.0",
+                "php-parallel-lint/php-parallel-lint": "^1.2",
+                "phpstan/phpstan-deprecation-rules": "^1.1",
+                "phpstan/phpstan-phpunit": "^1.0",
+                "phpunit/phpunit": "^9.5"
+            },
+            "type": "phpstan-extension",
+            "extra": {
+                "phpstan": {
+                    "includes": [
+                        "rules.neon"
+                    ]
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PHPStan\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Extra strict and opinionated rules for PHPStan",
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan-strict-rules/issues",
+                "source": "https://github.com/phpstan/phpstan-strict-rules/tree/1.6.1"
+            },
+            "time": "2024-09-20T14:04:44+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=8.1",
+        "ext-ctype": "*",
+        "ext-curl": "*",
+        "ext-dom": "*",
+        "ext-fileinfo": "*",
+        "ext-gmp": "*",
+        "ext-intl": "*",
+        "ext-json": "*",
+        "ext-libxml": "*",
+        "ext-mbstring": "*",
+        "ext-openssl": "*",
+        "ext-pcre": "*",
+        "ext-pdo": "*",
+        "ext-pdo_sqlite": "*",
+        "ext-session": "*",
+        "ext-simplexml": "*",
+        "ext-xml": "*",
+        "ext-xmlreader": "*",
+        "ext-zend-opcache": "*",
+        "ext-zip": "*",
+        "ext-zlib": "*"
+    },
+    "platform-dev": {
+        "php": ">=8.1",
+        "ext-phar": "*",
+        "ext-tokenizer": "*",
+        "ext-xmlwriter": "*"
+    },
+    "plugin-api-version": "2.6.0"
+}
diff --git a/docker-compose.yaml b/docker-compose.yaml
index b5b52d1..8dd62cb 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -2,12 +2,8 @@ services:
   freshrss:
     image: freshrss/freshrss:latest
     container_name: freshrss
-    restart: unless-stopped
-    logging:
-      options:
-        max-size: 10m
     volumes:
       - ./fresh_rss_data:/var/www/FreshRSS/data
-      - ./:/var/www/FreshRSS/extensions/freshrss-readeck-button
+      - ./:/var/www/FreshRSS/extensions/freshrss-readeck-button:ro
     ports:
       - 8080:80
diff --git a/phpstan.dist.neon b/phpstan.dist.neon
new file mode 100644
index 0000000..185bbaf
--- /dev/null
+++ b/phpstan.dist.neon
@@ -0,0 +1,44 @@
+parameters:
+	level: 6 # TODO: Increase to 9
+	fileExtensions:
+		- php
+		- phtml
+	paths:
+		- ../FreshRSS
+		- .
+	excludePaths:
+		analyse:
+			- ../FreshRSS
+			- vendor/
+			- fresh_rss_data/
+		analyseAndScan:
+			- .github/
+			- .vscode/
+			- .git/
+			- node_modules/
+	checkMissingOverrideMethodAttribute: true
+	reportMaybesInPropertyPhpDocTypes: false
+	treatPhpDocTypesAsCertain: false
+	strictRules:
+		allRules: false
+		booleansInConditions: true
+		closureUsesThis: true
+		disallowedConstructs: false
+		disallowedLooseComparison: false
+		matchingInheritedMethodNames: true
+		noVariableVariables: true
+		numericOperandsInArithmeticOperators: true
+		overwriteVariablesWithLoop: true
+		requireParentConstructorCall: true
+		strictCalls: true
+		switchConditionsMatchingType: true
+		uselessCast: true
+	exceptions:
+		check:
+			missingCheckedExceptionInThrows: false	# TODO pass
+			tooWideThrowType: true
+		implicitThrows: false
+		checkedExceptionClasses:
+			- 'Minz_Exception'
+includes:
+	- vendor/phpstan/phpstan-strict-rules/rules.neon