diff --git a/.gitignore b/.gitignore
index e2a3893..91e84a8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /vendor/
 composer.lock
 *.cache
+/.phpstan-cache
diff --git a/README.md b/README.md
index bd4617e..d8c563f 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,10 @@ function withContext(array $context) : self
 Returns a new instance with the given context  
 replacing the existing context.
 
+##### Parameters:
+
+- ***array*** `$context` - The context to add to all log messages.
+
 ---
 
 #### Method: LoggerWithContextInterface->withAddedContext
@@ -127,6 +131,10 @@ function withAddedContext(array $context) : self
 Returns a new instance with the given context  
 added to the existing context.
 
+##### Parameters:
+
+- ***array*** `$context` - The context to add to all log messages.
+
 ### Class: Corpus\Loggers\Interfaces\MultiLoggerInterface
 
 #### Method: MultiLoggerInterface->withAdditionalLoggers
@@ -160,6 +168,10 @@ function withContext(array $context) : self
 Returns a new instance with the given context  
 replacing the existing context.
 
+##### Parameters:
+
+- ***array*** `$context` - The context to add to all log messages.
+
 ---
 
 #### Method: WithContextInterface->withAddedContext
@@ -171,6 +183,10 @@ function withAddedContext(array $context) : self
 Returns a new instance with the given context  
 added to the existing context.
 
+##### Parameters:
+
+- ***array*** `$context` - The context to add to all log messages.
+
 ### Class: Corpus\Loggers\LoggerVerbosityFilter
 
 LoggerVerbosityFilter mutes log messages based on a given integer verbosity level.
@@ -240,6 +256,7 @@ The given context will be added to all log messages.
 
 - ***\Psr\Log\LoggerInterface*** `$logger` - The logger to delegate to.
 - ***array*** `$context` - The context to add to all log messages.
+- ***array*** `$context`
 
 ---
 
@@ -252,6 +269,10 @@ function withContext(array $context) : self
 Returns a new instance with the given context  
 replacing the existing context.
 
+##### Parameters:
+
+- ***array*** `$context` - The context to add to all log messages.
+
 ---
 
 #### Method: LoggerWithContext->withAddedContext
@@ -263,6 +284,10 @@ function withAddedContext(array $context) : self
 Returns a new instance with the given context  
 added to the existing context.
 
+##### Parameters:
+
+- ***array*** `$context` - The context to add to all log messages.
+
 ### Class: Corpus\Loggers\LogLevelFilter
 
 LogLevelFilter is a PSR Logger that filters logs based on the log level.
diff --git a/composer.json b/composer.json
index fb8c9a1..ebbcd2a 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,8 @@
         "corpus/coding-standard": "^0.8.0",
         "friendsofphp/php-cs-fixer": "^3.65",
         "rawr/phpunit-data-provider": "^3.3",
-        "corpus/recursive-require": "^1.2"
+        "corpus/recursive-require": "^1.2",
+        "phpstan/phpstan": "^2.1"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..15bd816
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,7 @@
+parameters:
+	level: 8
+	tmpDir: .phpstan-cache
+	paths:
+		- src
+	phpVersion: 70400
+	treatPhpDocTypesAsCertain: false
diff --git a/src/Interfaces/WithContextInterface.php b/src/Interfaces/WithContextInterface.php
index c28844f..7d303a2 100644
--- a/src/Interfaces/WithContextInterface.php
+++ b/src/Interfaces/WithContextInterface.php
@@ -7,12 +7,16 @@ interface WithContextInterface {
 	/**
 	 * Returns a new instance with the given context
 	 * replacing the existing context.
+	 *
+	 * @param mixed[] $context The context to add to all log messages.
 	 */
 	public function withContext( array $context ) : self;
 
 	/**
 	 * Returns a new instance with the given context
 	 * added to the existing context.
+	 *
+	 * @param mixed[] $context The context to add to all log messages.
 	 */
 	public function withAddedContext( array $context ) : self;
 
diff --git a/src/LoggerWithContext.php b/src/LoggerWithContext.php
index 45c4bf0..ac9d5d7 100644
--- a/src/LoggerWithContext.php
+++ b/src/LoggerWithContext.php
@@ -17,6 +17,7 @@ class LoggerWithContext implements LoggerWithContextInterface {
 
 	use LoggerTrait;
 
+	/** @var mixed[] */
 	private array $context;
 	private LoggerInterface $logger;
 
@@ -27,6 +28,7 @@ class LoggerWithContext implements LoggerWithContextInterface {
 	 *
 	 * @param LoggerInterface $logger  The logger to delegate to.
 	 * @param array           $context The context to add to all log messages.
+	 * @param mixed[]         $context
 	 */
 	public function __construct( LoggerInterface $logger, array $context = [] ) {
 		$this->logger  = $logger;
diff --git a/src/MemoryLogger.php b/src/MemoryLogger.php
index 3f5b127..425b894 100644
--- a/src/MemoryLogger.php
+++ b/src/MemoryLogger.php
@@ -18,6 +18,7 @@ class MemoryLogger implements LoggerInterface {
 	public const KEY_MESSAGE = 'message';
 	public const KEY_CONTEXT = 'context';
 
+	/** @var array<array{level:mixed,message:string,context:mixed[]}> */
 	private array $logs = [];
 
 	/**
@@ -37,6 +38,7 @@ public function log( $level, $message, array $context = [] ) : void {
 	 * - MemoryLogger::KEY_MESSAGE : The log message
 	 * - MemoryLogger::KEY_CONTEXT : The log context
 	 *
+	 * @phpstan-return array<array{level:mixed,message:string,context:mixed[]}>
 	 * @return array[]
 	 */
 	public function getLogs() : array {
@@ -58,6 +60,7 @@ public function clearLogs() : void {
 	 * @param mixed   $level   The log level
 	 * @param string  $message The log message
 	 * @param mixed[] $context The log context
+	 * @return array{level:mixed,message:string,context:mixed[]}
 	 * @mddoc-ignore
 	 */
 	public static function makeLogRecord( $level, $message, array $context = [] ) : array {
diff --git a/src/StreamResourceLogger.php b/src/StreamResourceLogger.php
index b9ef332..40b7280 100644
--- a/src/StreamResourceLogger.php
+++ b/src/StreamResourceLogger.php
@@ -49,7 +49,7 @@ public function log( $level, $message, array $context = [] ) : void {
 			$this->stream,
 			"%s %9s: %s\n",
 			date('c'),
-			$level,
+			(string)$level,
 			is_string($message) ? $message : var_export($message, true)
 		);