diff --git a/.phpstan.neon b/.phpstan.neon
deleted file mode 100644
index 50e0daa..0000000
--- a/.phpstan.neon
+++ /dev/null
@@ -1,7 +0,0 @@
-parameters:
-    ignoreErrors:
-        # Ignore documentElement errors:
-        - '# on DOMElement|null#'
-
-includes:
-- vendor/phpstan/phpstan-phpunit/extension.neon
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 2798861..fc80ec5 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
         "ext-xsl" : "*",
         "ext-dom" : "*",
         "ext-intl" : "*",
-        "psr/simple-cache": "^1.0"
+        "psr/simple-cache": "^3.0"
     },
     "require-dev" : {
         "phpunit/phpunit": "^9",
@@ -25,5 +25,13 @@
         "psr-4" : {
             "Genkgo\\Xsl\\" : ["test"]
         }
+    },
+    "scripts": {
+        "test": [
+            "./vendor/bin/phpunit -c phpunit.xml",
+            "./vendor/bin/phpstan analyse -l 5 src",
+            "./vendor/bin/phpstan analyse -l 7 test",
+            "./vendor/bin/php-cs-fixer fix --dry-run --verbose --config .php-cs-fixer.dist.php ./src ./test"
+        ]
     }
 }
diff --git a/src/Cache/ArrayCache.php b/src/Cache/ArrayCache.php
index 382c2b3..05c0dd2 100644
--- a/src/Cache/ArrayCache.php
+++ b/src/Cache/ArrayCache.php
@@ -7,17 +7,9 @@
 
 final class ArrayCache implements CacheInterface
 {
-    /**
-     * @var array
-     */
-    private $memory = [];
-
-    /**
-     * @param string $key
-     * @param mixed $default
-     * @return mixed
-     */
-    public function get($key, $default = null)
+    private array $memory = [];
+
+    public function get(string $key, mixed $default = null): mixed
     {
         if (isset($this->memory[$key])) {
             return $this->getNonExpiredCacheOrDefault($this->memory[$key], $default);
@@ -26,13 +18,7 @@ public function get($key, $default = null)
         return $default;
     }
 
-    /**
-     * @param string $key
-     * @param mixed $value
-     * @param int|null|\DateInterval $ttl
-     * @return bool
-     */
-    public function set($key, $value, $ttl = null)
+    public function set(string $key, mixed $value, null|int|\DateInterval $ttl = null): bool
     {
         $expires = null;
 
@@ -47,43 +33,26 @@ public function set($key, $value, $ttl = null)
         return true;
     }
 
-    /**
-     * @param string $key
-     * @return bool
-     */
-    public function delete($key)
+    public function delete(string $key): bool
     {
         unset($this->memory[$key]);
         return true;
     }
 
-    /**
-     * @return bool
-     */
-    public function clear()
+    public function clear(): bool
     {
         $this->memory = [];
         return true;
     }
 
-    /**
-     * @param iterable $keys
-     * @param mixed $default
-     * @return iterable
-     */
-    public function getMultiple($keys, $default = null)
+    public function getMultiple(iterable $keys, mixed $default = null): iterable
     {
-        foreach (\array_keys($this->memory) as $key) {
-            yield $this->get($key, $default);
+        foreach ($keys as $key) {
+            yield $key => $this->get($key, $default);
         }
     }
 
-    /**
-     * @param iterable $values
-     * @param null|int|\DateInterval $ttl
-     * @return bool
-     */
-    public function setMultiple($values, $ttl = null)
+    public function setMultiple(iterable $values, null|int|\DateInterval $ttl = null): bool
     {
         foreach ($values as $key => $value) {
             $this->set($key, $value, $ttl);
@@ -92,11 +61,7 @@ public function setMultiple($values, $ttl = null)
         return true;
     }
 
-    /**
-     * @param iterable $keys
-     * @return bool
-     */
-    public function deleteMultiple($keys)
+    public function deleteMultiple(iterable $keys): bool
     {
         foreach (\array_keys($this->memory) as $key) {
             $this->delete($key);
@@ -105,21 +70,12 @@ public function deleteMultiple($keys)
         return true;
     }
 
-    /**
-     * @param string $key
-     * @return bool
-     */
-    public function has($key)
+    public function has(string $key): bool
     {
         return isset($this->memory[$key]);
     }
 
-    /**
-     * @param array $keyData
-     * @param mixed|null $default
-     * @return mixed
-     */
-    private function getNonExpiredCacheOrDefault(array $keyData, $default = null)
+    private function getNonExpiredCacheOrDefault(array $keyData, mixed $default = null): mixed
     {
         [$value, $expires] = $keyData;
 
diff --git a/src/Cache/NullCache.php b/src/Cache/NullCache.php
index fa88b85..94919b4 100644
--- a/src/Cache/NullCache.php
+++ b/src/Cache/NullCache.php
@@ -7,78 +7,42 @@
 
 final class NullCache implements CacheInterface
 {
-    /**
-     * @param string $key
-     * @param mixed $default
-     * @return mixed
-     */
-    public function get($key, $default = null)
+    public function get(string $key, mixed $default = null): mixed
     {
         return $default;
     }
 
-    /**
-     * @param string $key
-     * @param mixed $value
-     * @param int|null $ttl
-     * @return bool
-     */
-    public function set($key, $value, $ttl = null)
+    public function set(string $key, mixed $value, null|int|\DateInterval $ttl = null): bool
     {
         return true;
     }
 
-    /**
-     * @param string $key
-     * @return bool
-     */
-    public function delete($key)
+    public function delete(string $key): bool
     {
         return true;
     }
 
-    /**
-     * @return bool
-     */
-    public function clear()
+    public function clear(): bool
     {
         return true;
     }
 
-    /**
-     * @param iterable $keys
-     * @param mixed $default
-     * @return iterable
-     */
-    public function getMultiple($keys, $default = null)
+    public function getMultiple(iterable $keys, mixed $default = null): iterable
     {
         return [];
     }
 
-    /**
-     * @param iterable $values
-     * @param null|int|\DateInterval $ttl
-     * @return bool
-     */
-    public function setMultiple($values, $ttl = null)
+    public function setMultiple(iterable $values, null|int|\DateInterval $ttl = null): bool
     {
         return true;
     }
 
-    /**
-     * @param iterable $keys
-     * @return bool
-     */
-    public function deleteMultiple($keys)
+    public function deleteMultiple(iterable $keys): bool
     {
         return true;
     }
 
-    /**
-     * @param string $key
-     * @return bool
-     */
-    public function has($key)
+    public function has(string $key): bool
     {
         return false;
     }