diff --git a/lib/smarty/libs/Smarty.class.php b/lib/smarty/libs/Smarty.class.php
index 97706e2a..071cc94f 100644
--- a/lib/smarty/libs/Smarty.class.php
+++ b/lib/smarty/libs/Smarty.class.php
@@ -107,7 +107,7 @@ class Smarty extends Smarty_Internal_TemplateBase
     /**
      * smarty version
      */
-    const SMARTY_VERSION = '4.5.4';
+    const SMARTY_VERSION = '4.5.5';
     /**
      * define variable scopes
      */
@@ -1036,11 +1036,11 @@ class Smarty extends Smarty_Internal_TemplateBase
     /**
      * Get unique template id
      *
-     * @param string                    $template_name
-     * @param null|mixed                $cache_id
-     * @param null|mixed                $compile_id
-     * @param null                      $caching
-     * @param \Smarty_Internal_Template $template
+     * @param string                         $template_name
+     * @param null|mixed                     $cache_id
+     * @param null|mixed                     $compile_id
+     * @param null                           $caching
+     * @param \Smarty_Internal_Template|null $template
      *
      * @return string
      * @throws \SmartyException
@@ -1050,7 +1050,7 @@ class Smarty extends Smarty_Internal_TemplateBase
         $cache_id = null,
         $compile_id = null,
         $caching = null,
-        Smarty_Internal_Template $template = null
+        ?Smarty_Internal_Template $template = null
     ) {
         $template_name = (strpos($template_name, ':') === false) ? "{$this->default_resource_type}:{$template_name}" :
             $template_name;
diff --git a/lib/smarty/libs/sysplugins/smarty_cacheresource.php b/lib/smarty/libs/sysplugins/smarty_cacheresource.php
index db68f9bf..8a801b4d 100644
--- a/lib/smarty/libs/sysplugins/smarty_cacheresource.php
+++ b/lib/smarty/libs/sysplugins/smarty_cacheresource.php
@@ -44,15 +44,15 @@ abstract class Smarty_CacheResource
     /**
      * Read the cached template and process header
      *
-     * @param Smarty_Internal_Template $_template template object
-     * @param Smarty_Template_Cached   $cached    cached object
-     * @param boolean                  $update    flag if called because cache update
+     * @param Smarty_Internal_Template    $_template template object
+     * @param Smarty_Template_Cached|null $cached    cached object
+     * @param boolean                     $update    flag if called because cache update
      *
      * @return boolean true or false if the cached content does not exist
      */
     abstract public function process(
         Smarty_Internal_Template $_template,
-        Smarty_Template_Cached $cached = null,
+        ?Smarty_Template_Cached $cached = null,
         $update = false
     );
 
diff --git a/lib/smarty/libs/sysplugins/smarty_cacheresource_custom.php b/lib/smarty/libs/sysplugins/smarty_cacheresource_custom.php
index 68ad1128..af227481 100644
--- a/lib/smarty/libs/sysplugins/smarty_cacheresource_custom.php
+++ b/lib/smarty/libs/sysplugins/smarty_cacheresource_custom.php
@@ -124,15 +124,15 @@ abstract class Smarty_CacheResource_Custom extends Smarty_CacheResource
     /**
      * Read the cached template and process the header
      *
-     * @param \Smarty_Internal_Template $_smarty_tpl do not change variable name, is used by compiled template
-     * @param Smarty_Template_Cached    $cached      cached object
-     * @param boolean                   $update      flag if called because cache update
+     * @param \Smarty_Internal_Template   $_smarty_tpl do not change variable name, is used by compiled template
+     * @param Smarty_Template_Cached|null $cached      cached object
+     * @param boolean                     $update      flag if called because cache update
      *
      * @return boolean                 true or false if the cached content does not exist
      */
     public function process(
         Smarty_Internal_Template $_smarty_tpl,
-        Smarty_Template_Cached $cached = null,
+        ?Smarty_Template_Cached $cached = null,
         $update = false
     ) {
         if (!$cached) {
diff --git a/lib/smarty/libs/sysplugins/smarty_cacheresource_keyvaluestore.php b/lib/smarty/libs/sysplugins/smarty_cacheresource_keyvaluestore.php
index 4b1c0f6d..92c699eb 100644
--- a/lib/smarty/libs/sysplugins/smarty_cacheresource_keyvaluestore.php
+++ b/lib/smarty/libs/sysplugins/smarty_cacheresource_keyvaluestore.php
@@ -88,15 +88,15 @@ abstract class Smarty_CacheResource_KeyValueStore extends Smarty_CacheResource
     /**
      * Read the cached template and process the header
      *
-     * @param \Smarty_Internal_Template $_smarty_tpl do not change variable name, is used by compiled template
-     * @param Smarty_Template_Cached    $cached      cached object
-     * @param boolean                   $update      flag if called because cache update
+     * @param \Smarty_Internal_Template   $_smarty_tpl do not change variable name, is used by compiled template
+     * @param Smarty_Template_Cached|null $cached      cached object
+     * @param boolean                     $update      flag if called because cache update
      *
      * @return boolean                 true or false if the cached content does not exist
      */
     public function process(
         Smarty_Internal_Template $_smarty_tpl,
-        Smarty_Template_Cached $cached = null,
+        ?Smarty_Template_Cached $cached = null,
         $update = false
     ) {
         if (!$cached) {
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_cacheresource_file.php b/lib/smarty/libs/sysplugins/smarty_internal_cacheresource_file.php
index c77ae9e1..9d64c5a3 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_cacheresource_file.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_cacheresource_file.php
@@ -88,15 +88,15 @@ class Smarty_Internal_CacheResource_File extends Smarty_CacheResource
     /**
      * Read the cached template and process its header
      *
-     * @param \Smarty_Internal_Template $_smarty_tpl do not change variable name, is used by compiled template
-     * @param Smarty_Template_Cached    $cached      cached object
-     * @param bool                      $update      flag if called because cache update
+     * @param \Smarty_Internal_Template   $_smarty_tpl do not change variable name, is used by compiled template
+     * @param Smarty_Template_Cached|null $cached      cached object
+     * @param bool                        $update      flag if called because cache update
      *
      * @return boolean true or false if the cached content does not exist
      */
     public function process(
         Smarty_Internal_Template $_smarty_tpl,
-        Smarty_Template_Cached $cached = null,
+        ?Smarty_Template_Cached $cached = null,
         $update = false
     ) {
         $_smarty_tpl->cached->valid = false;
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_data.php b/lib/smarty/libs/sysplugins/smarty_internal_data.php
index 1b64185b..c7ce6159 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_data.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_data.php
@@ -190,7 +190,7 @@ abstract class Smarty_Internal_Data
      *
      * @return mixed variable value or or array of variables
      */
-    public function getTemplateVars($varName = null, Smarty_Internal_Data $_ptr = null, $searchParents = true)
+    public function getTemplateVars($varName = null, ?Smarty_Internal_Data $_ptr = null, $searchParents = true)
     {
         return $this->ext->getTemplateVars->getTemplateVars($this, $varName, $_ptr, $searchParents);
     }
@@ -200,7 +200,7 @@ abstract class Smarty_Internal_Data
      *
      * @param \Smarty_Internal_Data|null $data
      */
-    public function _mergeVars(Smarty_Internal_Data $data = null)
+    public function _mergeVars(?Smarty_Internal_Data $data = null)
     {
         if (isset($data)) {
             if (!empty($this->tpl_vars)) {
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_method_createdata.php b/lib/smarty/libs/sysplugins/smarty_internal_method_createdata.php
index c684c087..59027203 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_method_createdata.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_method_createdata.php
@@ -24,14 +24,14 @@ class Smarty_Internal_Method_CreateData
      * @api  Smarty::createData()
      * @link https://www.smarty.net/docs/en/api.create.data.tpl
      *
-     * @param \Smarty_Internal_TemplateBase|\Smarty_Internal_Template|\Smarty      $obj
-     * @param \Smarty_Internal_Template|\Smarty_Internal_Data|\Smarty_Data|\Smarty $parent next higher level of Smarty
-     *                                                                                     variables
-     * @param string                                                               $name   optional data block name
+     * @param \Smarty_Internal_TemplateBase|\Smarty_Internal_Template|\Smarty           $obj
+     * @param \Smarty_Internal_Template|\Smarty_Internal_Data|\Smarty_Data|\Smarty|null $parent next higher level of Smarty
+     *                                                                                          variables
+     * @param string                                                                    $name   optional data block name
      *
      * @return \Smarty_Data data object
      */
-    public function createData(Smarty_Internal_TemplateBase $obj, Smarty_Internal_Data $parent = null, $name = null)
+    public function createData(Smarty_Internal_TemplateBase $obj, ?Smarty_Internal_Data $parent = null, $name = null)
     {
         /* @var Smarty $smarty */
         $smarty = $obj->_getSmartyObj();
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_method_gettemplatevars.php b/lib/smarty/libs/sysplugins/smarty_internal_method_gettemplatevars.php
index 0470785b..bac17f5b 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_method_gettemplatevars.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_method_gettemplatevars.php
@@ -24,17 +24,17 @@ class Smarty_Internal_Method_GetTemplateVars
      * @api  Smarty::getTemplateVars()
      * @link https://www.smarty.net/docs/en/api.get.template.vars.tpl
      *
-     * @param \Smarty_Internal_Data|\Smarty_Internal_Template|\Smarty $data
-     * @param string                                                  $varName       variable name or null
-     * @param \Smarty_Internal_Data|\Smarty_Internal_Template|\Smarty $_ptr          optional pointer to data object
-     * @param bool                                                    $searchParents include parent templates?
+     * @param \Smarty_Internal_Data|\Smarty_Internal_Template|\Smarty      $data
+     * @param string                                                       $varName       variable name or null
+     * @param \Smarty_Internal_Data|\Smarty_Internal_Template|\Smarty|null $_ptr          optional pointer to data object
+     * @param bool                                                         $searchParents include parent templates?
      *
      * @return mixed variable value or or array of variables
      */
     public function getTemplateVars(
         Smarty_Internal_Data $data,
         $varName = null,
-        Smarty_Internal_Data $_ptr = null,
+        ?Smarty_Internal_Data $_ptr = null,
         $searchParents = true
     ) {
         if (isset($varName)) {
@@ -87,7 +87,7 @@ class Smarty_Internal_Method_GetTemplateVars
     public function _getVariable(
         Smarty_Internal_Data $data,
         $varName,
-        Smarty_Internal_Data $_ptr = null,
+        ?Smarty_Internal_Data $_ptr = null,
         $searchParents = true,
         $errorEnable = true
     ) {
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_resource_eval.php b/lib/smarty/libs/sysplugins/smarty_internal_resource_eval.php
index 3b552a58..ba306444 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_resource_eval.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_resource_eval.php
@@ -22,11 +22,11 @@ class Smarty_Internal_Resource_Eval extends Smarty_Resource_Recompiled
      * populate Source Object with meta data from Resource
      *
      * @param Smarty_Template_Source   $source    source object
-     * @param Smarty_Internal_Template $_template template object
+     * @param Smarty_Internal_Template|null $_template template object
      *
      * @return void
      */
-    public function populate(Smarty_Template_Source $source, Smarty_Internal_Template $_template = null)
+    public function populate(Smarty_Template_Source $source, ?Smarty_Internal_Template $_template = null)
     {
         $source->uid = $source->filepath = sha1($source->name);
         $source->timestamp = $source->exists = true;
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_resource_extends.php b/lib/smarty/libs/sysplugins/smarty_internal_resource_extends.php
index 80946932..2b225324 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_resource_extends.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_resource_extends.php
@@ -28,11 +28,11 @@ class Smarty_Internal_Resource_Extends extends Smarty_Resource
      * populate Source Object with meta data from Resource
      *
      * @param Smarty_Template_Source   $source    source object
-     * @param Smarty_Internal_Template $_template template object
+     * @param Smarty_Internal_Template|null $_template template object
      *
      * @throws SmartyException
      */
-    public function populate(Smarty_Template_Source $source, Smarty_Internal_Template $_template = null)
+    public function populate(Smarty_Template_Source $source, ?Smarty_Internal_Template $_template = null)
     {
         $uid = '';
         $sources = array();
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_resource_file.php b/lib/smarty/libs/sysplugins/smarty_internal_resource_file.php
index ae206067..fd0befd5 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_resource_file.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_resource_file.php
@@ -21,11 +21,11 @@ class Smarty_Internal_Resource_File extends Smarty_Resource
      * populate Source Object with meta data from Resource
      *
      * @param Smarty_Template_Source   $source    source object
-     * @param Smarty_Internal_Template $_template template object
+     * @param Smarty_Internal_Template|null $_template template object
      *
      * @throws \SmartyException
      */
-    public function populate(Smarty_Template_Source $source, Smarty_Internal_Template $_template = null)
+    public function populate(Smarty_Template_Source $source, ?Smarty_Internal_Template $_template = null)
     {
         $source->filepath = $this->buildFilepath($source, $_template);
         if ($source->filepath !== false) {
@@ -93,12 +93,12 @@ class Smarty_Internal_Resource_File extends Smarty_Resource
      * build template filepath by traversing the template_dir array
      *
      * @param Smarty_Template_Source   $source    source object
-     * @param Smarty_Internal_Template $_template template object
+     * @param Smarty_Internal_Template|null $_template template object
      *
      * @return string fully qualified filepath
      * @throws SmartyException
      */
-    protected function buildFilepath(Smarty_Template_Source $source, Smarty_Internal_Template $_template = null)
+    protected function buildFilepath(Smarty_Template_Source $source, ?Smarty_Internal_Template $_template = null)
     {
         $file = $source->name;
         // absolute file ?
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_resource_stream.php b/lib/smarty/libs/sysplugins/smarty_internal_resource_stream.php
index 5f020349..632e58f4 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_resource_stream.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_resource_stream.php
@@ -23,11 +23,11 @@ class Smarty_Internal_Resource_Stream extends Smarty_Resource_Recompiled
      * populate Source Object with meta data from Resource
      *
      * @param Smarty_Template_Source   $source    source object
-     * @param Smarty_Internal_Template $_template template object
+     * @param Smarty_Internal_Template|null $_template template object
      *
      * @return void
      */
-    public function populate(Smarty_Template_Source $source, Smarty_Internal_Template $_template = null)
+    public function populate(Smarty_Template_Source $source, ?Smarty_Internal_Template $_template = null)
     {
         if (strpos($source->resource, '://') !== false) {
             $source->filepath = $source->resource;
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_resource_string.php b/lib/smarty/libs/sysplugins/smarty_internal_resource_string.php
index 3fecbb7e..7b69faa9 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_resource_string.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_resource_string.php
@@ -22,11 +22,11 @@ class Smarty_Internal_Resource_String extends Smarty_Resource
      * populate Source Object with meta data from Resource
      *
      * @param Smarty_Template_Source   $source    source object
-     * @param Smarty_Internal_Template $_template template object
+     * @param Smarty_Internal_Template|null $_template template object
      *
      * @return void
      */
-    public function populate(Smarty_Template_Source $source, Smarty_Internal_Template $_template = null)
+    public function populate(Smarty_Template_Source $source, ?Smarty_Internal_Template $_template = null)
     {
         $source->uid = $source->filepath = sha1($source->name . $source->smarty->_joined_template_dir);
         $source->timestamp = $source->exists = true;
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_runtime_codeframe.php b/lib/smarty/libs/sysplugins/smarty_internal_runtime_codeframe.php
index d0ca751e..37a88109 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_runtime_codeframe.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_runtime_codeframe.php
@@ -17,11 +17,11 @@ class Smarty_Internal_Runtime_CodeFrame
     /**
      * Create code frame for compiled and cached templates
      *
-     * @param Smarty_Internal_Template              $_template
-     * @param string                                $content   optional template content
-     * @param string                                $functions compiled template function and block code
-     * @param bool                                  $cache     flag for cache file
-     * @param \Smarty_Internal_TemplateCompilerBase $compiler
+     * @param Smarty_Internal_Template                   $_template
+     * @param string                                     $content   optional template content
+     * @param string                                     $functions compiled template function and block code
+     * @param bool                                       $cache     flag for cache file
+     * @param \Smarty_Internal_TemplateCompilerBase|null $compiler
      *
      * @return string
      */
@@ -30,7 +30,7 @@ class Smarty_Internal_Runtime_CodeFrame
         $content = '',
         $functions = '',
         $cache = false,
-        Smarty_Internal_TemplateCompilerBase $compiler = null
+        ?Smarty_Internal_TemplateCompilerBase $compiler = null
     ) {
         // build property code
         $properties[ 'version' ] = Smarty::SMARTY_VERSION;
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_runtime_inheritance.php b/lib/smarty/libs/sysplugins/smarty_internal_runtime_inheritance.php
index 8f7f02d5..52faf5a4 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_runtime_inheritance.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_runtime_inheritance.php
@@ -168,7 +168,7 @@ class Smarty_Internal_Runtime_Inheritance
     public function process(
         Smarty_Internal_Template $tpl,
         Smarty_Internal_Block $block,
-        Smarty_Internal_Block $parent = null
+        ?Smarty_Internal_Block $parent = null
     ) {
         if ($block->hide && !isset($block->child)) {
             return;
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_template.php b/lib/smarty/libs/sysplugins/smarty_internal_template.php
index 72d1d52e..93731a5d 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_template.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_template.php
@@ -149,7 +149,7 @@ class Smarty_Internal_Template extends Smarty_Internal_TemplateBase
     public function __construct(
         $template_resource,
         Smarty $smarty,
-        Smarty_Internal_Data $_parent = null,
+        ?Smarty_Internal_Data $_parent = null,
         $_cache_id = null,
         $_compile_id = null,
         $_caching = null,
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_templatecompilerbase.php b/lib/smarty/libs/sysplugins/smarty_internal_templatecompilerbase.php
index 03797f7f..254e1bf2 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_templatecompilerbase.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_templatecompilerbase.php
@@ -386,7 +386,7 @@ abstract class Smarty_Internal_TemplateCompilerBase
     public function compileTemplate(
         Smarty_Internal_Template $template,
         $nocache = null,
-        Smarty_Internal_TemplateCompilerBase $parent_compiler = null
+        ?Smarty_Internal_TemplateCompilerBase $parent_compiler = null
     ) {
         // get code frame of compiled template
         $_compiled_code = $template->smarty->ext->_codeFrame->create(
@@ -407,9 +407,9 @@ abstract class Smarty_Internal_TemplateCompilerBase
     /**
      * Compile template source and run optional post filter
      *
-     * @param \Smarty_Internal_Template             $template
-     * @param null|bool                             $nocache flag if template must be compiled in nocache mode
-     * @param \Smarty_Internal_TemplateCompilerBase $parent_compiler
+     * @param \Smarty_Internal_Template                  $template
+     * @param null|bool                                  $nocache flag if template must be compiled in nocache mode
+     * @param \Smarty_Internal_TemplateCompilerBase|null $parent_compiler
      *
      * @return string
      * @throws \Exception
@@ -417,7 +417,7 @@ abstract class Smarty_Internal_TemplateCompilerBase
     public function compileTemplateSource(
         Smarty_Internal_Template $template,
         $nocache = null,
-        Smarty_Internal_TemplateCompilerBase $parent_compiler = null
+        ?Smarty_Internal_TemplateCompilerBase $parent_compiler = null
     ) {
         try {
             // save template object in compiler class
diff --git a/lib/smarty/libs/sysplugins/smarty_resource.php b/lib/smarty/libs/sysplugins/smarty_resource.php
index 3c43a9f4..fe775117 100644
--- a/lib/smarty/libs/sysplugins/smarty_resource.php
+++ b/lib/smarty/libs/sysplugins/smarty_resource.php
@@ -165,16 +165,16 @@ abstract class Smarty_Resource
      * wrapper for backward compatibility to versions < 3.1.22
      * Either [$_template] or [$smarty, $template_resource] must be specified
      *
-     * @param Smarty_Internal_Template $_template         template object
-     * @param Smarty                   $smarty            smarty object
-     * @param string                   $template_resource resource identifier
+     * @param Smarty_Internal_Template|null $_template         template object
+     * @param Smarty|null                   $smarty            smarty object
+     * @param string                        $template_resource resource identifier
      *
      * @return \Smarty_Template_Source Source Object
      * @throws \SmartyException
      */
     public static function source(
-        Smarty_Internal_Template $_template = null,
-        Smarty $smarty = null,
+        ?Smarty_Internal_Template $_template = null,
+        ?Smarty $smarty = null,
         $template_resource = null
     ) {
         return Smarty_Template_Source::load($_template, $smarty, $template_resource);
@@ -193,10 +193,10 @@ abstract class Smarty_Resource
     /**
      * populate Source Object with meta data from Resource
      *
-     * @param Smarty_Template_Source   $source    source object
-     * @param Smarty_Internal_Template $_template template object
+     * @param Smarty_Template_Source        $source    source object
+     * @param Smarty_Internal_Template|null $_template template object
      */
-    abstract public function populate(Smarty_Template_Source $source, Smarty_Internal_Template $_template = null);
+    abstract public function populate(Smarty_Template_Source $source, ?Smarty_Internal_Template $_template = null);
 
     /**
      * populate Source Object with timestamp and exists from Resource
diff --git a/lib/smarty/libs/sysplugins/smarty_resource_custom.php b/lib/smarty/libs/sysplugins/smarty_resource_custom.php
index 191fa7c9..a73f559c 100644
--- a/lib/smarty/libs/sysplugins/smarty_resource_custom.php
+++ b/lib/smarty/libs/sysplugins/smarty_resource_custom.php
@@ -42,10 +42,10 @@ abstract class Smarty_Resource_Custom extends Smarty_Resource
     /**
      * populate Source Object with meta data from Resource
      *
-     * @param Smarty_Template_Source   $source    source object
-     * @param Smarty_Internal_Template $_template template object
+     * @param Smarty_Template_Source        $source    source object
+     * @param Smarty_Internal_Template|null $_template template object
      */
-    public function populate(Smarty_Template_Source $source, Smarty_Internal_Template $_template = null)
+    public function populate(Smarty_Template_Source $source, ?Smarty_Internal_Template $_template = null)
     {
         $source->filepath = $source->type . ':' . $this->generateSafeName($source->name);
         $source->uid = sha1($source->type . ':' . $source->name);
diff --git a/lib/smarty/libs/sysplugins/smarty_template_config.php b/lib/smarty/libs/sysplugins/smarty_template_config.php
index 850ae32e..66297304 100644
--- a/lib/smarty/libs/sysplugins/smarty_template_config.php
+++ b/lib/smarty/libs/sysplugins/smarty_template_config.php
@@ -63,16 +63,16 @@ class Smarty_Template_Config extends Smarty_Template_Source
      * initialize Source Object for given resource
      * Either [$_template] or [$smarty, $template_resource] must be specified
      *
-     * @param Smarty_Internal_Template $_template         template object
-     * @param Smarty                   $smarty            smarty object
-     * @param string                   $template_resource resource identifier
+     * @param Smarty_Internal_Template|null $_template         template object
+     * @param Smarty|null                   $smarty            smarty object
+     * @param string                        $template_resource resource identifier
      *
      * @return Smarty_Template_Config Source Object
      * @throws SmartyException
      */
     public static function load(
-        Smarty_Internal_Template $_template = null,
-        Smarty $smarty = null,
+        ?Smarty_Internal_Template $_template = null,
+        ?Smarty $smarty = null,
         $template_resource = null
     ) {
         static $_incompatible_resources = array('extends' => true, 'php' => true);
diff --git a/lib/smarty/libs/sysplugins/smarty_template_source.php b/lib/smarty/libs/sysplugins/smarty_template_source.php
index 16b47f23..06053a69 100644
--- a/lib/smarty/libs/sysplugins/smarty_template_source.php
+++ b/lib/smarty/libs/sysplugins/smarty_template_source.php
@@ -148,16 +148,16 @@ class Smarty_Template_Source
      * initialize Source Object for given resource
      * Either [$_template] or [$smarty, $template_resource] must be specified
      *
-     * @param Smarty_Internal_Template $_template         template object
-     * @param Smarty                   $smarty            smarty object
-     * @param string                   $template_resource resource identifier
+     * @param Smarty_Internal_Template|null $_template         template object
+     * @param Smarty|null                   $smarty            smarty object
+     * @param string                        $template_resource resource identifier
      *
      * @return Smarty_Template_Source Source Object
      * @throws SmartyException
      */
     public static function load(
-        Smarty_Internal_Template $_template = null,
-        Smarty $smarty = null,
+        ?Smarty_Internal_Template $_template = null,
+        ?Smarty $smarty = null,
         $template_resource = null
     ) {
         if ($_template) {
diff --git a/lib/smarty/libs/sysplugins/smartycompilerexception.php b/lib/smarty/libs/sysplugins/smartycompilerexception.php
index 0a0a3235..755749c2 100644
--- a/lib/smarty/libs/sysplugins/smartycompilerexception.php
+++ b/lib/smarty/libs/sysplugins/smartycompilerexception.php
@@ -21,7 +21,7 @@ class SmartyCompilerException extends SmartyException
         int $code = 0,
         ?string $filename = null,
         ?int $line = null,
-        Throwable $previous = null
+        ?Throwable $previous = null
     ) {
         parent::__construct($message, $code, $previous);
 
diff --git a/lib/smarty/smarty_version b/lib/smarty/smarty_version
index 29e3d2d5..d9875c8b 100644
--- a/lib/smarty/smarty_version
+++ b/lib/smarty/smarty_version
@@ -1,5 +1,5 @@
 $Id$
 
-Smarty version: 4.5.4  (released: 2024/08/14)
+Smarty version: 4.5.5  (released: 2024/11/21)
 
-https://github.com/smarty-php/smarty/archive/refs/tags/v4.5.4.tar.gz
+https://github.com/smarty-php/smarty/archive/refs/tags/v4.5.5.tar.gz