diff --git a/lib/smarty/libs/Smarty.class.php b/lib/smarty/libs/Smarty.class.php
index 5d2e3a4b..b285a99e 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 = '4.3.0';
+    const SMARTY_VERSION = '4.5.3';
     /**
      * define variable scopes
      */
@@ -1386,8 +1386,7 @@ class Smarty extends Smarty_Internal_TemplateBase
     }
 
     /**
-     * Activates PHP7 compatibility mode:
-     * - converts E_WARNINGS for "undefined array key" and "trying to read property of null" errors to E_NOTICE
+     * Mutes errors for "undefined index", "undefined array key" and "trying to read property of null".
      *
      * @void
      */
@@ -1396,7 +1395,7 @@ class Smarty extends Smarty_Internal_TemplateBase
     }
 
     /**
-     * Indicates if PHP7 compatibility mode is set.
+     * Indicates if Smarty will mute errors for "undefined index", "undefined array key" and "trying to read property of null".
      * @bool
      */
     public function isMutingUndefinedOrNullWarnings(): bool {
diff --git a/lib/smarty/libs/debug.tpl b/lib/smarty/libs/debug.tpl
index 4f82a582..cd932566 100644
--- a/lib/smarty/libs/debug.tpl
+++ b/lib/smarty/libs/debug.tpl
@@ -167,9 +167,7 @@
     </html>
 {/capture}
 <script type="text/javascript">
-    {$id = '__Smarty__'}
-    {if $display_mode}{$id = "$offset$template_name"|md5}{/if}
-    _smarty_console = window.open("", "console{$id}", "width=1024,height=600,left={$offset},top={$offset},resizable,scrollbars=yes");
+    _smarty_console = window.open("", "console{$targetWindow}", "width=1024,height=600,left={$offset},top={$offset},resizable,scrollbars=yes");
     _smarty_console.document.write("{$debug_output|escape:'javascript' nofilter}");
     _smarty_console.document.close();
 </script>
diff --git a/lib/smarty/libs/plugins/function.math.php b/lib/smarty/libs/plugins/function.math.php
index f9cf67fe..34912d23 100644
--- a/lib/smarty/libs/plugins/function.math.php
+++ b/lib/smarty/libs/plugins/function.math.php
@@ -67,7 +67,7 @@ function smarty_function_math($params, $template)
     $equation = preg_replace('/\s+/', '', $equation);
 
     // Adapted from https://www.php.net/manual/en/function.eval.php#107377
-    $number = '(?:\d+(?:[,.]\d+)?|pi|π)'; // What is a number
+    $number = '-?(?:\d+(?:[,.]\d+)?|pi|π)'; // What is a number
     $functionsOrVars = '((?:0x[a-fA-F0-9]+)|([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*))';
     $operators = '[,+\/*\^%-]'; // Allowed math operators
     $regexp = '/^(('.$number.'|'.$functionsOrVars.'|('.$functionsOrVars.'\s*\((?1)*\)|\((?1)*\)))(?:'.$operators.'(?1))?)+$/';
diff --git a/lib/smarty/libs/plugins/modifier.escape.php b/lib/smarty/libs/plugins/modifier.escape.php
index 11e44682..e168679c 100644
--- a/lib/smarty/libs/plugins/modifier.escape.php
+++ b/lib/smarty/libs/plugins/modifier.escape.php
@@ -115,7 +115,9 @@ function smarty_modifier_escape($string, $esc_type = 'html', $char_set = null, $
                     // see https://html.spec.whatwg.org/multipage/scripting.html#restrictions-for-contents-of-script-elements
                     '<!--' => '<\!--',
                     '<s'   => '<\s',
-                    '<S'   => '<\S'
+                    '<S'   => '<\S',
+	                "`" => "\\\\`",
+	                "\${" => "\\\\\\$\\{"
                 )
             );
         case 'mail':
diff --git a/lib/smarty/libs/plugins/modifier.implode.php b/lib/smarty/libs/plugins/modifier.implode.php
new file mode 100644
index 00000000..679d71d7
--- /dev/null
+++ b/lib/smarty/libs/plugins/modifier.implode.php
@@ -0,0 +1,15 @@
+<?php
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifier
+ */
+
+function smarty_modifier_implode($values, $separator = '')
+{
+	if (is_array($separator)) {
+		return implode((string) ($values ?? ''), (array) $separator);
+	}
+	return implode((string) ($separator ?? ''), (array) $values);
+}
diff --git a/lib/smarty/libs/plugins/modifier.truncate.php b/lib/smarty/libs/plugins/modifier.truncate.php
index 80dcdb53..d253e4a6 100644
--- a/lib/smarty/libs/plugins/modifier.truncate.php
+++ b/lib/smarty/libs/plugins/modifier.truncate.php
@@ -26,7 +26,7 @@
  */
 function smarty_modifier_truncate($string, $length = 80, $etc = '...', $break_words = false, $middle = false)
 {
-    if ($length === 0) {
+    if ($length === 0 || $string === null) {
         return '';
     }
     if (Smarty::$_MBSTRING) {
diff --git a/lib/smarty/libs/plugins/modifiercompiler.count_characters.php b/lib/smarty/libs/plugins/modifiercompiler.count_characters.php
index b5d97e27..7798cabc 100644
--- a/lib/smarty/libs/plugins/modifiercompiler.count_characters.php
+++ b/lib/smarty/libs/plugins/modifiercompiler.count_characters.php
@@ -25,8 +25,8 @@ function smarty_modifiercompiler_count_characters($params)
         return 'preg_match_all(\'/[^\s]/' . Smarty::$_UTF8_MODIFIER . '\',' . $params[ 0 ] . ', $tmp)';
     }
     if (Smarty::$_MBSTRING) {
-        return 'mb_strlen(' . $params[ 0 ] . ', \'' . addslashes(Smarty::$_CHARSET) . '\')';
+        return 'mb_strlen((string) ' . $params[ 0 ] . ', \'' . addslashes(Smarty::$_CHARSET) . '\')';
     }
     // no MBString fallback
-    return 'strlen(' . $params[ 0 ] . ')';
+    return 'strlen((string) ' . $params[ 0 ] . ')';
 }
diff --git a/lib/smarty/libs/plugins/modifiercompiler.count_words.php b/lib/smarty/libs/plugins/modifiercompiler.count_words.php
index cf2e5022..48a3daa1 100644
--- a/lib/smarty/libs/plugins/modifiercompiler.count_words.php
+++ b/lib/smarty/libs/plugins/modifiercompiler.count_words.php
@@ -27,5 +27,5 @@ function smarty_modifiercompiler_count_words($params)
                $params[ 0 ] . ', $tmp)';
     }
     // no MBString fallback
-    return 'str_word_count(' . $params[ 0 ] . ')';
+    return 'str_word_count((string) ' . $params[ 0 ] . ')';
 }
diff --git a/lib/smarty/libs/plugins/modifiercompiler.escape.php b/lib/smarty/libs/plugins/modifiercompiler.escape.php
index 602c3dbf..21b1b4c2 100644
--- a/lib/smarty/libs/plugins/modifiercompiler.escape.php
+++ b/lib/smarty/libs/plugins/modifiercompiler.escape.php
@@ -64,7 +64,9 @@ function smarty_modifiercompiler_escape($params, Smarty_Internal_TemplateCompile
                 // see https://html.spec.whatwg.org/multipage/scripting.html#restrictions-for-contents-of-script-elements
                 return 'strtr((string)' .
                        $params[ 0 ] .
-                       ', array("\\\\" => "\\\\\\\\", "\'" => "\\\\\'", "\"" => "\\\\\"", "\\r" => "\\\\r", "\\n" => "\\\n", "</" => "<\/", "<!--" => "<\!--", "<s" => "<\s", "<S" => "<\S" ))';
+                       ', array("\\\\" => "\\\\\\\\", "\'" => "\\\\\'", "\"" => "\\\\\"", "\\r" => "\\\\r", 
+                       "\\n" => "\\\n", "</" => "<\/", "<!--" => "<\!--", "<s" => "<\s", "<S" => "<\S",
+                       "`" => "\\\\`", "\${" => "\\\\\\$\\{"))';
         }
     } catch (SmartyException $e) {
         // pass through to regular plugin fallback
diff --git a/lib/smarty/libs/plugins/modifiercompiler.json_encode.php b/lib/smarty/libs/plugins/modifiercompiler.json_encode.php
new file mode 100644
index 00000000..629277f2
--- /dev/null
+++ b/lib/smarty/libs/plugins/modifiercompiler.json_encode.php
@@ -0,0 +1,11 @@
+<?php
+
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifierCompiler
+ */
+function smarty_modifiercompiler_json_encode($params) {
+	return 'json_encode(' . $params[0] . (isset($params[1]) ? ', (int) ' . $params[1] : '') . ')';
+}
diff --git a/lib/smarty/libs/plugins/modifiercompiler.lower.php b/lib/smarty/libs/plugins/modifiercompiler.lower.php
index ac9cc39d..4144e561 100644
--- a/lib/smarty/libs/plugins/modifiercompiler.lower.php
+++ b/lib/smarty/libs/plugins/modifiercompiler.lower.php
@@ -22,8 +22,8 @@
 function smarty_modifiercompiler_lower($params)
 {
     if (Smarty::$_MBSTRING) {
-        return 'mb_strtolower(' . $params[ 0 ] . ', \'' . addslashes(Smarty::$_CHARSET) . '\')';
+        return 'mb_strtolower((string) ' . $params[ 0 ] . ', \'' . addslashes(Smarty::$_CHARSET) . '\')';
     }
     // no MBString fallback
-    return 'strtolower(' . $params[ 0 ] . ')';
+    return 'strtolower((string) ' . $params[ 0 ] . ')';
 }
diff --git a/lib/smarty/libs/plugins/modifiercompiler.strip_tags.php b/lib/smarty/libs/plugins/modifiercompiler.strip_tags.php
index bd866a61..fd6cc725 100644
--- a/lib/smarty/libs/plugins/modifiercompiler.strip_tags.php
+++ b/lib/smarty/libs/plugins/modifiercompiler.strip_tags.php
@@ -21,7 +21,7 @@
 function smarty_modifiercompiler_strip_tags($params)
 {
     if (!isset($params[ 1 ]) || $params[ 1 ] === true || trim($params[ 1 ], '"') === 'true') {
-        return "preg_replace('!<[^>]*?>!', ' ', {$params[0]} ?: '')";
+        return "preg_replace('!<[^>]*?>!', ' ', (string) {$params[0]})";
     } else {
         return 'strip_tags((string) ' . $params[ 0 ] . ')';
     }
diff --git a/lib/smarty/libs/plugins/modifiercompiler.substr.php b/lib/smarty/libs/plugins/modifiercompiler.substr.php
new file mode 100644
index 00000000..17721f52
--- /dev/null
+++ b/lib/smarty/libs/plugins/modifiercompiler.substr.php
@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifierCompiler
+ */
+function smarty_modifiercompiler_substr($params) {
+	return 'substr((string) ' . $params[0] . ', (int) ' . $params[1] .
+		(isset($params[2]) ? ', (int) ' . $params[2] : '') . ')';
+}
diff --git a/lib/smarty/libs/plugins/modifiercompiler.upper.php b/lib/smarty/libs/plugins/modifiercompiler.upper.php
index 31a90a05..96030518 100644
--- a/lib/smarty/libs/plugins/modifiercompiler.upper.php
+++ b/lib/smarty/libs/plugins/modifiercompiler.upper.php
@@ -21,8 +21,8 @@
 function smarty_modifiercompiler_upper($params)
 {
     if (Smarty::$_MBSTRING) {
-        return 'mb_strtoupper(' . $params[ 0 ] . ' ?? \'\', \'' . addslashes(Smarty::$_CHARSET) . '\')';
+        return 'mb_strtoupper((string) ' . $params[ 0 ] . ' ?? \'\', \'' . addslashes(Smarty::$_CHARSET) . '\')';
     }
     // no MBString fallback
-    return 'strtoupper(' . $params[ 0 ] . ' ?? \'\')';
+    return 'strtoupper((string) ' . $params[ 0 ] . ' ?? \'\')';
 }
diff --git a/lib/smarty/libs/plugins/outputfilter.trimwhitespace.php b/lib/smarty/libs/plugins/outputfilter.trimwhitespace.php
index 2f747ad5..180cdd08 100644
--- a/lib/smarty/libs/plugins/outputfilter.trimwhitespace.php
+++ b/lib/smarty/libs/plugins/outputfilter.trimwhitespace.php
@@ -62,7 +62,7 @@ function smarty_outputfilter_trimwhitespace($source)
         }
     }
     $expressions = array(// replace multiple spaces between tags by a single space
-                         // can't remove them entirely, becaue that might break poorly implemented CSS display:inline-block elements
+                         // can't remove them entirely, because that might break poorly implemented CSS display:inline-block elements
                          '#(:SMARTY@!@|>)\s+(?=@!@SMARTY:|<)#s'                                    => '\1 \2',
                          // remove spaces between attributes (but not in attribute values!)
                          '#(([a-z0-9]\s*=\s*("[^"]*?")|(\'[^\']*?\'))|<[a-z0-9_]+)\s+([a-z/>])#is' => '\1 \5',
diff --git a/lib/smarty/libs/plugins/shared.escape_special_chars.php b/lib/smarty/libs/plugins/shared.escape_special_chars.php
index a204b092..355b02b5 100644
--- a/lib/smarty/libs/plugins/shared.escape_special_chars.php
+++ b/lib/smarty/libs/plugins/shared.escape_special_chars.php
@@ -20,7 +20,7 @@
 function smarty_function_escape_special_chars($string)
 {
     if (!is_array($string)) {
-        $string = htmlspecialchars($string, ENT_COMPAT, Smarty::$_CHARSET, false);
+        $string = htmlspecialchars((string) $string, ENT_COMPAT, Smarty::$_CHARSET, false);
     }
     return $string;
 }
diff --git a/lib/smarty/libs/plugins/variablefilter.htmlspecialchars.php b/lib/smarty/libs/plugins/variablefilter.htmlspecialchars.php
index 3c85295d..2eb12d20 100644
--- a/lib/smarty/libs/plugins/variablefilter.htmlspecialchars.php
+++ b/lib/smarty/libs/plugins/variablefilter.htmlspecialchars.php
@@ -15,5 +15,5 @@
  */
 function smarty_variablefilter_htmlspecialchars($source, Smarty_Internal_Template $template)
 {
-    return htmlspecialchars($source, ENT_QUOTES, Smarty::$_CHARSET);
+    return htmlspecialchars((string) $source, ENT_QUOTES, Smarty::$_CHARSET);
 }
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_compile_extends.php b/lib/smarty/libs/sysplugins/smarty_internal_compile_extends.php
index d72d2b76..69a7b552 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_compile_extends.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_compile_extends.php
@@ -30,7 +30,7 @@ class Smarty_Internal_Compile_Extends extends Smarty_Internal_Compile_Shared_Inh
      *
      * @var array
      */
-    public $optional_attributes = array('extends_resource');
+    public $optional_attributes = array();
 
     /**
      * Attribute definition: Overwrites base class.
@@ -62,29 +62,7 @@ class Smarty_Internal_Compile_Extends extends Smarty_Internal_Compile_Shared_Inh
         }
         // add code to initialize inheritance
         $this->registerInit($compiler, true);
-        $file = trim($_attr[ 'file' ], '\'"');
-        if (strlen($file) > 8 && substr($file, 0, 8) === 'extends:') {
-            // generate code for each template
-            $files = array_reverse(explode('|', substr($file, 8)));
-            $i = 0;
-            foreach ($files as $file) {
-                if ($file[ 0 ] === '"') {
-                    $file = trim($file, '".');
-                } else {
-                    $file = "'{$file}'";
-                }
-                $i++;
-                if ($i === count($files) && isset($_attr[ 'extends_resource' ])) {
-                    $this->compileEndChild($compiler);
-                }
-                $this->compileInclude($compiler, $file);
-            }
-            if (!isset($_attr[ 'extends_resource' ])) {
-                $this->compileEndChild($compiler);
-            }
-        } else {
-            $this->compileEndChild($compiler, $_attr[ 'file' ]);
-        }
+        $this->compileEndChild($compiler, $_attr[ 'file' ]);
         $compiler->has_code = false;
         return '';
     }
@@ -115,44 +93,4 @@ class Smarty_Internal_Compile_Extends extends Smarty_Internal_Compile_Shared_Inh
                 '') . ");\n?>"
         );
     }
-
-    /**
-     * Add code for including subtemplate to end of template
-     *
-     * @param \Smarty_Internal_TemplateCompilerBase $compiler
-     * @param string                                $template subtemplate name
-     *
-     * @throws \SmartyCompilerException
-     * @throws \SmartyException
-     */
-    private function compileInclude(Smarty_Internal_TemplateCompilerBase $compiler, $template)
-    {
-        $compiler->parser->template_postfix[] = new Smarty_Internal_ParseTree_Tag(
-            $compiler->parser,
-            $compiler->compileTag(
-                'include',
-                array(
-                    $template,
-                    array('scope' => 'parent')
-                )
-            )
-        );
-    }
-
-    /**
-     * Create source code for {extends} from source components array
-     *
-     * @param \Smarty_Internal_Template $template
-     *
-     * @return string
-     */
-    public static function extendsSourceArrayCode(Smarty_Internal_Template $template)
-    {
-        $resources = array();
-        foreach ($template->source->components as $source) {
-            $resources[] = $source->resource;
-        }
-        return $template->smarty->left_delimiter . 'extends file=\'extends:' . join('|', $resources) .
-               '\' extends_resource=true' . $template->smarty->right_delimiter;
-    }
 }
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_compile_private_modifier.php b/lib/smarty/libs/sysplugins/smarty_internal_compile_private_modifier.php
index aea082f0..31fd6e1d 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_compile_private_modifier.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_compile_private_modifier.php
@@ -109,9 +109,11 @@ class Smarty_Internal_Compile_Private_Modifier extends Smarty_Internal_CompileBa
                             if (!is_object($compiler->smarty->security_policy)
                                 || $compiler->smarty->security_policy->isTrustedPhpModifier($modifier, $compiler)
                             ) {
-                                trigger_error('Using php-function "' . $modifier . '" as a modifier is deprecated and will be ' .
-                                    'removed in a future release. Use Smarty::registerPlugin to explicitly register ' .
-                                    'a custom modifier.', E_USER_DEPRECATED);
+                                if (!in_array($modifier, ['time', 'join', 'is_array', 'in_array'])) {
+                                    trigger_error('Using unregistered function "' . $modifier . '" in a template is deprecated and will be ' .
+                                        'removed in a future release. Use Smarty::registerPlugin to explicitly register ' .
+                                        'a custom modifier.', E_USER_DEPRECATED);
+                                }
                                 $output = "{$modifier}({$params})";
                             }
                             $compiler->known_modifier_type[ $modifier ] = $type;
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_compile_private_print_expression.php b/lib/smarty/libs/sysplugins/smarty_internal_compile_private_print_expression.php
index 96bd3724..78f1c076 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_compile_private_print_expression.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_compile_private_print_expression.php
@@ -93,7 +93,7 @@ class Smarty_Internal_Compile_Private_Print_Expression extends Smarty_Internal_C
                 }
                 // autoescape html
                 if ($compiler->template->smarty->escape_html) {
-                    $output = "htmlspecialchars((string) {$output}, ENT_QUOTES, '" . addslashes(Smarty::$_CHARSET) . "')";
+                    $output = "htmlspecialchars((string) ({$output}), ENT_QUOTES, '" . addslashes(Smarty::$_CHARSET) . "')";
                 }
                 // loop over registered filters
                 if (!empty($compiler->template->smarty->registered_filters[ Smarty::FILTER_VARIABLE ])) {
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_debug.php b/lib/smarty/libs/sysplugins/smarty_internal_debug.php
index 570819d2..da67904c 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_debug.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_debug.php
@@ -238,9 +238,12 @@ class Smarty_Internal_Debug extends Smarty_Internal_Data
         $_config_vars = $ptr->config_vars;
         ksort($_config_vars);
         $debugging = $smarty->debugging;
+        $templateName = $obj->source->type . ':' . $obj->source->name;
+        $displayMode = $debugging === 2 || !$full;
+        $offset = $this->offset * 50;
         $_template = new Smarty_Internal_Template($debObj->debug_tpl, $debObj);
         if ($obj->_isTplObj()) {
-            $_template->assign('template_name', $obj->source->type . ':' . $obj->source->name);
+            $_template->assign('template_name', $templateName);
         }
         if ($obj->_objType === 1 || $full) {
             $_template->assign('template_data', $this->template_data[ $this->index ]);
@@ -250,8 +253,8 @@ class Smarty_Internal_Debug extends Smarty_Internal_Data
         $_template->assign('assigned_vars', $_assigned_vars);
         $_template->assign('config_vars', $_config_vars);
         $_template->assign('execution_time', microtime(true) - $smarty->start_time);
-        $_template->assign('display_mode', $debugging === 2 || !$full);
-        $_template->assign('offset', $this->offset * 50);
+        $_template->assign('targetWindow', $displayMode ? md5("$offset$templateName") : '__Smarty__');
+        $_template->assign('offset', $offset);
         echo $_template->fetch();
         if (isset($full)) {
             $this->index--;
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_errorhandler.php b/lib/smarty/libs/sysplugins/smarty_internal_errorhandler.php
index c2b653ef..4ddcfcd1 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_errorhandler.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_errorhandler.php
@@ -17,12 +17,24 @@ class Smarty_Internal_ErrorHandler
      */
     public $allowUndefinedVars = true;
 
+    /**
+     * Allows {$foo->propName} where propName is undefined.
+     * @var bool
+     */
+    public $allowUndefinedProperties = true;
+
     /**
      * Allows {$foo.bar} where bar is unset and {$foo.bar1.bar2} where either bar1 or bar2 is unset.
      * @var bool
      */
     public $allowUndefinedArrayKeys = true;
 
+    /**
+     * Allows {$foo->bar} where bar is not an object (e.g. null or false).
+     * @var bool
+     */
+    public $allowDereferencingNonObjects = true;
+
     private $previousErrorHandler = null;
 
     /**
@@ -66,17 +78,35 @@ class Smarty_Internal_ErrorHandler
      */
     public function handleError($errno, $errstr, $errfile, $errline, $errcontext = [])
     {
-        if ($this->allowUndefinedVars && $errstr == 'Attempt to read property "value" on null') {
+
+        if ($this->allowUndefinedVars && preg_match(
+                '/^(Attempt to read property "value" on null|Trying to get property (\'value\' )?of non-object)/',
+                $errstr
+            )) {
+            return; // suppresses this error
+        }
+
+        if ($this->allowUndefinedProperties && preg_match(
+                '/^(Undefined property)/',
+                $errstr
+            )) {
             return; // suppresses this error
         }
 
         if ($this->allowUndefinedArrayKeys && preg_match(
-            '/^(Undefined array key|Trying to access array offset on value of type null)/',
+            '/^(Undefined index|Undefined array key|Trying to access array offset on)/',
             $errstr
         )) {
             return; // suppresses this error
         }
 
+        if ($this->allowDereferencingNonObjects && preg_match(
+                '/^Attempt to read property ".+?" on/',
+                $errstr
+            )) {
+            return; // suppresses this error
+        }
+
         // pass all other errors through to the previous error handler or to the default PHP error handler
         return $this->previousErrorHandler ?
             call_user_func($this->previousErrorHandler, $errno, $errstr, $errfile, $errline, $errcontext) : false;
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_templatecompilerbase.php b/lib/smarty/libs/sysplugins/smarty_internal_templatecompilerbase.php
index d5c18d31..8ff3e052 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_templatecompilerbase.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_templatecompilerbase.php
@@ -455,15 +455,29 @@ abstract class Smarty_Internal_TemplateCompilerBase
             $this->smarty->_current_file = $this->template->source->filepath;
             // get template source
             if (!empty($this->template->source->components)) {
-                // we have array of inheritance templates by extends: resource
-                // generate corresponding source code sequence
-                $_content =
-                    Smarty_Internal_Compile_Extends::extendsSourceArrayCode($this->template);
+				$_compiled_code = '<?php $_smarty_tpl->_loadInheritance(); $_smarty_tpl->inheritance->init($_smarty_tpl, true); ?>';
+
+				$i = 0;
+				$reversed_components = array_reverse($this->template->getSource()->components);
+				foreach ($reversed_components as $source) {
+					$i++;
+					if ($i === count($reversed_components)) {
+						$_compiled_code .= '<?php $_smarty_tpl->inheritance->endChild($_smarty_tpl); ?>';
+					}
+					$_compiled_code .= $this->compileTag(
+						'include',
+						[
+							var_export($source->resource, true),
+							['scope' => 'parent'],
+						]
+					);
+				}
+				$_compiled_code = $this->postFilter($_compiled_code, $this->template);
             } else {
                 // get template source
                 $_content = $this->template->source->getContent();
+				$_compiled_code = $this->postFilter($this->doCompile($this->preFilter($_content), true));
             }
-            $_compiled_code = $this->postFilter($this->doCompile($this->preFilter($_content), true));
             if (!empty($this->required_plugins[ 'compiled' ]) || !empty($this->required_plugins[ 'nocache' ])) {
                 $_compiled_code = '<?php ' . $this->compileRequiredPlugins() . "?>\n" . $_compiled_code;
             }
@@ -640,7 +654,18 @@ abstract class Smarty_Internal_TemplateCompilerBase
                         return $func_name . '(' . $parameter[ 0 ] . ')';
                     }
                 } else {
-                    return $name . '(' . implode(',', $parameter) . ')';
+
+					if (
+						!$this->smarty->loadPlugin('smarty_modifiercompiler_' . $name)
+						&& !isset($this->smarty->registered_plugins[Smarty::PLUGIN_MODIFIER][$name])
+						&& !in_array($name, ['time', 'join', 'is_array', 'in_array'])
+					) {
+						trigger_error('Using unregistered function "' . $name . '" in a template is deprecated and will be ' .
+							'removed in a future release. Use Smarty::registerPlugin to explicitly register ' .
+							'a custom modifier.', E_USER_DEPRECATED);
+					}
+
+					return $name . '(' . implode(',', $parameter) . ')';
                 }
             } else {
                 $this->trigger_template_error("unknown function '{$name}'");
diff --git a/lib/smarty/libs/sysplugins/smarty_internal_templateparser.php b/lib/smarty/libs/sysplugins/smarty_internal_templateparser.php
index a2dd0d6f..c37d3c18 100644
--- a/lib/smarty/libs/sysplugins/smarty_internal_templateparser.php
+++ b/lib/smarty/libs/sysplugins/smarty_internal_templateparser.php
@@ -2425,6 +2425,9 @@ public static $yy_action = array(
         if (isset($this->smarty->registered_classes[$this->yystack[$this->yyidx + -2]->minor])) {
             $this->_retvalue = $this->smarty->registered_classes[$this->yystack[$this->yyidx + -2]->minor].'::'.$this->yystack[$this->yyidx + 0]->minor[0].$this->yystack[$this->yyidx + 0]->minor[1];
         } else {
+            trigger_error('Using unregistered static method "' . $this->yystack[$this->yyidx + -2]->minor.'::'.$this->yystack[$this->yyidx + 0]->minor[0] . '" in a template is deprecated and will be ' .
+                'removed in a future release. Use Smarty::registerClass to explicitly register ' .
+                'a class for access.', E_USER_DEPRECATED);
             $this->_retvalue = $this->yystack[$this->yyidx + -2]->minor.'::'.$this->yystack[$this->yyidx + 0]->minor[0].$this->yystack[$this->yyidx + 0]->minor[1];
         } 
     } else {
diff --git a/lib/smarty/libs/sysplugins/smarty_security.php b/lib/smarty/libs/sysplugins/smarty_security.php
index 97cd0521..49ae2a38 100644
--- a/lib/smarty/libs/sysplugins/smarty_security.php
+++ b/lib/smarty/libs/sysplugins/smarty_security.php
@@ -253,7 +253,7 @@ class Smarty_Security
      *
      * @param string $function_name
      * @param object $compiler compiler object
-     *
+     * @deprecated
      * @return boolean                 true if function is trusted
      */
     public function isTrustedPhpFunction($function_name, $compiler)
diff --git a/lib/smarty/libs/sysplugins/smarty_template_compiled.php b/lib/smarty/libs/sysplugins/smarty_template_compiled.php
index 37d8f0a9..b78a3b60 100644
--- a/lib/smarty/libs/sysplugins/smarty_template_compiled.php
+++ b/lib/smarty/libs/sysplugins/smarty_template_compiled.php
@@ -85,7 +85,7 @@ class Smarty_Template_Compiled extends Smarty_Template_Resource_Base
      *
      * @param Smarty_Internal_Template $_template
      *
-     * @return string
+     * @return void
      * @throws Exception
      */
     public function render(Smarty_Internal_Template $_template)
diff --git a/lib/smarty/smarty_version b/lib/smarty/smarty_version
index 1d2e7d6e..53157582 100644
--- a/lib/smarty/smarty_version
+++ b/lib/smarty/smarty_version
@@ -1,5 +1,5 @@
 $Id$
 
-Smarty version: 4.3.0  (released: 2022/11/22)
+Smarty version: 4.5.3  (released: 2024/05/28)
 
-https://github.com/smarty-php/smarty/archive/refs/tags/v4.3.0.tar.gz
+https://github.com/smarty-php/smarty/archive/refs/tags/v4.5.3.tar.gz