diff --git a/composer.lock b/composer.lock
index b9609ebfe5f8f7bd34e7e411a42dd026dcf6681a..e307475b5295995cd582c336a2263d94ef1a75fc 100644
--- a/composer.lock
+++ b/composer.lock
@@ -495,7 +495,7 @@
             "dist": {
                 "type": "path",
                 "url": "core",
-                "reference": "db88cf782861d4f89a1e811ddaefcd797dec6942"
+                "reference": "a8c2361f7740cf546b481c01e6503ea083ad469c"
             },
             "require": {
                 "asm89/stack-cors": "^2.1",
@@ -540,7 +540,7 @@
                 "symfony/serializer": "^6.4",
                 "symfony/validator": "^6.4",
                 "symfony/yaml": "^6.4",
-                "twig/twig": "^3.11.0"
+                "twig/twig": "^3.14.0"
             },
             "conflict": {
                 "drush/drush": "<12.4.3"
@@ -4347,24 +4347,23 @@
         },
         {
             "name": "twig/twig",
-            "version": "v3.11.0",
+            "version": "v3.14.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/twigphp/Twig.git",
-                "reference": "e80fb8ebba85c7341a97a9ebf825d7fd4b77708d"
+                "reference": "126b2c97818dbff0cdf3fbfc881aedb3d40aae72"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twigphp/Twig/zipball/e80fb8ebba85c7341a97a9ebf825d7fd4b77708d",
-                "reference": "e80fb8ebba85c7341a97a9ebf825d7fd4b77708d",
+                "url": "https://api.github.com/repos/twigphp/Twig/zipball/126b2c97818dbff0cdf3fbfc881aedb3d40aae72",
+                "reference": "126b2c97818dbff0cdf3fbfc881aedb3d40aae72",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.5",
+                "php": ">=8.0.2",
                 "symfony/deprecation-contracts": "^2.5|^3",
                 "symfony/polyfill-ctype": "^1.8",
                 "symfony/polyfill-mbstring": "^1.3",
-                "symfony/polyfill-php80": "^1.22",
                 "symfony/polyfill-php81": "^1.29"
             },
             "require-dev": {
@@ -4411,7 +4410,7 @@
             ],
             "support": {
                 "issues": "https://github.com/twigphp/Twig/issues",
-                "source": "https://github.com/twigphp/Twig/tree/v3.11.0"
+                "source": "https://github.com/twigphp/Twig/tree/v3.14.0"
             },
             "funding": [
                 {
@@ -4423,7 +4422,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-08-08T16:15:16+00:00"
+            "time": "2024-09-09T17:55:12+00:00"
         }
     ],
     "packages-dev": [
diff --git a/composer/Metapackage/CoreRecommended/composer.json b/composer/Metapackage/CoreRecommended/composer.json
index e3178120c49dafde7ddba41cc20f432761d297b7..91f3df0d0189fe79cb19c38db22aac1e892b385b 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -61,6 +61,6 @@
         "symfony/var-dumper": "~v6.4.7",
         "symfony/var-exporter": "~v6.4.7",
         "symfony/yaml": "~v6.4.7",
-        "twig/twig": "~v3.11.0"
+        "twig/twig": "~v3.14.0"
     }
 }
diff --git a/core/.deprecation-ignore.txt b/core/.deprecation-ignore.txt
index 656fd04b58bbe3a88fc5149d80f8927b783b0e76..dbaf1dc54740ec4a41fd85b50a989585473f8ed5 100644
--- a/core/.deprecation-ignore.txt
+++ b/core/.deprecation-ignore.txt
@@ -63,5 +63,14 @@
 %The "Drupal\\Tests\\Core\\DependencyInjection\\DependencySerializationTestDummy" class implements "Symfony\\Component\\DependencyInjection\\ContainerAwareInterface" that is deprecated since Symfony 6.4, use dependency injection instead.%
 %The "Drupal\\Tests\\Core\\Utility\\MockContainerAware" class implements "Symfony\\Component\\DependencyInjection\\ContainerAwareInterface" that is deprecated since Symfony 6.4, use dependency injection instead.%
 
-# Twig 3.11.0
+# Twig 3.
 %Since twig/twig 3.11: Changing the value of a "filter" node in a NodeVisitor class is not supported anymore.%
+%Since twig/twig 3.12: Not passing an instance of "TwigFunction" when creating a "attach_library" function of type "Twig\\Node\\Expression\\FunctionExpression" is deprecated.%
+%Since twig/twig 3.12: Not passing an instance of "TwigFunction" when creating a "add_component_context" function of type "Twig\\Node\\Expression\\FunctionExpression" is deprecated.%
+%Since twig/twig 3.12: Not passing an instance of "TwigFunction" when creating a "render_var" function of type "Twig\\Node\\Expression\\FunctionExpression" is deprecated.%
+%Since twig/twig 3.12: Not passing an instance of "TwigFunction" when creating a "validate_component_props" function of type "Twig\\Node\\Expression\\FunctionExpression" is deprecated.%
+%Since twig/twig 3.12: Getting node "filter" on a "Twig\\Node\\Expression\\FilterExpression" class is deprecated.%
+%Since twig/twig 3.12: Getting node "filter" on a "Twig\\Node\\Expression\\Filter\\DefaultFilter" class is deprecated.%
+%Since twig/twig 3.12: Getting node "filter" on a "Twig\\Node\\Expression\\Filter\\RawFilter" class is deprecated.%
+%Since twig/twig 3.12: The "tag" constructor argument of the "Drupal\\Core\\Template\\TwigNodeTrans" class is deprecated and ignored%
+%Since twig/twig 3.12: Twig Filter "spaceless" is deprecated%
diff --git a/core/composer.json b/core/composer.json
index 520ca0c9cb762f65aac56a9b16c0647ee988ce79..7c8c1ac8b3def1c9e53af0da8292bc0ccfe75850 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -33,7 +33,7 @@
         "symfony/process": "^6.4",
         "symfony/polyfill-iconv": "^1.26",
         "symfony/yaml": "^6.4",
-        "twig/twig": "^3.11.0",
+        "twig/twig": "^3.14.0",
         "doctrine/annotations": "^1.14",
         "guzzlehttp/guzzle": "^7.5",
         "guzzlehttp/psr7": "^2.4.5",
diff --git a/core/modules/system/tests/src/Kernel/Theme/TwigIncludeTest.php b/core/modules/system/tests/src/Kernel/Theme/TwigIncludeTest.php
index 7b79fe1a0af827e7bc936eb9e32d96d4650b45a2..711a008eafa3082ccb3c1178dd53dbfc6d87cfea 100644
--- a/core/modules/system/tests/src/Kernel/Theme/TwigIncludeTest.php
+++ b/core/modules/system/tests/src/Kernel/Theme/TwigIncludeTest.php
@@ -47,7 +47,7 @@ public function testTemplateInclusion(): void {
     $element = [];
     $element['test'] = [
       '#type' => 'inline_template',
-      '#template' => "{% include '@__main__\/core/tests/fixtures/files/sql-2.sql' %}",
+      '#template' => "{% include '@__main__/core/tests/fixtures/files/sql-2.sql' %}",
     ];
     try {
       $renderer->renderRoot($element);