6 files changed, 34 insertions, 8 deletions
diff --git a/vendor/league/commonmark/CHANGELOG.md b/vendor/league/commonmark/CHANGELOG.md
index 611832b8de..54e6f369d3 100644
--- a/vendor/league/commonmark/CHANGELOG.md
+++ b/vendor/league/commonmark/CHANGELOG.md
@@ -4,6 +4,22 @@ Updates should follow the [Keep a CHANGELOG](https://keepachangelog.com/) princi
 
 ## [Unreleased][unreleased]
 
+## [1.5.3] - 2020-07-19
+
+### Fixed
+
+ - Fixed regression of multi-byte inline parser characters not being matched
+
+## [1.5.2] - 2020-07-19
+
+### Changed
+
+ - Significantly improved performance of the inline parser regex
+
+### Fixed
+
+ - Fixed parent class lookups for non-existent classes on PHP 8 (#517)
+
 ## [1.5.1] - 2020-06-27
 
 ### Fixed
@@ -347,7 +363,9 @@ No changes were made since 1.0.0-rc1.
    - Removed `DelimiterStack::iterateByCharacters()` (use the new `processDelimiters()` method instead)
    - Removed the protected `DelimiterStack::findMatchingOpener()` method
 
-[unreleased]: https://github.com/thephpleague/commonmark/compare/1.5.1...1.5
+[unreleased]: https://github.com/thephpleague/commonmark/compare/1.5.3...1.5
+[1.5.3]: https://github.com/thephpleague/commonmark/compare/1.5.2...1.5.3
+[1.5.2]: https://github.com/thephpleague/commonmark/compare/1.5.1...1.5.2
 [1.5.1]: https://github.com/thephpleague/commonmark/compare/1.5.0...1.5.1
 [1.5.0]: https://github.com/thephpleague/commonmark/compare/1.4.3...1.5.0
 [1.4.3]: https://github.com/thephpleague/commonmark/compare/1.4.2...1.4.3
diff --git a/vendor/league/commonmark/README.md b/vendor/league/commonmark/README.md
index f800d51ff7..11342983b7 100644
--- a/vendor/league/commonmark/README.md
+++ b/vendor/league/commonmark/README.md
@@ -117,9 +117,9 @@ Any classes or methods marked `@internal` are not intended for use outside of th
 
 ## 🛠️ Maintenance & Support
 
-When a new **minor** version (`1.x`) is released, the previous one will continue to receive security and bug fixes for *at least* 3 months.
+When a new **minor** version (e.g. `1.4` -> `1.5`) is released, the previous one (`1.4`) will continue to receive security and critical bug fixes for *at least* 3 months.
 
-When a new **major** version is released (`1.0`, `2.0`, etc), the previous one (`0.19.x`) will receive bug fixes for *at least* 3 months and security updates for 6 months after that new release comes out.
+When a new **major** version is released (e.g. `1.5` -> `2.0`), the previous one (`1.5`) will receive critical bug fixes for *at least* 3 months and security updates for 6 months after that new release comes out.
 
 (This policy may change in the future and exceptions may be made on a case-by-case basis.)
 
diff --git a/vendor/league/commonmark/composer.json b/vendor/league/commonmark/composer.json
index 3a39e2820d..16395270c5 100644
--- a/vendor/league/commonmark/composer.json
+++ b/vendor/league/commonmark/composer.json
@@ -32,10 +32,12 @@
         "michelf/php-markdown": "~1.4",
         "mikehaertl/php-shellcommand": "^1.4",
         "phpstan/phpstan": "^0.12",
-        "phpunit/phpunit": "^7.5",
+        "phpunit/phpunit": "^7.5 || ^8.5 || ^9.2",
         "scrutinizer/ocular": "^1.5",
         "symfony/finder": "^4.2"
     },
+    "minimum-stability": "dev",
+    "prefer-stable": true,
     "conflict": {
         "scrutinizer/ocular": "1.7.*"
     },
diff --git a/vendor/league/commonmark/src/CommonMarkConverter.php b/vendor/league/commonmark/src/CommonMarkConverter.php
index 463115960b..e0d710e694 100644
--- a/vendor/league/commonmark/src/CommonMarkConverter.php
+++ b/vendor/league/commonmark/src/CommonMarkConverter.php
@@ -27,7 +27,7 @@ class CommonMarkConverter extends Converter
      * @deprecated in 1.5.0 and will be removed from 2.0.0.
      *   Use \Composer\InstalledVersions provided by composer-runtime-api instead.
      */
-    public const VERSION = '1.5.1';
+    public const VERSION = '1.5.3';
 
     /** @var EnvironmentInterface */
     protected $environment;
diff --git a/vendor/league/commonmark/src/Environment.php b/vendor/league/commonmark/src/Environment.php
index 36640b9a34..3943738630 100644
--- a/vendor/league/commonmark/src/Environment.php
+++ b/vendor/league/commonmark/src/Environment.php
@@ -369,10 +369,15 @@ final class Environment implements ConfigurableEnvironmentInterface
 
         if (empty($chars)) {
             // If no special inline characters exist then parse the whole line
-            $this->inlineParserCharacterRegex = '/^.+$/u';
+            $this->inlineParserCharacterRegex = '/^.+$/';
         } else {
             // Match any character which inline parsers are not interested in
-            $this->inlineParserCharacterRegex = '/^[^' . \preg_quote(\implode('', $chars), '/') . ']+/u';
+            $this->inlineParserCharacterRegex = '/^[^' . \preg_quote(\implode('', $chars), '/') . ']+/';
+
+            // Only add the u modifier (which slows down performance) if we have a multi-byte UTF-8 character in our regex
+            if (\strlen($this->inlineParserCharacterRegex) > \mb_strlen($this->inlineParserCharacterRegex)) {
+                $this->inlineParserCharacterRegex .= 'u';
+            }
         }
     }
 
@@ -410,7 +415,7 @@ final class Environment implements ConfigurableEnvironmentInterface
             return $list[$class];
         }
 
-        while ($parent = \get_parent_class($parent ?? $class)) {
+        while (\class_exists($parent = $parent ?? $class) && $parent = \get_parent_class($parent)) {
             if (!isset($list[$parent])) {
                 continue;
             }
diff --git a/vendor/league/commonmark/src/Reference/Reference.php b/vendor/league/commonmark/src/Reference/Reference.php
index aeb3a6c956..ebe57aa8bf 100644
--- a/vendor/league/commonmark/src/Reference/Reference.php
+++ b/vendor/league/commonmark/src/Reference/Reference.php
@@ -65,6 +65,7 @@ final class Reference implements ReferenceInterface
      * @return string
      *
      * @deprecated Use TextNormalizer::normalize() instead
+     * @group legacy
      */
     public static function normalizeReference(string $string): string
     {