diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 98f8745e..d7fdad6e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,7 +55,6 @@ jobs:
           - '8.4'
 
     name: "PHP: ${{ matrix.php }}"
-    continue-on-error: ${{ matrix.php == '8.4' }}
 
     steps:
       - name: Checkout code
@@ -71,15 +70,8 @@ jobs:
 
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-composer-dependencies
-      - name: "Install Composer dependencies (PHP < 8.4)"
-        if: ${{ matrix.php < '8.4' }}
-        uses: "ramsey/composer-install@v2"
-
-      - name: "Install Composer dependencies (PHP 8.4)"
-        if: ${{ matrix.php >= '8.4' }}
+      - name: "Install Composer dependencies"
         uses: "ramsey/composer-install@v2"
-        with:
-          composer-options: --ignore-platform-reqs
 
       - name: Run unit tests
         run: composer test
diff --git a/.gitignore b/.gitignore
index 703d8e51..94dd5ecc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ SimplePie.compiled.php
 bin/
 vendor/
 composer.lock
+phpstan.neon
 phpunit.xml
 .php-cs-fixer.cache
 .phpunit.cache/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d097fdad..69b3dc9d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - Use `idn_to_ascii` function instead of `idna_convert` library (requires `intl` extension or a [polyfill](https://github.com/symfony/polyfill-intl-idn)) by @jtojnar in [#785](https://github.com/simplepie/simplepie/pull/785)
+- Use native `gzdecode` function instead of internal PHP implementation by @jtojnar in [#882](https://github.com/simplepie/simplepie/pull/882)
 
 ### Removed
 
@@ -26,6 +27,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - The method `SimplePie\SimplePie::set_file()` is deprecated, use `SimplePie\SimplePie::set_http_client()` or `SimplePie\SimplePie::set_raw_data()` instead
 - The method `SimplePie\Sanitize::pass_file_data()` is deprecated, use `SimplePie\Sanitize::set_http_client()` instead
 - Passing multiple URLs to `SimplePie\SimplePie::set_feed_url()` is deprecated. You can create separate `SimplePie` instance per feed and then use `SimplePie::merge_items()` to get a single list of items. ([#795](https://github.com/simplepie/simplepie/pull/795))
+- The `SimplePie\Gzdecode` class is deprecated. You can use native [`gzdecode`](https://www.php.net/manual/en/function.gzdecode.php) function by @jtojnar in [#882](https://github.com/simplepie/simplepie/pull/882)
 
 ## [1.8.0](https://github.com/simplepie/simplepie/compare/1.7.0...1.8.0) - 2023-01-20
 
diff --git a/phpstan.neon b/phpstan.neon.dist
similarity index 100%
rename from phpstan.neon
rename to phpstan.neon.dist
diff --git a/src/File.php b/src/File.php
index b56fac34..9099c849 100644
--- a/src/File.php
+++ b/src/File.php
@@ -236,12 +236,11 @@ public function __construct(string $url, int $timeout = 10, int $redirects = 5,
                                 switch (strtolower(trim($contentEncodingHeader, "\x09\x0A\x0D\x20"))) {
                                     case 'gzip':
                                     case 'x-gzip':
-                                        $decoder = new \SimplePie\Gzdecode($this->body);
-                                        if (!$decoder->parse()) {
+                                        if (($decompressed = gzdecode($this->body)) === false) {
                                             $this->error = 'Unable to decode HTTP "gzip" stream';
                                             $this->success = false;
                                         } else {
-                                            $this->body = trim($decoder->data);
+                                            $this->body = trim($decompressed);
                                         }
                                         break;
 
@@ -250,7 +249,7 @@ public function __construct(string $url, int $timeout = 10, int $redirects = 5,
                                             $this->body = $decompressed;
                                         } elseif (($decompressed = gzuncompress($this->body)) !== false) {
                                             $this->body = $decompressed;
-                                        } elseif (function_exists('gzdecode') && ($decompressed = gzdecode($this->body)) !== false) {
+                                        } elseif (($decompressed = gzdecode($this->body)) !== false) {
                                             $this->body = $decompressed;
                                         } else {
                                             $this->error = 'Unable to decode HTTP "deflate" stream';
diff --git a/src/Gzdecode.php b/src/Gzdecode.php
index 6adfc05c..f331d1dc 100644
--- a/src/Gzdecode.php
+++ b/src/Gzdecode.php
@@ -11,6 +11,8 @@
  * Decode 'gzip' encoded HTTP data
  *
  * @link http://www.gzip.org/format.txt
+ * @link https://www.php.net/manual/en/function.gzdecode.php
+ * @deprecated since SimplePie 1.9.0, use `gzdecode` function instead.
  */
 class Gzdecode
 {
diff --git a/src/IRI.php b/src/IRI.php
index 25b342a8..8543b2a5 100644
--- a/src/IRI.php
+++ b/src/IRI.php
@@ -297,19 +297,10 @@ public static function absolutize($base, $relative)
     protected function parse_iri(string $iri)
     {
         $iri = trim($iri, "\x20\x09\x0A\x0C\x0D");
-        if (preg_match('/^((?P<scheme>[^:\/?#]+):)?(\/\/(?P<authority>[^\/?#]*))?(?P<path>[^?#]*)(\?(?P<query>[^#]*))?(#(?P<fragment>.*))?$/', $iri, $match)) {
-            if ($match[1] === '') {
-                $match['scheme'] = null;
-            }
-            if ($match[3] === '') {
-                $match['authority'] = null;
-            }
-            if (!isset($match[6]) || $match[6] === '') {
-                $match['query'] = null;
-            }
-            if (!isset($match[8]) || $match[8] === '') {
-                $match['fragment'] = null;
-            }
+        if (preg_match('/^(?:(?P<scheme>[^:\/?#]+):)?(:?\/\/(?P<authority>[^\/?#]*))?(?P<path>[^?#]*)(?:\?(?P<query>[^#]*))?(?:#(?P<fragment>.*))?$/', $iri, $match, \PREG_UNMATCHED_AS_NULL)) {
+            // TODO: Remove once we require PHP ≥ 7.4.
+            $match['query'] = $match['query'] ?? null;
+            $match['fragment'] = $match['fragment'] ?? null;
             return $match;
         }
 
diff --git a/src/SimplePie.php b/src/SimplePie.php
index a02138ec..73d4ed7b 100644
--- a/src/SimplePie.php
+++ b/src/SimplePie.php
@@ -1520,7 +1520,7 @@ public function strip_htmltags($tags = '', ?bool $encode = null)
         }
         $this->sanitize->strip_htmltags($tags);
         if ($encode !== null) {
-            $this->sanitize->encode_instead_of_strip($tags);
+            $this->sanitize->encode_instead_of_strip($encode);
         }
     }