diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff5c75f3f..038d9691f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 
 - Release 2.4.5 🍧️ ([belomaxorka](https://github.com/belomaxorka))
 - Show torrent's announcers list in `filelist.php` page [\#1708](https://github.com/torrentpier/torrentpier/pull/1708) ([belomaxorka](https://github.com/belomaxorka))
+- [PHP 8.4] Fixed some deprecations [\#1718](https://github.com/torrentpier/torrentpier/pull/1718) ([belomaxorka](https://github.com/belomaxorka))
 - [Configurable] Show magnet-links for guests [\#1712](https://github.com/torrentpier/torrentpier/pull/1712) ([belomaxorka](https://github.com/belomaxorka))
 - Set `cursor: pointer;` for buttons, inputs (buttons) [\#1710](https://github.com/torrentpier/torrentpier/pull/1710), [\#1711](https://github.com/torrentpier/torrentpier/pull/1711) ([belomaxorka](https://github.com/belomaxorka))
 - Minor improvements [\#1705](https://github.com/torrentpier/torrentpier/pull/1705), [\#1713](https://github.com/torrentpier/torrentpier/pull/1713), [\#1715](https://github.com/torrentpier/torrentpier/pull/1715), [\#1717](https://github.com/torrentpier/torrentpier/pull/1717) ([belomaxorka](https://github.com/belomaxorka))
diff --git a/composer.json b/composer.json
index 1f038b28d..616b1ba38 100644
--- a/composer.json
+++ b/composer.json
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@@ -71,6 +71,7 @@
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     "symfony/mime": "^6.4",
     "symfony/mailer": "^6.4",
+    "symfony/polyfill": "v1.31.0",
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diff --git a/composer.lock b/composer.lock
index 1b102bfd7..7783f687f 100644
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-            "time": "2024-06-19T12:30:46+00:00"
+            "time": "2024-09-09T12:16:23+00:00"
         },
         {
             "name": "symfony/service-contracts",
-            "version": "v3.5.0",
+            "version": "v3.5.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/service-contracts.git",
-                "reference": "bd1d9e59a81d8fa4acdcea3f617c581f7475a80f"
+                "reference": "e53260aabf78fb3d63f8d79d69ece59f80d5eda0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/bd1d9e59a81d8fa4acdcea3f617c581f7475a80f",
-                "reference": "bd1d9e59a81d8fa4acdcea3f617c581f7475a80f",
+                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/e53260aabf78fb3d63f8d79d69ece59f80d5eda0",
+                "reference": "e53260aabf78fb3d63f8d79d69ece59f80d5eda0",
                 "shasum": ""
             },
             "require": {
@@ -4002,7 +3488,7 @@
                 "standards"
             ],
             "support": {
-                "source": "https://github.com/symfony/service-contracts/tree/v3.5.0"
+                "source": "https://github.com/symfony/service-contracts/tree/v3.5.1"
             },
             "funding": [
                 {
@@ -4018,7 +3504,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-04-18T09:32:20+00:00"
+            "time": "2024-09-25T14:20:29+00:00"
         },
         {
             "name": "vlucas/phpdotenv",
@@ -4108,16 +3594,16 @@
     "packages-dev": [
         {
             "name": "symfony/var-dumper",
-            "version": "v6.4.10",
+            "version": "v6.4.15",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/var-dumper.git",
-                "reference": "a71cc3374f5fb9759da1961d28c452373b343dd4"
+                "reference": "38254d5a5ac2e61f2b52f9caf54e7aa3c9d36b80"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/a71cc3374f5fb9759da1961d28c452373b343dd4",
-                "reference": "a71cc3374f5fb9759da1961d28c452373b343dd4",
+                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/38254d5a5ac2e61f2b52f9caf54e7aa3c9d36b80",
+                "reference": "38254d5a5ac2e61f2b52f9caf54e7aa3c9d36b80",
                 "shasum": ""
             },
             "require": {
@@ -4173,7 +3659,7 @@
                 "dump"
             ],
             "support": {
-                "source": "https://github.com/symfony/var-dumper/tree/v6.4.10"
+                "source": "https://github.com/symfony/var-dumper/tree/v6.4.15"
             },
             "funding": [
                 {
@@ -4189,20 +3675,21 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-07-26T12:30:32+00:00"
+            "time": "2024-11-08T15:28:48+00:00"
         }
     ],
     "aliases": [],
     "minimum-stability": "dev",
     "stability-flags": {
         "arokettu/monsterid": 20,
-        "gemorroj/m3u-parser": 20
+        "gemorroj/m3u-parser": 20,
+        "matthiasmullie/scrapbook": 20
     },
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": {
         "php": "^8.1 | ^8.2 | ^8.3 | ^8.4"
     },
-    "platform-dev": [],
+    "platform-dev": {},
     "plugin-api-version": "2.6.0"
 }
diff --git a/library/includes/functions.php b/library/includes/functions.php
index b34cca375..c09ff457e 100644
--- a/library/includes/functions.php
+++ b/library/includes/functions.php
@@ -2126,7 +2126,7 @@ function user_birthday_icon($user_birthday, $user_id): string
  * @param int|null $userId
  * @return array|null
  */
-function getBanInfo(int $userId = null): ?array
+function getBanInfo(?int $userId = null): ?array
 {
     global $datastore;
 
diff --git a/src/Legacy/Admin/Common.php b/src/Legacy/Admin/Common.php
index 99cf8b626..0210254ef 100644
--- a/src/Legacy/Admin/Common.php
+++ b/src/Legacy/Admin/Common.php
@@ -432,7 +432,7 @@ class Common
      * @param string $reason_move
      * @return bool
      */
-    public static function topic_move(int|array|string $topic_id, int|string $to_forum_id, int|string $from_forum_id = null, bool $leave_shadow = false, bool $insert_bot_msg = false, string $reason_move = ''): bool
+    public static function topic_move(int|array|string $topic_id, int|string $to_forum_id, null|int|string $from_forum_id = null, bool $leave_shadow = false, bool $insert_bot_msg = false, string $reason_move = ''): bool
     {
         global $log_action;
 
diff --git a/src/Legacy/Cache/Common.php b/src/Legacy/Cache/Common.php
index ba073ad6f..4c1929559 100644
--- a/src/Legacy/Cache/Common.php
+++ b/src/Legacy/Cache/Common.php
@@ -54,7 +54,7 @@ class Common
      * @param string|null $name
      * @return bool
      */
-    public function rm(string $name = null): bool
+    public function rm(?string $name = null): bool
     {
         return false;
     }
diff --git a/src/Legacy/Cache/File.php b/src/Legacy/Cache/File.php
index 5954e161e..362a1d308 100644
--- a/src/Legacy/Cache/File.php
+++ b/src/Legacy/Cache/File.php
@@ -116,7 +116,7 @@ class File extends Common
      * @param string|null $name
      * @return bool
      */
-    public function rm(string $name = null): bool
+    public function rm(?string $name = null): bool
     {
         $targetMethod = is_string($name) ? 'delete' : 'flush';
         $name = is_string($name) ? $this->prefix . $name : null;
diff --git a/src/Legacy/Post.php b/src/Legacy/Post.php
index 06e6466f1..fe3aadd40 100644
--- a/src/Legacy/Post.php
+++ b/src/Legacy/Post.php
@@ -422,10 +422,10 @@ class Post
      * @param int|string|null $old_forum_id
      * @param int|string|null $new_topic_id
      * @param string $new_topic_title
-     * @param int|null $old_topic_id
+     * @param int|string|null $old_topic_id
      * @param string $reason_move
      */
-    public static function insert_post(string $mode, int|string $topic_id, int|string $forum_id = null, int|string $old_forum_id = null, int|string $new_topic_id = null, string $new_topic_title = '', int $old_topic_id = null, string $reason_move = ''): void
+    public static function insert_post(string $mode, int|string $topic_id, null|int|string $forum_id = null, null|int|string $old_forum_id = null, null|int|string $new_topic_id = null, string $new_topic_title = '', null|int|string $old_topic_id = null, string $reason_move = ''): void
     {
         global $userdata, $lang;