diff --git a/.travis.yml b/.travis.yml
index 2f6d0fb35..68590462f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,7 @@ before_script:
 # - pecl install channel://pecl.php.net/pthreads-3.1.6
  - echo | pecl install channel://pecl.php.net/yaml-2.0.4
  - pecl install channel://pecl.php.net/crypto-0.3.1
+ - pecl install channel://pecl.php.net/ds-1.2.8
  - git clone https://github.com/pmmp/pthreads.git
  - cd pthreads
  - git checkout 6ca019c58b4fa09ee2ff490f2444e34bef0773d0
diff --git a/composer.json b/composer.json
index 7a4bcb21b..013babad3 100644
--- a/composer.json
+++ b/composer.json
@@ -12,6 +12,7 @@
       "ext-crypto": "^0.3.1",
       "ext-ctype": "*",
       "ext-date": "*",
+      "ext-ds": "^1.2.7",
       "ext-gmp": "*",
       "ext-hash": "*",
       "ext-json": "*",
diff --git a/composer.lock b/composer.lock
index bfe6aa655..7d512129d 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "959fe32be1db4613fd22eb2c7c7b23c6",
+    "content-hash": "d865f72c482e34c96a7e46bc535d0c15",
     "packages": [
         {
             "name": "adhocore/json-comment",
@@ -413,12 +413,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/pmmp/RakLib.git",
-                "reference": "2d19bbaa4fb92d9eabe8c027ea0af9dbd6a90100"
+                "reference": "d9f15311ef328bddd5891fb7e92d2b3a7e48f501"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/pmmp/RakLib/zipball/2d19bbaa4fb92d9eabe8c027ea0af9dbd6a90100",
-                "reference": "2d19bbaa4fb92d9eabe8c027ea0af9dbd6a90100",
+                "url": "https://api.github.com/repos/pmmp/RakLib/zipball/d9f15311ef328bddd5891fb7e92d2b3a7e48f501",
+                "reference": "d9f15311ef328bddd5891fb7e92d2b3a7e48f501",
                 "shasum": ""
             },
             "require": {
@@ -446,7 +446,7 @@
                 "source": "https://github.com/pmmp/RakLib/tree/master",
                 "issues": "https://github.com/pmmp/RakLib/issues"
             },
-            "time": "2019-02-15T12:21:28+00:00"
+            "time": "2019-02-21T14:39:41+00:00"
         },
         {
             "name": "pocketmine/snooze",
@@ -488,12 +488,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/pmmp/SPL.git",
-                "reference": "d7bd7b8cb10c264ca6e6b5c3ef9b52e48a6f29d8"
+                "reference": "35110fcc742701d5f2b8093d63365c42900236c1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/pmmp/SPL/zipball/d7bd7b8cb10c264ca6e6b5c3ef9b52e48a6f29d8",
-                "reference": "d7bd7b8cb10c264ca6e6b5c3ef9b52e48a6f29d8",
+                "url": "https://api.github.com/repos/pmmp/SPL/zipball/35110fcc742701d5f2b8093d63365c42900236c1",
+                "reference": "35110fcc742701d5f2b8093d63365c42900236c1",
                 "shasum": ""
             },
             "type": "library",
@@ -512,7 +512,7 @@
             "support": {
                 "source": "https://github.com/pmmp/SPL/tree/master"
             },
-            "time": "2019-01-17T18:54:01+00:00"
+            "time": "2019-02-23T12:20:29+00:00"
         }
     ],
     "packages-dev": [],
@@ -536,6 +536,7 @@
         "ext-crypto": "^0.3.1",
         "ext-ctype": "*",
         "ext-date": "*",
+        "ext-ds": "^1.2.7",
         "ext-gmp": "*",
         "ext-hash": "*",
         "ext-json": "*",
diff --git a/src/pocketmine/PocketMine.php b/src/pocketmine/PocketMine.php
index b51cc9ebb..daf84e6cb 100644
--- a/src/pocketmine/PocketMine.php
+++ b/src/pocketmine/PocketMine.php
@@ -80,6 +80,7 @@ namespace pocketmine {
 			"crypto" => "php-crypto",
 			"ctype" => "ctype",
 			"date" => "Date",
+			"ds" => "Data Structures",
 			"gmp" => "GMP",
 			"hash" => "Hash",
 			"json" => "JSON",