diff --git a/README.md b/README.md
index ab7dc2ed..08dab43e 100644
--- a/README.md
+++ b/README.md
@@ -14,8 +14,8 @@ The Arsse has the following requirements:
 
 - A Linux server utilizing systemd and Nginx (tested on Ubuntu 16.04)
 - PHP 7.0.7 or later with the following extensions:
-    - [intl](http://php.net/manual/en/book.intl.php), [json](http://php.net/manual/en/book.json.php), [hash](http://php.net/manual/en/book.hash.php), and [pcre](http://php.net/manual/en/book.pcre.php)
-    - [dom](http://php.net/manual/en/book.dom.php), [simplexml](http://php.net/manual/en/book.simplexml.php), and [iconv](http://php.net/manual/en/book.iconv.php) (for picoFeed)
+    - [intl](http://php.net/manual/en/book.intl.php), [json](http://php.net/manual/en/book.json.php), [hash](http://php.net/manual/en/book.hash.php), and [dom](http://php.net/manual/en/book.dom.php)
+    - [simplexml](http://php.net/manual/en/book.simplexml.php), and [iconv](http://php.net/manual/en/book.iconv.php) (for picoFeed)
     - One of:
         - [sqlite3](http://php.net/manual/en/book.sqlite3.php) or [pdo_sqlite](http://php.net/manual/en/ref.pdo-sqlite.php) for SQLite databases
         - [pgsql](http://php.net/manual/en/book.pgsql.php) or [pdo_pgsql](http://php.net/manual/en/ref.pdo-pgsql.php) for PostgreSQL 10 or later databases
diff --git a/composer.json b/composer.json
index 0f5570c3..0669d657 100644
--- a/composer.json
+++ b/composer.json
@@ -22,6 +22,7 @@
         "ext-intl": "*",
         "ext-json": "*",
         "ext-hash": "*",
+        "ext-dom": "*",
         "p3k/picofeed": "0.1.*",
         "hosteurope/password-generator": "^1.0",
         "docopt/docopt": "^1.0",
diff --git a/composer.lock b/composer.lock
index b5e5d385..986e47cc 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": "d7a6a00be3d97c11d09ec4d4e56d36e0",
+    "content-hash": "f61a02cd168914d91847b89dcd00d464",
     "packages": [
         {
             "name": "docopt/docopt",
@@ -354,16 +354,16 @@
     "packages-dev": [
         {
             "name": "bamarni/composer-bin-plugin",
-            "version": "v1.2.0",
+            "version": "v1.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/bamarni/composer-bin-plugin.git",
-                "reference": "62fef740245a85f00665e81ea8f0aa0b72afe6e7"
+                "reference": "67f9d314dc7ecf7245b8637906e151ccc62b8d24"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/bamarni/composer-bin-plugin/zipball/62fef740245a85f00665e81ea8f0aa0b72afe6e7",
-                "reference": "62fef740245a85f00665e81ea8f0aa0b72afe6e7",
+                "url": "https://api.github.com/repos/bamarni/composer-bin-plugin/zipball/67f9d314dc7ecf7245b8637906e151ccc62b8d24",
+                "reference": "67f9d314dc7ecf7245b8637906e151ccc62b8d24",
                 "shasum": ""
             },
             "require": {
@@ -371,7 +371,7 @@
             },
             "require-dev": {
                 "composer/composer": "dev-master",
-                "symfony/console": "^2.5 || ^3.0"
+                "symfony/console": "^2.5 || ^3.0 || ^4.0"
             },
             "type": "composer-plugin",
             "extra": {
@@ -389,7 +389,7 @@
             "license": [
                 "MIT"
             ],
-            "time": "2017-09-11T13:13:58+00:00"
+            "time": "2019-03-17T12:38:04+00:00"
         }
     ],
     "aliases": [],
@@ -401,7 +401,8 @@
         "php": "^7.0",
         "ext-intl": "*",
         "ext-json": "*",
-        "ext-hash": "*"
+        "ext-hash": "*",
+        "ext-dom": "*"
     },
     "platform-dev": []
 }
diff --git a/vendor-bin/csfixer/composer.lock b/vendor-bin/csfixer/composer.lock
index 155169e4..e48cd3d7 100644
--- a/vendor-bin/csfixer/composer.lock
+++ b/vendor-bin/csfixer/composer.lock
@@ -114,16 +114,16 @@
         },
         {
             "name": "doctrine/annotations",
-            "version": "v1.6.0",
+            "version": "v1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/annotations.git",
-                "reference": "c7f2050c68a9ab0bdb0f98567ec08d80ea7d24d5"
+                "reference": "53120e0eb10355388d6ccbe462f1fea34ddadb24"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/annotations/zipball/c7f2050c68a9ab0bdb0f98567ec08d80ea7d24d5",
-                "reference": "c7f2050c68a9ab0bdb0f98567ec08d80ea7d24d5",
+                "url": "https://api.github.com/repos/doctrine/annotations/zipball/53120e0eb10355388d6ccbe462f1fea34ddadb24",
+                "reference": "53120e0eb10355388d6ccbe462f1fea34ddadb24",
                 "shasum": ""
             },
             "require": {
@@ -178,7 +178,7 @@
                 "docblock",
                 "parser"
             ],
-            "time": "2017-12-06T07:11:42+00:00"
+            "time": "2019-03-25T19:12:02+00:00"
         },
         {
             "name": "doctrine/lexer",
diff --git a/vendor-bin/phpunit/composer.lock b/vendor-bin/phpunit/composer.lock
index 016ad853..32cf6449 100644
--- a/vendor-bin/phpunit/composer.lock
+++ b/vendor-bin/phpunit/composer.lock
@@ -835,16 +835,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "7.5.7",
+            "version": "7.5.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "eb343b86753d26de07ecba7868fa983104361948"
+                "reference": "c29c0525cf4572c11efe1db49a8b8aee9dfac58a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/eb343b86753d26de07ecba7868fa983104361948",
-                "reference": "eb343b86753d26de07ecba7868fa983104361948",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/c29c0525cf4572c11efe1db49a8b8aee9dfac58a",
+                "reference": "c29c0525cf4572c11efe1db49a8b8aee9dfac58a",
                 "shasum": ""
             },
             "require": {
@@ -915,7 +915,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2019-03-16T07:31:17+00:00"
+            "time": "2019-03-26T13:23:54+00:00"
         },
         {
             "name": "sebastian/code-unit-reverse-lookup",