diff --git a/README.md b/README.md
index d99438a..1098945 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ development, you can sponsor it or contribute in any way you can.
   * Webserver such as Apache 2, or Lighttpd, etc…
   * PHP (>= 8.1) module for the webserver (`libapache2-mod-php` for Apache 2
     for example)
+  * Composer to install dependencies
   * The PDO extension to interact with SQLite for anti-spam feature
     (`php8.2-sqlite3` on Debian for example)
   * The XML package is required as well (`php8.2-xml` on Debian for example)
@@ -60,6 +61,10 @@ Questions? Comments? Join us in the `#looking-glass` Slack channel on
 
 ## Configuration
 
+Install [Composer](https://getcomposer.org/) and run `composer install` to
+install dependencies for this project. This step is not necessary if you use
+Docker.
+
 Copy the configuration **config.php.example** file to create a **config.php**
 file. It contains all the values (PHP variables) used to customize the looking
 glass. Details about configuration options are available in the
diff --git a/composer.lock b/composer.lock
index 8ea3edd..4ff21b3 100644
--- a/composer.lock
+++ b/composer.lock
@@ -128,24 +128,24 @@
         },
         {
             "name": "paragonie/constant_time_encoding",
-            "version": "v2.6.3",
+            "version": "v3.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/paragonie/constant_time_encoding.git",
-                "reference": "58c3f47f650c94ec05a151692652a868995d2938"
+                "reference": "df1e7fde177501eee2037dd159cf04f5f301a512"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/paragonie/constant_time_encoding/zipball/58c3f47f650c94ec05a151692652a868995d2938",
-                "reference": "58c3f47f650c94ec05a151692652a868995d2938",
+                "url": "https://api.github.com/repos/paragonie/constant_time_encoding/zipball/df1e7fde177501eee2037dd159cf04f5f301a512",
+                "reference": "df1e7fde177501eee2037dd159cf04f5f301a512",
                 "shasum": ""
             },
             "require": {
-                "php": "^7|^8"
+                "php": "^8"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6|^7|^8|^9",
-                "vimeo/psalm": "^1|^2|^3|^4"
+                "phpunit/phpunit": "^9",
+                "vimeo/psalm": "^4|^5"
             },
             "type": "library",
             "autoload": {
@@ -191,7 +191,7 @@
                 "issues": "https://github.com/paragonie/constant_time_encoding/issues",
                 "source": "https://github.com/paragonie/constant_time_encoding"
             },
-            "time": "2022-06-14T06:56:20+00:00"
+            "time": "2024-05-08T12:36:18+00:00"
         },
         {
             "name": "paragonie/random_compat",
@@ -245,20 +245,20 @@
         },
         {
             "name": "phpseclib/phpseclib",
-            "version": "3.0.36",
+            "version": "3.0.42",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpseclib/phpseclib.git",
-                "reference": "c2fb5136162d4be18fdd4da9980696f3aee96d7b"
+                "reference": "db92f1b1987b12b13f248fe76c3a52cadb67bb98"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpseclib/phpseclib/zipball/c2fb5136162d4be18fdd4da9980696f3aee96d7b",
-                "reference": "c2fb5136162d4be18fdd4da9980696f3aee96d7b",
+                "url": "https://api.github.com/repos/phpseclib/phpseclib/zipball/db92f1b1987b12b13f248fe76c3a52cadb67bb98",
+                "reference": "db92f1b1987b12b13f248fe76c3a52cadb67bb98",
                 "shasum": ""
             },
             "require": {
-                "paragonie/constant_time_encoding": "^1|^2",
+                "paragonie/constant_time_encoding": "^1|^2|^3",
                 "paragonie/random_compat": "^1.4|^2.0|^9.99.99",
                 "php": ">=5.6.1"
             },
@@ -335,7 +335,7 @@
             ],
             "support": {
                 "issues": "https://github.com/phpseclib/phpseclib/issues",
-                "source": "https://github.com/phpseclib/phpseclib/tree/3.0.36"
+                "source": "https://github.com/phpseclib/phpseclib/tree/3.0.42"
             },
             "funding": [
                 {
@@ -351,20 +351,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-02-26T05:13:14+00:00"
+            "time": "2024-09-16T03:06:04+00:00"
         },
         {
             "name": "twbs/bootstrap",
-            "version": "v5.3.2",
+            "version": "v5.3.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/twbs/bootstrap.git",
-                "reference": "344e912d04b5b6a04482113eff20ab416ff01048"
+                "reference": "6e1f75f420f68e1d52733b8e407fc7c3766c9dba"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twbs/bootstrap/zipball/344e912d04b5b6a04482113eff20ab416ff01048",
-                "reference": "344e912d04b5b6a04482113eff20ab416ff01048",
+                "url": "https://api.github.com/repos/twbs/bootstrap/zipball/6e1f75f420f68e1d52733b8e407fc7c3766c9dba",
+                "reference": "6e1f75f420f68e1d52733b8e407fc7c3766c9dba",
                 "shasum": ""
             },
             "replace": {
@@ -399,9 +399,9 @@
             ],
             "support": {
                 "issues": "https://github.com/twbs/bootstrap/issues",
-                "source": "https://github.com/twbs/bootstrap/tree/v5.3.2"
+                "source": "https://github.com/twbs/bootstrap/tree/v5.3.3"
             },
-            "time": "2023-09-14T14:19:27+00:00"
+            "time": "2024-02-20T15:14:29+00:00"
         },
         {
             "name": "twbs/bootstrap-icons",
@@ -446,10 +446,10 @@
     "packages-dev": [],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {},
     "prefer-stable": false,
     "prefer-lowest": false,
-    "platform": [],
-    "platform-dev": [],
+    "platform": {},
+    "platform-dev": {},
     "plugin-api-version": "2.6.0"
 }