diff --git a/composer.json b/composer.json
index 80c31905acc74..5f3689981728a 100644
--- a/composer.json
+++ b/composer.json
@@ -74,7 +74,7 @@
     "joomla/string": "^3.0.1",
     "joomla/uri": "~3.0",
     "joomla/utilities": "~3.0",
-    "algo26-matthias/idna-convert": "^3.1.1",
+    "algo26-matthias/idna-convert": "^4.0.4",
     "defuse/php-encryption": "^2.4.0",
     "doctrine/inflector": "^1.4.4",
     "fig/link-util": "^1.2.0",
diff --git a/composer.lock b/composer.lock
index 2deeaa15eb660..c7ef8b6076f38 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,32 +4,33 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "ebf1b8f344b8e7aa2b24103410c8a7bf",
+    "content-hash": "7a5639f89fcc5a3c5f43792a91299aaf",
     "packages": [
         {
             "name": "algo26-matthias/idna-convert",
-            "version": "v3.1.1",
+            "version": "v4.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/algo26-matthias/idna-convert.git",
-                "reference": "d8dbf18599548b8460ab0c462f299a15cacf6e66"
+                "reference": "87fcd0252e86bf8f881b83ebbacd26fede361356"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/algo26-matthias/idna-convert/zipball/d8dbf18599548b8460ab0c462f299a15cacf6e66",
-                "reference": "d8dbf18599548b8460ab0c462f299a15cacf6e66",
+                "url": "https://api.github.com/repos/algo26-matthias/idna-convert/zipball/87fcd0252e86bf8f881b83ebbacd26fede361356",
+                "reference": "87fcd0252e86bf8f881b83ebbacd26fede361356",
                 "shasum": ""
             },
             "require": {
                 "ext-pcre": "*",
                 "jakeasmith/http_build_url": "^1",
-                "php": ">=7.2.0"
+                "php": ">=8.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "8.0"
+                "phpunit/phpunit": "^9 || ^10"
             },
             "suggest": {
                 "ext-iconv": "Install ext/iconv for using input / output other than UTF-8 or ISO-8859-1",
+                "ext-intl": "Install ext/intl for better case folding",
                 "ext-mbstring": "Install ext/mbstring for using input / output other than UTF-8 or ISO-8859-1"
             },
             "type": "library",
@@ -58,9 +59,9 @@
             ],
             "support": {
                 "issues": "https://github.com/algo26-matthias/idna-convert/issues",
-                "source": "https://github.com/algo26-matthias/idna-convert/tree/v3.1.1"
+                "source": "https://github.com/algo26-matthias/idna-convert/tree/v4.0.4"
             },
-            "time": "2024-03-18T16:24:08+00:00"
+            "time": "2025-03-16T10:00:35+00:00"
         },
         {
             "name": "brick/math",