diff --git a/fluxRSS/composer.json b/fluxRSS/composer.json
index 6eaab9c..21ca7cc 100644
--- a/fluxRSS/composer.json
+++ b/fluxRSS/composer.json
@@ -1,7 +1,8 @@
 {
   "require": {
     "twig/twig": "^3.0",
-    "ext-pdo": "*"
+    "ext-pdo": "*",
+    "ext-dom": "*"
   },
   "autoload": {
     "psr-4": {