diff --git a/composer.json b/composer.json
index d63ca2091..6bfec7f97 100644
--- a/composer.json
+++ b/composer.json
@@ -70,6 +70,9 @@
     "ml/json-ld": "1.*",
     "medialize/uri.js": "1.19.0",
     "ext-gettext": "*",
+    "ext-intl": "*",
+    "ext-mbstring": "*",
+    "ext-xsl": "*",
     "monolog/monolog": "1.23.*",
     "newerton/jquery-mousewheel": "dev-master",
     "pamelafox/lscache": "1.0.5",