diff --git a/composer-dist.json b/composer-dist.json
index 538af9e5f..5126ea1ce 100644
--- a/composer-dist.json
+++ b/composer-dist.json
@@ -25,6 +25,7 @@
         "zf1/zend-search-lucene": "*",
         "symfony/http-foundation": "^5.4",
         "php-di/php-di": "^6.4",
+        "slim/psr7": "^1.7",
         "seeddms/core": "dev-master",
         "seeddms/lucene": "dev-master",
         "seeddms/preview": "dev-master",