diff --git a/composer.json b/composer.json
index 5e89924628..0daa3ea788 100644
--- a/composer.json
+++ b/composer.json
@@ -47,6 +47,10 @@
 		"platform": {
 			"php": "7.3"
 		},
+		"preferred-install": {
+			"egroupware/*": "source",
+			"*": "dist"
+		},
 		"fxp-asset": {
 			"enabled": false
 		},
@@ -154,4 +158,4 @@
 	},
     "minimum-stability": "dev",
     "prefer-stable": true
-}
+}
\ No newline at end of file
diff --git a/composer.lock b/composer.lock
index 15cb598d37..6e350fe3ee 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1632,12 +1632,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/EGroupware/Icalendar.git",
-                "reference": "01960a7b12d50558870c7878b30452784ee9cbc5"
+                "reference": "435450bb9393b785545e6b74e5f6089ee423c69a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/EGroupware/Icalendar/zipball/01960a7b12d50558870c7878b30452784ee9cbc5",
-                "reference": "01960a7b12d50558870c7878b30452784ee9cbc5",
+                "url": "https://api.github.com/repos/EGroupware/Icalendar/zipball/435450bb9393b785545e6b74e5f6089ee423c69a",
+                "reference": "435450bb9393b785545e6b74e5f6089ee423c69a",
                 "shasum": ""
             },
             "require": {
@@ -12234,4 +12234,4 @@
         "php": "7.3"
     },
     "plugin-api-version": "2.2.0"
-}
+}
\ No newline at end of file