diff --git a/Installation.md b/Installation.md
index 4f919b0..d3dc8f4 100644
--- a/Installation.md
+++ b/Installation.md
@@ -33,7 +33,7 @@ install the following:
   firewall for HTTPS
 * MariaDB (10.3 or newer); it is also recommended to secure the DB properly
   (set root password etc.) 
-* PHP 7.3 or newer
+* PHP 7.3 (actually this version needs to be exact, we have not fixed issues of 7.4 yet)
 * Node.js 12.x or newer (14.x recommended)
 
 A few tips for installing the database: