diff --git a/doc/02-Installation.md b/doc/02-Installation.md
index fdbcf83..1884c66 100644
--- a/doc/02-Installation.md
+++ b/doc/02-Installation.md
@@ -4,11 +4,10 @@
 Requirements
 ------------
 
-* Icinga Web 2 (>= 2.5.1)
-* PHP (>= 5.4 or 7.x)
+* Icinga Web 2 (>= 2.9)
+* PHP (>= 7.1)
 * Icinga Web 2 modules:
   * The `monitoring` module needs to be configured and enabled.
-  * [Icinga PHP Library (ipl)](https://github.com/Icinga/icingaweb2-module-ipl) (>= 0.1.1) (Icinga Web 2 module)
 
 Installation from .tar.gz
 -------------------------