diff --git a/Installation-guide.md b/Installation-guide.md
index c6a320a..65a7fd3 100644
--- a/Installation-guide.md
+++ b/Installation-guide.md
@@ -6,8 +6,6 @@ libapache2-mod-perl2
 libapache2-reload-perl 
 perlmagick 
 libdbd-pg-perl 
-libgd-graph3d-perl 
-libxml-smart-perl 
 libcalendar-simple-perl 
 libdate-calc-perl 
 libdbd-csv-perl 
@@ -24,7 +22,6 @@ libdatetime-format-pg-perl
 libcgi-pm-perl 
 libfile-copy-recursive-perl 
 libscalar-util-numeric-perl 
-libtest-json-perl 
 libauthen-pam-perl 
 libnet-smtps-perl 
 libconfig-general-perl 
@@ -47,4 +44,4 @@ sudo a2enmod proxy_http
 sudo service apache2 restart
 ```
 
-apache2 mod-perl needs to be run by mpm_prefork
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+The postgresql DBMS have to be installed utf-8 encoded with de-DE.utf-8 locales, because the date style is done in german way. 
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