diff --git a/bin/psgi-bin/otobo.psgi b/bin/psgi-bin/otobo.psgi
index a950031259..ed5051e9a3 100755
--- a/bin/psgi-bin/otobo.psgi
+++ b/bin/psgi-bin/otobo.psgi
@@ -433,13 +433,14 @@ my $DBViewerApp = builder {
     enable $AdminOnlyMiddeware;
 
     # rewrite PATH_INFO, not sure why, but at least it seems to work
-    enable 'Rewrite', request => sub {
-        $_ ||= '/dbviewer/';
-        $_ = '/dbviewer/' if $_ eq '/';
-        $_ = '/otobo/dbviewer' . $_;
+    enable 'Plack::Middleware::Rewrite',
+        request => sub {
+            $_ ||= '/dbviewer/';
+            $_ = '/dbviewer/' if $_ eq '/';
+            $_ = '/otobo/dbviewer' . $_;
 
-        1;
-    };
+            1;
+        };
 
     my $server = Mojo::Server::PSGI->new;
     $server->load_app("$Bin/../mojo-bin/dbviewer.pl");
@@ -454,16 +455,20 @@ my $DBViewerApp = builder {
 my $StaticApp = builder {
 
     # Cache css-cache for 30 days
-    enable_if { $_[0]->{PATH_INFO} =~ m{skins/.*/.*/css-cache/.*\.(?:css|CSS)$} } 'Header', set => [ 'Cache-Control' => 'max-age=2592000 must-revalidate' ];
+    enable_if { $_[0]->{PATH_INFO} =~ m{skins/.*/.*/css-cache/.*\.(?:css|CSS)$} } 'Plack::Middleware::Header',
+        set => [ 'Cache-Control' => 'max-age=2592000 must-revalidate' ];
 
     # Cache css thirdparty for 4 hours, including icon fonts
-    enable_if { $_[0]->{PATH_INFO} =~ m{skins/.*/.*/css/thirdparty/.*\.(?:css|CSS|woff|svn)$} } 'Header', set => [ 'Cache-Control' => 'max-age=14400 must-revalidate' ];
+    enable_if { $_[0]->{PATH_INFO} =~ m{skins/.*/.*/css/thirdparty/.*\.(?:css|CSS|woff|svn)$} } 'Plack::Middleware::Header',
+        set => [ 'Cache-Control' => 'max-age=14400 must-revalidate' ];
 
     # Cache js-cache for 30 days
-    enable_if { $_[0]->{PATH_INFO} =~ m{js/js-cache/.*\.(?:js|JS)$} } 'Header', set => [ 'Cache-Control' => 'max-age=2592000 must-revalidate' ];
+    enable_if { $_[0]->{PATH_INFO} =~ m{js/js-cache/.*\.(?:js|JS)$} } 'Plack::Middleware::Header',
+        set => [ 'Cache-Control' => 'max-age=2592000 must-revalidate' ];
 
     # Cache js thirdparty for 4 hours
-    enable_if { $_[0]->{PATH_INFO} =~ m{js/thirdparty/.*\.(?:js|JS)$} } 'Header', set => [ 'Cache-Control' => 'max-age=14400 must-revalidate' ];
+    enable_if { $_[0]->{PATH_INFO} =~ m{js/thirdparty/.*\.(?:js|JS)$} } 'Plack::Middleware::Header',
+        set => [ 'Cache-Control' => 'max-age=14400 must-revalidate' ];
 
     Plack::App::File->new(root => "$Bin/../../var/httpd/htdocs")->to_app;
 };
@@ -471,14 +476,14 @@ my $StaticApp = builder {
 # Port of index.pl, customer.pl, public.pl, installer.pl, migration.pl, nph-genericinterface.pl to Plack.
 my $App = builder {
 
-    enable "Plack::Middleware::ErrorDocument",
+    enable 'Plack::Middleware::ErrorDocument',
         403 => '/otobo/index.pl';  # forbidden files
 
     # GATEWAY_INTERFACE is used for determining whether a command runs in a web context
     # Per default it would enable mysql_auto_reconnect.
     # But mysql_auto_reconnect is explicitly disabled in Kernel::System::DB::mysql.
     # OTOBO_RUNS_UNDER_PSGI indicates that PSGI is used.
-    enable ForceEnv =>
+    enable 'Plack::Middleware::ForceEnv',
         OTOBO_RUNS_UNDER_PSGI => '1',
         GATEWAY_INTERFACE     => 'CGI/1.1';
 
@@ -574,7 +579,7 @@ my $RPCApp = builder {
 
     # GATEWAY_INTERFACE is used for determining whether a command runs in a web context
     # OTOBO_RUNS_UNDER_PSGI is a signal that PSGI is used
-    enable ForceEnv =>
+    enable 'Plack::Middleware::ForceEnv',
         OTOBO_RUNS_UNDER_PSGI => '1',
         GATEWAY_INTERFACE     => 'CGI/1.1';