diff --git a/manifest b/manifest
index 007a16a..412a1d9 100644
--- a/manifest
+++ b/manifest
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# 2013-2020 ungleich glarus ag (cdist at ungleich.ch)
+# 2013-2019 ungleich glarus ag (cdist at ungleich.ch)
 #
 # This file is part of cdist.
 #
@@ -24,10 +24,6 @@ os=$(cat $__global/explorer/os)
 osversion=$(cat "$__global/explorer/os_version")
 
 case "$os" in
-    alpine)
-        postgres_lib="postgresql-dev"
-        postgres_server="postgresql"
-    ;;
     debian|devuan)
         postgres_lib=libpq-dev
 
@@ -44,9 +40,6 @@ case "$os" in
             9*|ascii/ceres|ascii)
                 postgres_version=9.6
             ;;
-            10*|11*|beowulf/ceres|beowulf)
-                postgres_version=11
-            ;;
             *)
                 echo "Unsupported OS Version: $osversion" >&2
                 exit 1
@@ -61,22 +54,10 @@ case "$os" in
         postgres_server="postgresql-${postgres_version}"
 
     ;;
-    ubuntu)
-        postgres_lib=libpq-dev
-
-        case $osversion in
-            20.04)
-                postgres_version=12
-                ;;
-            *)
-                echo "Unsupported OS Version: $osversion" >&2
-                exit 1
-            ;;
-        esac
-        postgres_server="postgresql-${postgres_version}"
-
-        ;;
-
+    alpine)
+        postgres_lib="postgresql-dev"
+        postgres_server="postgresql"
+    ;;
     *)
         echo "Unsupported OS: $os" >&2
         exit 1