diff --git a/manifests/profile/apt/mono.pp b/manifests/profile/apt/mono.pp
index a464c56d7..71b370419 100644
--- a/manifests/profile/apt/mono.pp
+++ b/manifests/profile/apt/mono.pp
@@ -7,16 +7,11 @@
 # @example
 #   include nebula::profile::apt::mono
 class nebula::profile::apt::mono {
-  # default to buster if we're not on a supported release
+  # default to buster since no newer release is available
   # check here to see if list of supported releases updated:
   # https://download.mono-project.com/repo/debian/index.html
-  if $::lsbdistcodename in ['xenial', 'bionic', 'focal', 'jessie', 'stretch', 'buster'] {
-    $apt_release = $::lsbdistcodename
-  } else {
-    warning("nebula::profile::apt::mono: defaulting to apt repo dist 'buster'")
-    # using buster because it's newer than focal
-    $apt_release = 'buster'
-  }
+  warning("nebula::profile::apt::mono: defaulting to apt repo dist 'buster'")
+  $apt_release = 'buster'
 
   apt::source { 'mono-official-stable':
     location => 'https://download.mono-project.com/repo/debian',
diff --git a/metadata.json b/metadata.json
index 7a5727c53..4ebe960d1 100644
--- a/metadata.json
+++ b/metadata.json
@@ -40,7 +40,7 @@
     },
     {
       "operatingsystem": "Ubuntu",
-      "operatingsystemrelease": ["20.04","22.04"]
+      "operatingsystemrelease": ["22.04"]
     }
   ],
   "requirements": [
diff --git a/spec/classes/profile/apt/mono_spec.rb b/spec/classes/profile/apt/mono_spec.rb
index 7e86f17bc..357cd9c53 100644
--- a/spec/classes/profile/apt/mono_spec.rb
+++ b/spec/classes/profile/apt/mono_spec.rb
@@ -10,12 +10,7 @@
       it do
         expect(subject).to contain_apt__source('mono-official-stable').with(
           location: 'https://download.mono-project.com/repo/debian',
-          release: case os
-                   when 'ubuntu-20.04-x86_64', 'debian-10-x86_64'
-                     "stable-#{facts[:lsbdistcodename]}"
-                   else
-                     'stable-buster'
-                   end,
+          release: 'stable-buster',
           repos: 'main',
         )
       end