diff --git a/metadata.json b/metadata.json
index 6a2e19f..3c9d85d 100644
--- a/metadata.json
+++ b/metadata.json
@@ -34,33 +34,38 @@
       "operatingsystem": "RedHat",
       "operatingsystemrelease": [
         "7",
-        "8"
+        "8",
+        "9"
       ]
     },
     {
       "operatingsystem": "CentOS",
       "operatingsystemrelease": [
         "7",
-        "8"
+        "8",
+        "9"
       ]
     },
     {
       "operatingsystem": "OracleLinux",
       "operatingsystemrelease": [
         "7",
-        "8"
+        "8",
+        "9"
       ]
     },
     {
       "operatingsystem": "Rocky",
       "operatingsystemrelease": [
-        "8"
+        "8",
+        "9"
       ]
     },
     {
       "operatingsystem": "AlmaLinux",
       "operatingsystemrelease": [
-        "8"
+        "8",
+        "9"
       ]
     },
     {
diff --git a/spec/acceptance/sysctl_spec.rb b/spec/acceptance/sysctl_spec.rb
index d34dd90..bf78367 100644
--- a/spec/acceptance/sysctl_spec.rb
+++ b/spec/acceptance/sysctl_spec.rb
@@ -198,6 +198,12 @@
         context 'when using a target file' do
           let(:manifest) do
             <<-EOM
+              if $facts['os']['family'] == 'RedHat' and versioncmp($facts['os']['release']['major'], '9') >= 0 {
+                package { 'systemd-udev':
+                  ensure => 'installed',
+                }
+                Package['systemd-udev'] -> Sysctl <| |>
+              }
               sysctl { 'fs.nr_open':
                 value  => '100001',
                 target => '/etc/sysctl.d/20-fs.conf'