diff --git a/vars/CentOS_9.yml b/vars/CentOS_9.yml
new file mode 100644
index 0000000..2b8de84
--- /dev/null
+++ b/vars/CentOS_9.yml
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: MIT
+---
+# Put internal variables here with CentOS 9 specific values.
+
+__postgresql_packages: >-
+  {{ ['@postgresql:' + postgresql_version +
+       '/server'] if postgresql_version != '13' else
+       ['postgresql-server'] }}
diff --git a/vars/RedHat_9.yml b/vars/RedHat_9.yml
new file mode 100644
index 0000000..982f354
--- /dev/null
+++ b/vars/RedHat_9.yml
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: MIT
+---
+# Put internal variables here with Red Hat Enterprise Linux 9 specific values.
+
+__postgresql_packages: >-
+  {{ ['@postgresql:' + postgresql_version +
+       '/server'] if postgresql_version != '13' else
+       ['postgresql-server'] }}