diff --git a/README.md b/README.md
index fce07e2..9292472 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,7 @@ Supported Linux distributions and versions:
 - CentOS 8 Stream
 - AlmaLinux 9
 - AlmaLinux 8
+- Rocky Linux 9
 - Rocky Linux 8
 - Debian 11
 - Debian 10
diff --git a/xo-install.sh b/xo-install.sh
index 9ad1d51..93305b1 100755
--- a/xo-install.sh
+++ b/xo-install.sh
@@ -1267,8 +1267,8 @@ function CheckOS {
         exit 1
     fi
 
-    if [[ "$OSNAME" == "Rocky" ]] && [[ "$OSVERSION" != "8" ]]; then
-        printfail "Only Rocky Linux 8 supported"
+    if [[ "$OSNAME" == "Rocky" ]] && [[ ! "$OSVERSION" =~ ^(8|9)$ ]]; then
+        printfail "Only Rocky Linux 8/9 supported"
         exit 1
     fi