diff --git a/metadata.json b/metadata.json
index b753d6c..17ca885 100644
--- a/metadata.json
+++ b/metadata.json
@@ -57,6 +57,12 @@
         "9"
       ]
     },
+    {
+      "operatingsystem": "CentOS",
+      "operatingsystemrelease": [
+        "9"
+      ]
+    },
     {
       "operatingsystem": "Scientific",
       "operatingsystemrelease": [