diff --git a/rules/chrome.json b/rules/chrome.json
index 01254b5..731d208 100644
--- a/rules/chrome.json
+++ b/rules/chrome.json
@@ -35,7 +35,7 @@
         {
           "os": "linux",
           "distribution": "ubuntu",
-          "versions": "20.04"
+          "versions": ["20.04"]
         }
       ]
     },