diff --git a/renovate.json b/renovate.json
index ef8151d..3f51a32 100644
--- a/renovate.json
+++ b/renovate.json
@@ -15,7 +15,7 @@
         "^Chart\\.yaml$"
       ],
       "matchStrings": [
-        "appVersion: \"(?<currentValue>.*?)\"\\s+"
+        "^appVersion: \"?(?<currentValue>[^\"\\s]+)\"?\\s*$"
       ],
       "datasourceTemplate": "docker",
       "depNameTemplate": "prometheuscommunity/postgres-exporter",