diff --git a/macos-guest-virtualbox.sh b/macos-guest-virtualbox.sh
index 54d1158..de4a495 100755
--- a/macos-guest-virtualbox.sh
+++ b/macos-guest-virtualbox.sh
@@ -289,7 +289,7 @@ fi
 # set Apple software update catalog URL according to macOS version
 HighSierra_sucatalog='https://swscan.apple.com/content/catalogs/others/index-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog'
 Mojave_sucatalog='https://swscan.apple.com/content/catalogs/others/index-10.14-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog'
-Catalina_sucatalog='https://swscan.apple.com/content/catalogs/others/index-10.15-10.15-10.14-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog'
+Catalina_sucatalog='https://swscan.apple.com/content/catalogs/others/index-10.15-10.14-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog'
 if [[ "${macOS_release_name:0:1}" =~ [Cc] ]]; then
     macOS_release_name="Catalina"
     CFBundleShortVersionString="10.15"