diff --git a/scripts/upgrade b/scripts/upgrade
index 52aa830..1493a58 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -136,7 +136,7 @@ function list_installed_apps_not_compatible_with_future_version()
 }
 
 
-last_version=$(ynh_read_manifest --manifest_key="resources.sources.main.url" | grep -o '[0-9][0-9]\.[0-9]\.[0-9]')
+last_version=$(ynh_read_manifest --manifest_key="resources.sources.main.url" | grep -o '[0-9][0-9]\.[0-9]\.[0-9][0-9]')
 last_major_version=${last_version%%.*}
 
 if [[ "$last_major_version" != "$current_major_version" ]]