diff --git a/Library/Homebrew/cask/audit.rb b/Library/Homebrew/cask/audit.rb
index 3f714edc66..c89aa6f06d 100644
--- a/Library/Homebrew/cask/audit.rb
+++ b/Library/Homebrew/cask/audit.rb
@@ -550,7 +550,7 @@ module Cask
       return unless cask.livecheckable?
       return unless cask.livecheck.strategy == :sparkle
 
-      out, _, status = curl_output(cask.livecheck.url)
+      out, _, status = curl_output("--fail", "--silent", "--location", cask.livecheck.url)
       return unless status.success?
 
       require "rexml/document"
@@ -563,14 +563,19 @@ module Cask
 
       return if xml.blank?
 
-      item = xml.get_elements("//rss//channel//item").first
+      item = xml.elements["//rss//channel//item"]
       return if item.blank?
 
-      min_os = item.elements["sparkle:minimumSystemVersion"].text
+      min_os = item.elements["sparkle:minimumSystemVersion"]&.text
       return if min_os.blank?
 
-      min_os_string = OS::Mac::Version.new(min_os).strip_patch
-      cask_min_os = cask.depends_on.macos.version
+      begin
+        min_os_string = OS::Mac::Version.new(min_os).strip_patch
+      rescue MacOSVersionError
+        return
+      end
+
+      cask_min_os = cask.depends_on.macos&.version
 
       return if cask_min_os == min_os_string
 
diff --git a/Library/Homebrew/cask/dsl/depends_on.rb b/Library/Homebrew/cask/dsl/depends_on.rb
index 1d4e3a2448..c4b1af7207 100644
--- a/Library/Homebrew/cask/dsl/depends_on.rb
+++ b/Library/Homebrew/cask/dsl/depends_on.rb
@@ -11,6 +11,7 @@ module Cask
     #
     # @api private
     class DependsOn < SimpleDelegator
+      extend T::Sig
       VALID_KEYS = Set.new([
         :formula,
         :cask,
@@ -49,6 +50,7 @@ module Cask
         @cask.concat(args)
       end
 
+      sig { params(args: String).returns(T.nilable(MacOSRequirement)) }
       def macos=(*args)
         raise "Only a single 'depends_on macos' is allowed." if defined?(@macos)