diff --git a/.github/autobuild/ios.sh b/.github/autobuild/ios.sh
index ab52c8d0da..c5903f4045 100755
--- a/.github/autobuild/ios.sh
+++ b/.github/autobuild/ios.sh
@@ -61,6 +61,11 @@ setup() {
             # As of aqtinstall 2.1.0 / 04/2022, desktop qtbase has to be installed manually:
             python3 -m aqt install-qt --outputdir "${QT_DIR}" mac desktop "${QT_VERSION}" --archives qtbase
         fi
+
+        # Suppress deprecation of Legacy Build System for now.
+        # TODO: Legacy Build System is removed in xcode 14. Need to migrate
+        # to the Modern Build System instead.
+        /usr/libexec/PlistBuddy -c "Add :DisableBuildSystemDeprecationDiagnostic bool true" /usr/local/opt/qt/"${QT_VERSION}"/ios/mkspecs/macx-xcode/WorkspaceSettings.xcsettings
     fi
 }
 
diff --git a/.github/workflows/autobuild.yml b/.github/workflows/autobuild.yml
index b839360822..5627da3942 100644
--- a/.github/workflows/autobuild.yml
+++ b/.github/workflows/autobuild.yml
@@ -250,7 +250,7 @@ jobs:
 
           - config_name:            iOS (artifacts)
             target_os:              ios
-            building_on_os:         macos-11
+            building_on_os:         macos-12
             base_command:           QT_VERSION=5.15.2 ./.github/autobuild/ios.sh
             # Build failed with CodeQL enabled when last tested 03/2022 (#2490).
             # There are no hints that iOS is supposed to be supported by CodeQL.
@@ -258,7 +258,7 @@ jobs:
             run_codeql:             false
             # Unfortunately, more modern Xcode versions no longer seem to support
             # Qt 5.15.2. Therefore upgrading to Qt6 is needed in the medium term (#2711)
-            xcode_version:          12.5.1
+            xcode_version:          13.4.1
 
           - config_name:            Windows (artifact+codeQL)
             target_os:              windows