diff --git a/.ci/cirrus.runner.yml b/.ci/cirrus.runner.yml
index d7b7add..3553966 100644
--- a/.ci/cirrus.runner.yml
+++ b/.ci/cirrus.runner.yml
@@ -1,6 +1,7 @@
 task:
   name: "Update Runner Image ($MACOS_VERSION)"
   env:
+    ADDITIONAL_RUNTIMES: "\"iOS 16.4\""
     matrix:
       - MACOS_VERSION: sonoma
         XCODE_VERSIONS: 15.2,15.3,15.4,16
@@ -10,9 +11,14 @@ task:
   <<: *defaults
   pull_base_script:
     - tart pull ghcr.io/cirruslabs/macos-$MACOS_VERSION-base:latest
-  build_xcode_script:
-    - packer init templates/xcode.pkr.hcl
-    - packer build -var tag=runner -var disk_size=300 -var disk_free_mb=100000 -var macos_version="$MACOS_VERSION" -var xcode_version="[$XCODE_VERSIONS]"  templates/xcode.pkr.hcl
+  init_xcode_script: packer init templates/xcode.pkr.hcl
+  build_xcode_script: |
+      packer build -var tag=runner -var disk_size=300 \
+        -var disk_free_mb=100000 \
+        -var macos_version="$MACOS_VERSION" \
+        -var xcode_version="[$XCODE_VERSIONS]" \
+        -var additional_runtimes="[$ADDITIONAL_RUNTIMES]" \
+        templates/xcode.pkr.hcl
   push_script: |
     tart push "$MACOS_VERSION-xcode:runner" ghcr.io/cirruslabs/macos-runner:$MACOS_VERSION
   always: