diff --git a/.cirrus.yml b/.cirrus.yml
index f016f26..1eddb3a 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -11,7 +11,7 @@ env:
 
 task:
   name: "Update Vanilla Images"
-  only_if: false
+  only_if: $CIRRUS_BRANCH == $CIRRUS_DEFAULT_BRANCH && changesInclude("templates/vanilla-sonoma.pkr.hcl")
   timeout_in: 3h
   update_script: brew update && brew upgrade
   info_script:
diff --git a/templates/vanilla-sonoma.pkr.hcl b/templates/vanilla-sonoma.pkr.hcl
index f8f3461..4d665b3 100644
--- a/templates/vanilla-sonoma.pkr.hcl
+++ b/templates/vanilla-sonoma.pkr.hcl
@@ -8,7 +8,7 @@ packer {
 }
 
 source "tart-cli" "tart" {
-  from_ipsw    = "https://updates.cdn-apple.com/2023FallFCS/fullrestores/042-86430/DBE44960-58A6-4715-948B-D64F33F769BD/UniversalMac_14.1_23B74_Restore.ipsw"
+  from_ipsw    = "https://updates.cdn-apple.com/2024WinterFCS/fullrestores/042-78241/B45074EB-2891-4C05-BCA4-7463F3AC0982/UniversalMac_14.3_23D56_Restore.ipsw"
   vm_name      = "sonoma-vanilla"
   cpu_count    = 4
   memory_gb    = 8