diff --git a/eng/pipelines/templates/build-machine-matrix.yml b/eng/pipelines/templates/build-machine-matrix.yml
index 71ffc558754..54959482b49 100644
--- a/eng/pipelines/templates/build-machine-matrix.yml
+++ b/eng/pipelines/templates/build-machine-matrix.yml
@@ -151,9 +151,9 @@ jobs:
     parameters:
       osGroup: osx
       archType: x64
-      osVersion: 15
+      osVersion: 26
       pool:
-        vmImage: 'macos-15'
+        vmImage: 'macos-26'
       queue: Mac.iPhone.17.Perf
       machinePool: iPhone17
       ${{ insert }}: ${{ parameters.jobParameters }}