diff --git a/scripts/nightly.yaml b/scripts/nightly.yaml
index f8bb7e447..20ba54a99 100644
--- a/scripts/nightly.yaml
+++ b/scripts/nightly.yaml
@@ -27,7 +27,7 @@ stages:
   - job: MacArm64
     displayName: "Mac ARM64 Build"
     pool:
-      vmImage: "macOS-latest"
+      vmImage: "macOS-12"
     steps:
     - script: python scripts/mk_unix_dist.py --dotnet-key=$(Build.SourcesDirectory)/resources/z3.snk --arch=arm64 --nojava
     - script: git clone https://github.com/z3prover/z3test z3test