diff --git a/.azure/azure-pipelines.yml b/.azure/azure-pipelines.yml
index 038345194b..99f5348412 100644
--- a/.azure/azure-pipelines.yml
+++ b/.azure/azure-pipelines.yml
@@ -10,7 +10,7 @@ strategy:
       image: ubuntu-16.04
       toolchain: nightly-$(lkg-rust-nightly)
     macos-nightly:
-      image: macos-10.13
+      image: macos-10.14
       toolchain: nightly-$(lkg-rust-nightly)
     windows-nightly:
       image: vs2017-win2016