diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 6d9888eb5..60ccc2f3d 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -64,8 +64,6 @@ jobs:
 - job: MacOS
   strategy:
     matrix:
-      sierra:
-        image: macOS-10.13
       mojave:
         image: macOS-10.14