diff --git a/infra/config/global/cr-buildbucket.cfg b/infra/config/global/cr-buildbucket.cfg
index c5d47f7821..1d4532572d 100644
--- a/infra/config/global/cr-buildbucket.cfg
+++ b/infra/config/global/cr-buildbucket.cfg
@@ -72,7 +72,7 @@ builder_mixins {
 }
 builder_mixins {
   name: "mac"
-  dimensions: "os:Mac-10.13"
+  dimensions: "os:Mac-10.15"
   caches: {   # cache for depot_tools.osx_sdk recipe module
     name: "osx_sdk"
     path: "osx_sdk"
@@ -80,7 +80,7 @@ builder_mixins {
   recipe {
     properties_j: <<EOF
       $depot_tools/osx_sdk:{
-        "sdk_version": "10b61"
+        "sdk_version": "11b52"
       }
     EOF
   }