diff --git a/infra/bots/gen_tasks.go b/infra/bots/gen_tasks.go
index 616acc44a8..9d9efe97de 100644
--- a/infra/bots/gen_tasks.go
+++ b/infra/bots/gen_tasks.go
@@ -188,10 +188,6 @@ func defaultSwarmDimensions(parts map[string]string) []string {
 		if parts["model"] == "Golo" && os == "Win10" && parts["cpu_or_gpu_value"] == "GT610" {
 			d["os"] = "Windows-10-10586"
 		}
-		// This machine hasn't been upgraded yet.
-		if parts["model"] == "MacMini7.1" && os == "Mac" && parts["cpu_or_gpu"] == "CPU" {
-			d["os"] = "Mac-10.11"
-		}
 	} else {
 		d["os"] = DEFAULT_OS_DEBIAN
 	}
diff --git a/infra/bots/tasks.json b/infra/bots/tasks.json
index 51736eeda2..8bfba4f728 100644
--- a/infra/bots/tasks.json
+++ b/infra/bots/tasks.json
@@ -7707,7 +7707,7 @@
       "dimensions": [
         "cpu:x86-64",
         "gpu:none",
-        "os:Mac-10.11",
+        "os:Mac-10.12",
         "pool:Skia"
       ],
       "execution_timeout_ns": 14400000000000,
@@ -7755,7 +7755,7 @@
       "dimensions": [
         "cpu:x86-64",
         "gpu:none",
-        "os:Mac-10.11",
+        "os:Mac-10.12",
         "pool:Skia"
       ],
       "execution_timeout_ns": 14400000000000,
@@ -15097,7 +15097,7 @@
       "dimensions": [
         "cpu:x86-64",
         "gpu:none",
-        "os:Mac-10.11",
+        "os:Mac-10.12",
         "pool:Skia"
       ],
       "execution_timeout_ns": 14400000000000,
@@ -15145,7 +15145,7 @@
       "dimensions": [
         "cpu:x86-64",
         "gpu:none",
-        "os:Mac-10.11",
+        "os:Mac-10.12",
         "pool:Skia"
       ],
       "execution_timeout_ns": 14400000000000,