diff --git a/test/wayfarer/server/plug_test.exs b/test/wayfarer/server/plug_test.exs
index 6a8cdaa..78b6f61 100644
--- a/test/wayfarer/server/plug_test.exs
+++ b/test/wayfarer/server/plug_test.exs
@@ -1,6 +1,6 @@
 defmodule Wayfarer.Server.PlugTest do
   @moduledoc false
-  use ExUnit.Case, async: true
+  use ExUnit.Case, async: false
   use Mimic
   use Plug.Test
   use Support.PortTracker
diff --git a/test/wayfarer/target/selector_test.exs b/test/wayfarer/target/selector_test.exs
index 2b6c7ff..b5ec671 100644
--- a/test/wayfarer/target/selector_test.exs
+++ b/test/wayfarer/target/selector_test.exs
@@ -1,6 +1,6 @@
 defmodule Wayfarer.Target.SelectorTest do
   @moduledoc false
-  use ExUnit.Case, async: true
+  use ExUnit.Case, async: false
   use Plug.Test
   use Mimic
   use Support.PortTracker