diff --git a/mix.exs b/mix.exs
index 91d0a9cff..a8d7b983e 100644
--- a/mix.exs
+++ b/mix.exs
@@ -91,7 +91,8 @@ defmodule Screens.MixProject do
       {:remote_ip, "~> 1.2"},
       {:hackney_telemetry, "~> 0.2.0"},
       {:ex_cldr_messages, "~> 1.0"},
-      {:server_sent_event_stage, "~> 1.2"}
+      {:server_sent_event_stage, "~> 1.2"},
+      {:mox, "~> 1.1", only: :test}
     ]
   end
 end
diff --git a/mix.lock b/mix.lock
index e55bf4556..28c017ff8 100644
--- a/mix.lock
+++ b/mix.lock
@@ -42,6 +42,7 @@
   "mimerl": {:hex, :mimerl, "1.3.0", "d0cd9fc04b9061f82490f6581e0128379830e78535e017f7780f37fea7545726", [:rebar3], [], "hexpm", "a1e15a50d1887217de95f0b9b0793e32853f7c258a5cd227650889b38839fe9d"},
   "mint": {:hex, :mint, "1.6.2", "af6d97a4051eee4f05b5500671d47c3a67dac7386045d87a904126fd4bbcea2e", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1 or ~> 0.2.0 or ~> 1.0", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "5ee441dffc1892f1ae59127f74afe8fd82fda6587794278d924e4d90ea3d63f9"},
   "mix_test_watch": {:hex, :mix_test_watch, "1.2.0", "1f9acd9e1104f62f280e30fc2243ae5e6d8ddc2f7f4dc9bceb454b9a41c82b42", [:mix], [{:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}], "hexpm", "278dc955c20b3fb9a3168b5c2493c2e5cffad133548d307e0a50c7f2cfbf34f6"},
+  "mox": {:hex, :mox, "1.1.0", "0f5e399649ce9ab7602f72e718305c0f9cdc351190f72844599545e4996af73c", [:mix], [], "hexpm", "d44474c50be02d5b72131070281a5d3895c0e7a95c780e90bc0cfe712f633a13"},
   "nebulex": {:hex, :nebulex, "2.6.3", "78af348ed9f8a338871b41e0b6de718c1808e627ce03fbe86598cbda2bdda2f5", [:mix], [{:decorator, "~> 1.4", [hex: :decorator, repo: "hexpm", optional: true]}, {:shards, "~> 1.1", [hex: :shards, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: true]}], "hexpm", "09cdcbb62f8463ffcec7cae4936425ce91e25d92a6cd37e48b5dda7c851958d5"},
   "nimble_options": {:hex, :nimble_options, "1.1.1", "e3a492d54d85fc3fd7c5baf411d9d2852922f66e69476317787a7b2bb000a61b", [:mix], [], "hexpm", "821b2470ca9442c4b6984882fe9bb0389371b8ddec4d45a9504f00a66f650b44"},
   "nimble_ownership": {:hex, :nimble_ownership, "0.3.1", "99d5244672fafdfac89bfad3d3ab8f0d367603ce1dc4855f86a1c75008bce56f", [:mix], [], "hexpm", "4bf510adedff0449a1d6e200e43e57a814794c8b5b6439071274d248d272a549"},