diff --git a/mix.exs b/mix.exs
index f8013f9..0b42054 100644
--- a/mix.exs
+++ b/mix.exs
@@ -60,7 +60,7 @@ defmodule ProtocolEx.Mixfile do
       {:ex_doc, ">= 0.19.0-rc", only: [:dev]},
       #{:ex_doc_makeup, ">= 0.1.0", only: [:dev]},
       # Testing only
-      {:cortex, "~> 0.5.0", only: [:test]},
+      {:cortex, "~> 0.6.0", only: [:test]},
       {:benchee, "~> 0.14.0", only: [:test]},
       {:numbers, "~> 5.1", only: [:test]},
       {:decimal, "~> 1.3", only: [:test]}
diff --git a/mix.lock b/mix.lock
index a66a7d5..c72397e 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,7 +1,7 @@
 %{
   "benchee": {:hex, :benchee, "0.14.0", "f771f587c48b4824b497e2a3e374f75e93ef01fc329873b089a3f5dd961b80b8", [:mix], [{:deep_merge, "~> 0.1", [hex: :deep_merge, repo: "hexpm", optional: false]}], "hexpm", "d4ccc9e6b5673c62bb95ca53fb7a7ee7f4f4d94b9f0e8f88b1ef08bfd7d2213d"},
   "coerce": {:hex, :coerce, "1.0.1", "211c27386315dc2894ac11bc1f413a0e38505d808153367bd5c6e75a4003d096", [:mix], [], "hexpm", "b44a691700f7a1a15b4b7e2ff1fa30bebd669929ac8aa43cffe9e2f8bf051cf1"},
-  "cortex": {:hex, :cortex, "0.5.0", "7b12ddcfa9fd61521dd3b841ef8a4758ccab895d6a5d4ed181a5a8ad4b4592a4", [:mix], [{:file_system, "~> 0.2", [hex: :file_system, repo: "hexpm", optional: false]}], "hexpm", "3352cd4c67d7cc3cf0c2858bea48c0112c255cdfb665e6d9393a47328c36aa42"},
+  "cortex": {:hex, :cortex, "0.6.0", "8094830fae266eb0ae34d1a58983c0c49484341f5044fb4dfb81746647bd2993", [:mix], [{:file_system, "~> 0.2", [hex: :file_system, repo: "hexpm", optional: false]}], "hexpm", "d0ef5a2b1269626149118684dc4ea77dbfbc67017f4b4065b71dcefa26cfcc49"},
   "decimal": {:hex, :decimal, "1.9.0", "83e8daf59631d632b171faabafb4a9f4242c514b0a06ba3df493951c08f64d07", [:mix], [], "hexpm", "b1f2343568eed6928f3e751cf2dffde95bfaa19dd95d09e8a9ea92ccfd6f7d85"},
   "deep_merge": {:hex, :deep_merge, "0.2.0", "c1050fa2edf4848b9f556fba1b75afc66608a4219659e3311d9c9427b5b680b3", [:mix], [], "hexpm", "e3bf435a54ed27b0ba3a01eb117ae017988804e136edcbe8a6a14c310daa966e"},
   "earmark": {:hex, :earmark, "1.3.1", "73812f447f7a42358d3ba79283cfa3075a7580a3a2ed457616d6517ac3738cb9", [:mix], [], "hexpm", "000aaeff08919e95e7aea13e4af7b2b9734577b3e6a7c50ee31ee88cab6ec4fb"},