diff --git a/mix.exs b/mix.exs
index 850d0c3..c00ea8f 100644
--- a/mix.exs
+++ b/mix.exs
@@ -26,6 +26,7 @@ defmodule Til.MixProject do
     [
       # {:dep_from_hexpm, "~> 0.3.0"},
       # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+      {:jason, "~> 1.4"},
       {:ex_unit_summary, "~> 0.1.0", only: [:dev, :test]}
     ]
   end
diff --git a/mix.lock b/mix.lock
index 6645093..98138b0 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,3 +1,4 @@
 %{
   "ex_unit_summary": {:hex, :ex_unit_summary, "0.1.0", "7b0352afc5e6a933c805df0a539b66b392ac12ba74d8b208db7d83f77cb57049", [:mix], [], "hexpm", "8c87d0deade3657102902251d2ec60b5b94560004ce0e2c2fa5b466232716bd6"},
+  "jason": {:hex, :jason, "1.4.4", "b9226785a9aa77b6857ca22832cffa5d5011a667207eb2a0ad56adb5db443b8a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "c5eb0cab91f094599f94d55bc63409236a8ec69a21a67814529e8d5f6cc90b3b"},
 }