diff --git a/mix.exs b/mix.exs
index a61648c..65fdd70 100644
--- a/mix.exs
+++ b/mix.exs
@@ -6,6 +6,8 @@ defmodule Predicator.MixProject do
   @description "A secure, non-evaling condition (boolean predicate) engine for end users"
   @source_url "https://github.com/riddler/predicator-ex"
   @deps [
+    {:jason, "~> 1.4"},
+
     # Development and testing
     {:castore, "~> 1.0", only: [:dev, :test]},
     {:dialyxir, "~> 1.4", only: [:dev, :test], runtime: false},