diff --git a/config/config.exs b/config/config.exs
index 3917628..b377652 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -75,6 +75,8 @@ config :parrhesia, Parrhesia.Web.MetricsEndpoint,
   ip: {127, 0, 0, 1},
   port: 9568
 
+config :parrhesia, Parrhesia.Repo, types: Parrhesia.PostgresTypes
+
 config :parrhesia, ecto_repos: [Parrhesia.Repo]
 
 import_config "#{config_env()}.exs"
diff --git a/lib/parrhesia/postgres_types.ex b/lib/parrhesia/postgres_types.ex
new file mode 100644
index 0000000..1fdaecd
--- /dev/null
+++ b/lib/parrhesia/postgres_types.ex
@@ -0,0 +1 @@
+Postgrex.Types.define(Parrhesia.PostgresTypes, [], json: JSON)