diff --git a/mix.exs b/mix.exs
index b0ffa2ac..12e003cf 100644
--- a/mix.exs
+++ b/mix.exs
@@ -81,7 +81,7 @@ defmodule SignDict.Mixfile do
       {:phoenix_pubsub, "~> 1.0"},
       {:phoenix, "~> 1.4.1"},
       {:plug, "~> 1.13.3"},
-      {:postgrex, "~> 0.15.0"},
+      {:postgrex, "~> 0.16.4"},
       {:recaptcha, "~> 3.0.0"},
       {:scrivener_ecto, "~> 2.7.0"},
       {:scrivener_html, "~> 1.7"},
diff --git a/mix.lock b/mix.lock
index 45b6441b..e8765c67 100644
--- a/mix.lock
+++ b/mix.lock
@@ -68,7 +68,7 @@
   "plugsnag": {:hex, :plugsnag, "1.6.1", "4d051770bc0835f66175bb0cc7b507b5002815024066fdaa7f2a7e2bf8cb34d1", [:mix], [{:bugsnag, "~> 1.3 or ~> 2.0 or ~> 3.0", [hex: :bugsnag, repo: "hexpm", optional: false]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "65cdce8ed718b10346d9ac9e063aa55a28fff7c554fccb8aff3cf38b4d4620b3"},
   "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm", "fec8660eb7733ee4117b85f55799fd3833eb769a6df71ccf8903e8dc5447cfce"},
   "poolboy": {:hex, :poolboy, "1.5.2", "392b007a1693a64540cead79830443abf5762f5d30cf50bc95cb2c1aaafa006b", [:rebar3], [], "hexpm", "dad79704ce5440f3d5a3681c8590b9dc25d1a561e8f5a9c995281012860901e3"},
-  "postgrex": {:hex, :postgrex, "0.15.13", "7794e697481799aee8982688c261901de493eb64451feee6ea58207d7266d54a", [:mix], [{:connection, "~> 1.0", [hex: :connection, repo: "hexpm", optional: false]}, {:db_connection, "~> 2.1", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.5 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "3ffb76e1a97cfefe5c6a95632a27ffb67f28871c9741fb585f9d1c3cd2af70f1"},
+  "postgrex": {:hex, :postgrex, "0.16.4", "26d998467b4a22252285e728a29d341e08403d084e44674784975bb1cd00d2cb", [:mix], [{:connection, "~> 1.1", [hex: :connection, repo: "hexpm", optional: false]}, {:db_connection, "~> 2.1", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.5 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:table, "~> 0.1.0", [hex: :table, repo: "hexpm", optional: true]}], "hexpm", "3234d1a70cb7b1e0c95d2e242785ec2a7a94a092bbcef4472320b950cfd64c5f"},
   "ranch": {:hex, :ranch, "1.8.0", "8c7a100a139fd57f17327b6413e4167ac559fbc04ca7448e9be9057311597a1d", [:make, :rebar3], [], "hexpm", "49fbcfd3682fab1f5d109351b61257676da1a2fdbe295904176d5e521a2ddfe5"},
   "recaptcha": {:hex, :recaptcha, "3.0.0", "9c4d3ee688d69605d6de9629f0ae51670748d023f7b5700d0fe788877932c95c", [:mix], [{:httpoison, ">= 0.12.0", [hex: :httpoison, repo: "hexpm", optional: false]}, {:poison, "~> 3.1.0 or ~> 2.2.0 or ~> 1.5.2", [hex: :poison, repo: "hexpm", optional: true]}], "hexpm", "894b2a8d7ce2cf22145fa8b900379f78478f9a652960f56aec280352d8467d1c"},
   "redix": {:hex, :redix, "1.1.5", "6fc460d66a5c2287e83e6d73dddc8d527ff59cb4d4f298b41e03a4db8c3b2bd5", [:mix], [{:castore, "~> 0.1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.0 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "679afdd4c14502fe9c11387ff1cdcb33065a1cf511097da1eee407f17c7a418b"},