diff --git a/mix.exs b/mix.exs
index a76710d..128983c 100644
--- a/mix.exs
+++ b/mix.exs
@@ -43,7 +43,7 @@ defmodule EctoInterval.Mixfile do
   defp deps do
     [
       {:ex_doc, ">= 0.0.0", only: :dev},
-      {:postgrex, "~> 0.14.0 or ~> 0.15.0 or ~> 0.16.0 or ~> 0.17.0 or ~> 0.18.0 or ~> 0.19.0", optional: true},
+      {:postgrex, "~> 0.14.0 or ~> 0.15.0 or ~> 0.16.0 or ~> 0.17.0 or ~> 0.18.0 or ~> 0.19.0 or ~> 0.20.0", optional: true},
       {:ecto, "~> 3.0", optional: true},
       {:phoenix_html, "~> 3.0", optional: true}
     ]