diff --git a/.tool-versions b/.tool-versions
index 188fe16..e3b5de3 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-elixir 1.5.2
+elixir 1.6.0
 python 2.7.14
diff --git a/mix.exs b/mix.exs
index e983a35..0772c2b 100644
--- a/mix.exs
+++ b/mix.exs
@@ -5,7 +5,7 @@ defmodule Chess.Mixfile do
     [
       app: :chess,
       version: "0.1.0",
-      elixir: "~> 1.5",
+      elixir: "~> 1.6",
       elixirc_paths: elixirc_paths(Mix.env),
       compilers: [:phoenix, :gettext] ++ Mix.compilers,
       build_embedded: Mix.env == :prod,