diff --git a/lib/main_proxy.ex b/lib/main_proxy.ex
index 23a33ed..3c561b5 100644
--- a/lib/main_proxy.ex
+++ b/lib/main_proxy.ex
@@ -62,7 +62,7 @@ defmodule MainProxy do
         backends
 
       :error ->
-        Logger.warn(
+        Logger.warning(
           "No backends specified. Either configure :main_proxy, :backends or define a " <>
             "`backend/0` function in your `Proxy` module."
         )
diff --git a/mix.exs b/mix.exs
index d01f3a9..729b4d3 100644
--- a/mix.exs
+++ b/mix.exs
@@ -8,7 +8,7 @@ defmodule MainProxy.MixProject do
       description:
         "Proxies requests to multiple apps. Useful for Gigalixir or Heroku deployment when just one web port is exposed. Works with phoenix endpoints, plugs, and websockets.",
       package: package(),
-      elixir: "~> 1.9",
+      elixir: "~> 1.11",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
       deps: deps(),