diff --git a/lib/tesla/middleware/logger.ex b/lib/tesla/middleware/logger.ex
index e88afc22..8057b523 100644
--- a/lib/tesla/middleware/logger.ex
+++ b/lib/tesla/middleware/logger.ex
@@ -182,7 +182,8 @@ defmodule Tesla.Middleware.Logger do
 
   alias Tesla.Middleware.Logger.Formatter
 
-  @config Application.get_env(:tesla, __MODULE__, [])
+  @config Application.compile_env(:tesla, __MODULE__, [])
+
   @format Formatter.compile(@config[:format])
 
   @type log_level :: :info | :warn | :error
diff --git a/lib/tesla/middleware/telemetry.ex b/lib/tesla/middleware/telemetry.ex
index 549058b2..8310064a 100644
--- a/lib/tesla/middleware/telemetry.ex
+++ b/lib/tesla/middleware/telemetry.ex
@@ -80,9 +80,8 @@ if Code.ensure_loaded?(:telemetry) do
     ```
     """
 
-    @disable_legacy_event Application.get_env(:tesla, Tesla.Middleware.Telemetry,
-                            disable_legacy_event: false
-                          )[:disable_legacy_event]
+    @disable_legacy_event Application.compile_env(:tesla, Tesla.Middleware.Telemetry,
+      disable_legacy_event: false)[:disable_legacy_event]
 
     @behaviour Tesla.Middleware
 
@@ -142,7 +141,7 @@ if Code.ensure_loaded?(:telemetry) do
     end
 
     if @disable_legacy_event do
-      defp emit_legacy_event(duration, result) do
+      defp emit_legacy_event(_duration, _result) do
         :ok
       end
     else
diff --git a/mix.exs b/mix.exs
index 41118e0b..f956abf9 100644
--- a/mix.exs
+++ b/mix.exs
@@ -2,7 +2,7 @@ defmodule Tesla.Mixfile do
   use Mix.Project
 
   @source_url "https://github.com/teamon/tesla"
-  @version "1.6.1"
+  @version "1.7.0"
 
   def project do
     [
@@ -10,7 +10,7 @@ defmodule Tesla.Mixfile do
       version: @version,
       description: description(),
       package: package(),
-      elixir: "~> 1.7",
+      elixir: "~> 1.10",
       elixirc_paths: elixirc_paths(Mix.env()),
       deps: deps(),
       lockfile: lockfile(System.get_env("LOCKFILE")),