diff --git a/config/config.exs b/config/config.exs
index 475c20d..d364a42 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -1,6 +1,6 @@
 # This file is responsible for configuring your application
 # and its dependencies with the aid of the Mix.Config module.
-use Mix.Config
+import Config
 
 # This configuration is loaded before any dependency and is restricted
 # to this project. If another project depends on this project, this
diff --git a/lib/exkml.ex b/lib/exkml.ex
index 9246900..16625c3 100644
--- a/lib/exkml.ex
+++ b/lib/exkml.ex
@@ -132,6 +132,11 @@ defmodule Exkml do
         key   = String.trim(chars)
         value = String.trim(value)
 
+        value = case value do
+          "" -> nil
+          v -> v
+        end
+
         {key, value}
     end
   end
diff --git a/lib/exkml/stage.ex b/lib/exkml/stage.ex
index 343b077..ca7d8d8 100644
--- a/lib/exkml/stage.ex
+++ b/lib/exkml/stage.ex
@@ -1,5 +1,4 @@
 defmodule Exkml.Stage do
-  alias Experimental.GenStage
   use GenStage
 
   def start_link(binstream, chunk_size) do
diff --git a/mix.exs b/mix.exs
index 1b14c51..d7be1a4 100644
--- a/mix.exs
+++ b/mix.exs
@@ -38,8 +38,8 @@ defmodule Exkml.Mixfile do
   defp deps do
     [
       {:ex_doc, ">= 0.0.0", only: :dev},
-      {:gen_stage, "~> 0.8.0"},
-      {:saxy, "~> 0.9.1"}
+      {:gen_stage, "~> 1.0"},
+      {:saxy, "~> 1.6"}
     ]
   end
 end
diff --git a/mix.lock b/mix.lock
index d68d386..06138e7 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,9 +1,11 @@
 %{
-  "earmark": {:hex, :earmark, "1.2.6", "b6da42b3831458d3ecc57314dff3051b080b9b2be88c2e5aa41cd642a5b044ed", [:mix], [], "hexpm"},
-  "ex_doc": {:hex, :ex_doc, "0.19.1", "519bb9c19526ca51d326c060cb1778d4a9056b190086a8c6c115828eaccea6cf", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.7", [hex: :makeup_elixir, repo: "hexpm", optional: false]}], "hexpm"},
-  "gen_stage": {:hex, :gen_stage, "0.8.0", "a76e3f0530f86fae8b8a1021c06527b1ec171cf4c0bdfecd8d5ad0376d1205af", [:mix], [], "hexpm"},
-  "makeup": {:hex, :makeup, "0.5.1", "966c5c2296da272d42f1de178c1d135e432662eca795d6dc12e5e8787514edf7", [:mix], [{:nimble_parsec, "~> 0.2.2", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm"},
-  "makeup_elixir": {:hex, :makeup_elixir, "0.8.0", "1204a2f5b4f181775a0e456154830524cf2207cf4f9112215c05e0b76e4eca8b", [:mix], [{:makeup, "~> 0.5.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 0.2.2", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm"},
-  "nimble_parsec": {:hex, :nimble_parsec, "0.2.2", "d526b23bdceb04c7ad15b33c57c4526bf5f50aaa70c7c141b4b4624555c68259", [:mix], [], "hexpm"},
-  "saxy": {:hex, :saxy, "0.9.1", "96571a31b513a06903b2c4ae3ef8d0b30c92f67fb14ec47c26f489d4def677ac", [:mix], [], "hexpm"},
+  "earmark": {:hex, :earmark, "1.2.6", "b6da42b3831458d3ecc57314dff3051b080b9b2be88c2e5aa41cd642a5b044ed", [:mix], [], "hexpm", "b42a23e9bd92d65d16db2f75553982e58519054095356a418bb8320bbacb58b1"},
+  "earmark_parser": {:hex, :earmark_parser, "1.4.44", "f20830dd6b5c77afe2b063777ddbbff09f9759396500cdbe7523efd58d7a339c", [:mix], [], "hexpm", "4778ac752b4701a5599215f7030989c989ffdc4f6df457c5f36938cc2d2a2750"},
+  "ex_doc": {:hex, :ex_doc, "0.38.4", "ab48dff7a8af84226bf23baddcdda329f467255d924380a0cf0cee97bb9a9ede", [:mix], [{:earmark_parser, "~> 1.4.44", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.0", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14 or ~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1 or ~> 1.0", [hex: :makeup_erlang, repo: "hexpm", optional: false]}, {:makeup_html, ">= 0.1.0", [hex: :makeup_html, repo: "hexpm", optional: true]}], "hexpm", "f7b62346408a83911c2580154e35613eb314e0278aeea72ed7fedef9c1f165b2"},
+  "gen_stage": {:hex, :gen_stage, "1.3.2", "7c77e5d1e97de2c6c2f78f306f463bca64bf2f4c3cdd606affc0100b89743b7b", [:mix], [], "hexpm", "0ffae547fa777b3ed889a6b9e1e64566217413d018cabd825f786e843ffe63e7"},
+  "makeup": {:hex, :makeup, "1.2.1", "e90ac1c65589ef354378def3ba19d401e739ee7ee06fb47f94c687016e3713d1", [:mix], [{:nimble_parsec, "~> 1.4", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "d36484867b0bae0fea568d10131197a4c2e47056a6fbe84922bf6ba71c8d17ce"},
+  "makeup_elixir": {:hex, :makeup_elixir, "1.0.1", "e928a4f984e795e41e3abd27bfc09f51db16ab8ba1aebdba2b3a575437efafc2", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "7284900d412a3e5cfd97fdaed4f5ed389b8f2b4cb49efc0eb3bd10e2febf9507"},
+  "makeup_erlang": {:hex, :makeup_erlang, "1.0.2", "03e1804074b3aa64d5fad7aa64601ed0fb395337b982d9bcf04029d68d51b6a7", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "af33ff7ef368d5893e4a267933e7744e46ce3cf1f61e2dccf53a111ed3aa3727"},
+  "nimble_parsec": {:hex, :nimble_parsec, "1.4.2", "8efba0122db06df95bfaa78f791344a89352ba04baedd3849593bfce4d0dc1c6", [:mix], [], "hexpm", "4b21398942dda052b403bbe1da991ccd03a053668d147d53fb8c4e0efe09c973"},
+  "saxy": {:hex, :saxy, "1.6.0", "02cb4e9bd045f25ac0c70fae8164754878327ee393c338a090288210b02317ee", [:mix], [], "hexpm", "ef42eb4ac983ca77d650fbdb68368b26570f6cc5895f0faa04d34a6f384abad3"},
 }
diff --git a/test/exkml_test.exs b/test/exkml_test.exs
index 4f26535..87a8107 100644
--- a/test/exkml_test.exs
+++ b/test/exkml_test.exs
@@ -349,7 +349,6 @@ defmodule ExkmlTest do
     {"wards", [Polygon, Multigeometry], 53}
   ], fn {name, kinds, expected_length} ->
     test "smoke #{name}" do
-      alias Experimental.GenStage
       expected_set = MapSet.new(unquote(kinds))
 
       "smoke/#{unquote(name)}"