diff --git a/.travis.yml b/.travis.yml
index 7351e8d0..a28e3355 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,14 +4,16 @@ elixir:
   - 1.3
   - 1.4
   - 1.5
+  - 1.6
 otp_release:
   - 18.3
   - 19.3
   - 20.1
 matrix:
   exclude:
-    - elixir: 1.3
-      otp_release: 20.1
+    elixir: 1.3
+    otp_release: 20.1
+
 sudo: false
 env:
   global:
diff --git a/mix.exs b/mix.exs
index 2652e176..3519c95e 100644
--- a/mix.exs
+++ b/mix.exs
@@ -52,12 +52,12 @@ defmodule Stripe.Mixfile do
 
   defp deps do
     [
-      {:bypass, "~> 0.5", only: :test},
+      {:bypass, "~> 0.8.1", only: :test},
       {:dialyxir, "~> 0.5", only: [:dev], runtime: false},
-      {:earmark, "~> 1.0", only: :dev},
-      {:ex_doc, "~> 0.14", only: :dev},
-      {:excoveralls, "~> 0.5", only: :test},
-      {:hackney, "~> 1.6"},
+      {:earmark, "~> 1.2.5", only: :dev},
+      {:ex_doc, "~> 0.18.3", only: :dev},
+      {:excoveralls, "~> 0.8.1", only: :test},
+      {:hackney, "~> 1.12.1"},
       {:inch_ex, "~> 0.5", only: [:dev, :test]},
       {:poison, "~> 2.0 or ~> 3.0"},
       {:uri_query, "~> 0.1.2"},
diff --git a/mix.lock b/mix.lock
index 334f68e6..6b5e3a80 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,31 +1,35 @@
-%{"bypass": {:hex, :bypass, "0.5.1", "cf3e8a4d376ee1dcd89bf362dfaf1f4bf4a6e19895f52fdc2bafbd8207ce435f", [:mix], [{:cowboy, "~> 1.0", [hex: :cowboy, optional: false]}, {:plug, "~> 1.0", [hex: :plug, optional: false]}]},
-  "certifi": {:hex, :certifi, "0.4.0", "a7966efb868b179023618d29a407548f70c52466bf1849b9e8ebd0e34b7ea11f", [:rebar3], []},
-  "cowboy": {:hex, :cowboy, "1.0.4", "a324a8df9f2316c833a470d918aaf73ae894278b8aa6226ce7a9bf699388f878", [:rebar, :make], [{:cowlib, "~> 1.0.0", [hex: :cowlib, optional: false]}, {:ranch, "~> 1.0", [hex: :ranch, optional: false]}]},
+%{
+  "bypass": {:hex, :bypass, "0.8.1", "16d409e05530ece4a72fabcf021a3e5c7e15dcc77f911423196a0c551f2a15ca", [:mix], [{:cowboy, "~> 1.0", [hex: :cowboy, repo: "hexpm", optional: false]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm"},
+  "certifi": {:hex, :certifi, "2.3.1", "d0f424232390bf47d82da8478022301c561cf6445b5b5fb6a84d49a9e76d2639", [:rebar3], [{:parse_trans, "3.2.0", [hex: :parse_trans, repo: "hexpm", optional: false]}], "hexpm"},
+  "cowboy": {:hex, :cowboy, "1.1.2", "61ac29ea970389a88eca5a65601460162d370a70018afe6f949a29dca91f3bb0", [:rebar3], [{:cowlib, "~> 1.0.2", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "~> 1.3.2", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm"},
   "cowlib": {:hex, :cowlib, "1.0.2", "9d769a1d062c9c3ac753096f868ca121e2730b9a377de23dec0f7e08b1df84ee", [:make], []},
   "dialyxir": {:hex, :dialyxir, "0.5.1", "b331b091720fd93e878137add264bac4f644e1ddae07a70bf7062c7862c4b952", [:mix], []},
-  "earmark": {:hex, :earmark, "1.0.3", "89bdbaf2aca8bbb5c97d8b3b55c5dd0cff517ecc78d417e87f1d0982e514557b", [:mix], []},
+  "earmark": {:hex, :earmark, "1.2.5", "4d21980d5d2862a2e13ec3c49ad9ad783ffc7ca5769cf6ff891a4553fbaae761", [:mix], [], "hexpm"},
   "erlexec": {:hex, :erlexec, "1.7.1", "6ddbd40fa202084ed0bdaf95a50c334acaa5644ae213b903cd4094a78ae79734", [:rebar3], []},
-  "ex_doc": {:hex, :ex_doc, "0.14.3", "e61cec6cf9731d7d23d254266ab06ac1decbb7651c3d1568402ec535d387b6f7", [:mix], [{:earmark, "~> 1.0", [hex: :earmark, optional: false]}]},
+  "ex_doc": {:hex, :ex_doc, "0.18.3", "f4b0e4a2ec6f333dccf761838a4b253d75e11f714b85ae271c9ae361367897b7", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}], "hexpm"},
   "exactor": {:hex, :exactor, "2.2.1", "89bc6798f7ed5b5a090f8e4a0b6997478a3266e831d2ff31677ac764ffa75973", [:mix], []},
-  "excoveralls": {:hex, :excoveralls, "0.5.5", "d97b6fc7aa59c5f04f2fa7ec40fc0b7555ceea2a5f7e7c442aad98ddd7f79002", [:mix], [{:exjsx, "~> 3.0", [hex: :exjsx, optional: false]}, {:hackney, ">= 0.12.0", [hex: :hackney, optional: false]}]},
+  "excoveralls": {:hex, :excoveralls, "0.8.1", "0bbf67f22c7dbf7503981d21a5eef5db8bbc3cb86e70d3798e8c802c74fa5e27", [:mix], [{:exjsx, ">= 3.0.0", [hex: :exjsx, repo: "hexpm", optional: false]}, {:hackney, ">= 0.12.0", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm"},
   "exexec": {:hex, :exexec, "0.1.0", "4061bffc3845cb1fcc68eb68943335c75d64cfb4b4553c78f41be457df4a8d34", [:mix], [{:erlexec, "~> 1.7", [hex: :erlexec, optional: false]}]},
-  "exjsx": {:hex, :exjsx, "3.2.0", "7136cc739ace295fc74c378f33699e5145bead4fdc1b4799822d0287489136fb", [:mix], [{:jsx, "~> 2.6.2", [hex: :jsx, optional: false]}]},
+  "exjsx": {:hex, :exjsx, "4.0.0", "60548841e0212df401e38e63c0078ec57b33e7ea49b032c796ccad8cde794b5c", [:mix], [{:jsx, "~> 2.8.0", [hex: :jsx, repo: "hexpm", optional: false]}], "hexpm"},
   "exvcr": {:hex, :exvcr, "0.8.1", "4f46bb82e1c4eaa3d7dabec058a80fdaa7dbbcce4fa56e4a6a5885f662e5b5b1", [:mix], [{:exactor, "~> 2.2", [hex: :exactor, optional: false]}, {:exjsx, "~> 3.2", [hex: :exjsx, optional: false]}, {:httpoison, "~> 0.8", [hex: :httpoison, optional: true]}, {:httpotion, "~> 3.0", [hex: :httpotion, optional: true]}, {:ibrowse, "~> 4.2.2", [hex: :ibrowse, optional: true]}, {:meck, "~> 0.8.3", [hex: :meck, optional: false]}]},
-  "hackney": {:hex, :hackney, "1.6.1", "ddd22d42db2b50e6a155439c8811b8f6df61a4395de10509714ad2751c6da817", [:rebar3], [{:certifi, "0.4.0", [hex: :certifi, optional: false]}, {:idna, "1.2.0", [hex: :idna, optional: false]}, {:metrics, "1.0.1", [hex: :metrics, optional: false]}, {:mimerl, "1.0.2", [hex: :mimerl, optional: false]}, {:ssl_verify_fun, "1.1.0", [hex: :ssl_verify_fun, optional: false]}]},
+  "hackney": {:hex, :hackney, "1.12.1", "8bf2d0e11e722e533903fe126e14d6e7e94d9b7983ced595b75f532e04b7fdc7", [:rebar3], [{:certifi, "2.3.1", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "5.1.1", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "1.0.1", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "1.0.2", [hex: :mimerl, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "1.1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm"},
   "httpoison": {:hex, :httpoison, "0.9.0", "68187a2daddfabbe7ca8f7d75ef227f89f0e1507f7eecb67e4536b3c516faddb", [:mix], [{:hackney, "~> 1.6.0", [hex: :hackney, optional: false]}]},
-  "idna": {:hex, :idna, "1.2.0", "ac62ee99da068f43c50dc69acf700e03a62a348360126260e87f2b54eced86b2", [:rebar3], []},
+  "idna": {:hex, :idna, "5.1.1", "cbc3b2fa1645113267cc59c760bafa64b2ea0334635ef06dbac8801e42f7279c", [:rebar3], [{:unicode_util_compat, "0.3.1", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm"},
   "inch_ex": {:hex, :inch_ex, "0.5.3", "39f11e96181ab7edc9c508a836b33b5d9a8ec0859f56886852db3d5708889ae7", [:mix], [{:poison, "~> 1.5 or ~> 2.0", [hex: :poison, optional: false]}]},
   "jsex": {:hex, :jsex, "2.0.0"},
   "json": {:hex, :json, "0.3.2"},
-  "jsx": {:hex, :jsx, "2.6.2", "213721e058da0587a4bce3cc8a00ff6684ced229c8f9223245c6ff2c88fbaa5a", [:mix, :rebar], []},
+  "jsx": {:hex, :jsx, "2.8.3", "a05252d381885240744d955fbe3cf810504eb2567164824e19303ea59eef62cf", [:mix, :rebar3], [], "hexpm"},
   "meck": {:hex, :meck, "0.8.4", "59ca1cd971372aa223138efcf9b29475bde299e1953046a0c727184790ab1520", [:rebar, :make], []},
   "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], []},
-  "mime": {:hex, :mime, "1.0.1", "05c393850524767d13a53627df71beeebb016205eb43bfbd92d14d24ec7a1b51", [:mix], []},
+  "mime": {:hex, :mime, "1.2.0", "78adaa84832b3680de06f88f0997e3ead3b451a440d183d688085be2d709b534", [:mix], [], "hexpm"},
   "mimerl": {:hex, :mimerl, "1.0.2", "993f9b0e084083405ed8252b99460c4f0563e41729ab42d9074fd5e52439be88", [:rebar3], []},
   "mock": {:hex, :mock, "0.1.3", "657937b03f88fce89b3f7d6becc9f1ec1ac19c71081aeb32117db9bc4d9b3980", [:mix], [{:meck, "~> 0.8.2", [hex: :meck, optional: false]}]},
-  "plug": {:hex, :plug, "1.2.2", "cfbda521b54c92ab8ddffb173fbaabed8d8fc94bec07cd9bb58a84c1c501b0bd", [:mix], [{:cowboy, "~> 1.0", [hex: :cowboy, optional: true]}, {:mime, "~> 1.0", [hex: :mime, optional: false]}]},
+  "parse_trans": {:hex, :parse_trans, "3.2.0", "2adfa4daf80c14dc36f522cf190eb5c4ee3e28008fc6394397c16f62a26258c2", [:rebar3], [], "hexpm"},
+  "plug": {:hex, :plug, "1.5.0", "224b25b4039bedc1eac149fb52ed456770b9678bbf0349cdd810460e1e09195b", [:mix], [{:cowboy, "~> 1.0.1 or ~> 1.1 or ~> 2.1", [hex: :cowboy, repo: "hexpm", optional: true]}, {:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}], "hexpm"},
   "poison": {:hex, :poison, "2.2.0", "4763b69a8a77bd77d26f477d196428b741261a761257ff1cf92753a0d4d24a63", [:mix], []},
-  "ranch": {:hex, :ranch, "1.2.1", "a6fb992c10f2187b46ffd17ce398ddf8a54f691b81768f9ef5f461ea7e28c762", [:make], []},
-  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.0", "edee20847c42e379bf91261db474ffbe373f8acb56e9079acb6038d4e0bf414f", [:rebar, :make], []},
+  "ranch": {:hex, :ranch, "1.3.2", "e4965a144dc9fbe70e5c077c65e73c57165416a901bd02ea899cfd95aa890986", [:rebar3], [], "hexpm"},
+  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.1", "28a4d65b7f59893bc2c7de786dec1e1555bd742d336043fe644ae956c3497fbe", [:make, :rebar], [], "hexpm"},
   "ssl_verify_hostname": {:hex, :ssl_verify_hostname, "1.0.5"},
-  "uri_query": {:hex, :uri_query, "0.1.2", "ae35b83b472f3568c2c159eee3f3ccf585375d8a94fb5382db1ea3589e75c3b4", [:mix], []}}
+  "unicode_util_compat": {:hex, :unicode_util_compat, "0.3.1", "a1f612a7b512638634a603c8f401892afbf99b8ce93a45041f8aaca99cadb85e", [:rebar3], [], "hexpm"},
+  "uri_query": {:hex, :uri_query, "0.1.2", "ae35b83b472f3568c2c159eee3f3ccf585375d8a94fb5382db1ea3589e75c3b4", [:mix], []},
+}