diff --git a/bench/mix.exs b/bench/mix.exs
index 7f53b0e..649fe7c 100644
--- a/bench/mix.exs
+++ b/bench/mix.exs
@@ -25,11 +25,11 @@ defmodule JasonBench.MixProject do
       {:jason, "~> 1.0", path: "../", override: true},
       {:benchee, "~> 1.0"},
       {:benchee_html, "~> 1.0"},
-      {:poison, "~> 3.0"},
+      {:poison, "~> 5.0"},
       {:exjsx, "~> 4.0"},
       {:tiny, "~> 1.0"},
       {:jsone, "~> 1.4"},
-      {:jiffy, "~> 0.14"},
+      {:jiffy, "~> 1.0"},
       {:json, "~> 1.0"},
     ]
   end
diff --git a/bench/mix.lock b/bench/mix.lock
index 7e4827e..aaaf452 100644
--- a/bench/mix.lock
+++ b/bench/mix.lock
@@ -1,14 +1,14 @@
 %{
-  "benchee": {:hex, :benchee, "1.0.0", "2524b6c0e541309d969accf75f77e1d1653e46142afc68e9ea4ff35559a794bc", [:mix], [{:deep_merge, "~> 1.0", [hex: :deep_merge, repo: "hexpm", optional: false]}], "hexpm"},
-  "benchee_html": {:hex, :benchee_html, "1.0.0", "5b4d24effebd060f466fb460ec06576e7b34a00fc26b234fe4f12c4f05c95947", [:mix], [{:benchee, ">= 0.99.0 and < 2.0.0", [hex: :benchee, repo: "hexpm", optional: false]}, {:benchee_json, "~> 1.0", [hex: :benchee_json, repo: "hexpm", optional: false]}], "hexpm"},
-  "benchee_json": {:hex, :benchee_json, "1.0.0", "cc661f4454d5995c08fe10dd1f2f72f229c8f0fb1c96f6b327a8c8fc96a91fe5", [:mix], [{:benchee, ">= 0.99.0 and < 2.0.0", [hex: :benchee, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm"},
-  "deep_merge": {:hex, :deep_merge, "1.0.0", "b4aa1a0d1acac393bdf38b2291af38cb1d4a52806cf7a4906f718e1feb5ee961", [:mix], [], "hexpm"},
-  "exjsx": {:hex, :exjsx, "4.0.0", "60548841e0212df401e38e63c0078ec57b33e7ea49b032c796ccad8cde794b5c", [:mix], [{:jsx, "~> 2.8.0", [hex: :jsx, repo: "hexpm", optional: false]}], "hexpm"},
+  "benchee": {:hex, :benchee, "1.0.1", "66b211f9bfd84bd97e6d1beaddf8fc2312aaabe192f776e8931cb0c16f53a521", [:mix], [{:deep_merge, "~> 1.0", [hex: :deep_merge, repo: "hexpm", optional: false]}], "hexpm", "3ad58ae787e9c7c94dd7ceda3b587ec2c64604563e049b2a0e8baafae832addb"},
+  "benchee_html": {:hex, :benchee_html, "1.0.0", "5b4d24effebd060f466fb460ec06576e7b34a00fc26b234fe4f12c4f05c95947", [:mix], [{:benchee, ">= 0.99.0 and < 2.0.0", [hex: :benchee, repo: "hexpm", optional: false]}, {:benchee_json, "~> 1.0", [hex: :benchee_json, repo: "hexpm", optional: false]}], "hexpm", "5280af9aac432ff5ca4216d03e8a93f32209510e925b60e7f27c33796f69e699"},
+  "benchee_json": {:hex, :benchee_json, "1.0.0", "cc661f4454d5995c08fe10dd1f2f72f229c8f0fb1c96f6b327a8c8fc96a91fe5", [:mix], [{:benchee, ">= 0.99.0 and < 2.0.0", [hex: :benchee, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "da05d813f9123505f870344d68fb7c86a4f0f9074df7d7b7e2bb011a63ec231c"},
+  "deep_merge": {:hex, :deep_merge, "1.0.0", "b4aa1a0d1acac393bdf38b2291af38cb1d4a52806cf7a4906f718e1feb5ee961", [:mix], [], "hexpm", "ce708e5f094b9cd4e8f2be4f00d2f4250c4095be93f8cd6d018c753894885430"},
+  "exjsx": {:hex, :exjsx, "4.0.0", "60548841e0212df401e38e63c0078ec57b33e7ea49b032c796ccad8cde794b5c", [:mix], [{:jsx, "~> 2.8.0", [hex: :jsx, repo: "hexpm", optional: false]}], "hexpm", "32e95820a97cffea67830e91514a2ad53b888850442d6d395f53a1ac60c82e07"},
   "jason": {:hex, :jason, "1.1.2", "b03dedea67a99223a2eaf9f1264ce37154564de899fd3d8b9a21b1a6fd64afe7", [], [{:decimal, "~> 1.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm"},
-  "jiffy": {:hex, :jiffy, "0.15.2", "de266c390111fd4ea28b9302f0bc3d7472468f3b8e0aceabfbefa26d08cd73b7", [:rebar3], [], "hexpm"},
-  "json": {:hex, :json, "1.2.1", "21e8d6983091660f394f44a7c11f8cf1f467afb2aada1fcf59c2f1b590a42f68", [:mix], [], "hexpm"},
-  "jsone": {:hex, :jsone, "1.4.7", "a970c23d9700ae7842b526c57677e6e3f10894b429524696ead547e9302391c0", [:rebar3], [], "hexpm"},
-  "jsx": {:hex, :jsx, "2.8.3", "a05252d381885240744d955fbe3cf810504eb2567164824e19303ea59eef62cf", [:mix, :rebar3], [], "hexpm"},
-  "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm"},
-  "tiny": {:hex, :tiny, "1.0.1", "535ea7e600cb1c6ba17b53029266d9d7ec54ce29bfb05d906c433907acfa01ca", [:mix], [], "hexpm"},
+  "jiffy": {:hex, :jiffy, "1.0.8", "60e36f00be35e5ac6e6cf2d4caf3bdf3103d4460aff385f543a8d7df2d6d9613", [:rebar3], [], "hexpm", "f9ae986ba5a0854eb48cf6a76192d9367086da86c20197da430630be7c087a4e"},
+  "json": {:hex, :json, "1.4.1", "8648f04a9439765ad449bc56a3ff7d8b11dd44ff08ffcdefc4329f7c93843dfa", [:mix], [], "hexpm", "9abf218dbe4ea4fcb875e087d5f904ef263d012ee5ed21d46e9dbca63f053d16"},
+  "jsone": {:hex, :jsone, "1.7.0", "1e3bd7d5dd44bb2eb0797dddea1cbf2ddab8d9f29e499a467ca171c23f5984ea", [:rebar3], [], "hexpm", "a3a33712ee6bc8be10cfa21c7c425a299de4c5a8533f9f931e577a6d0e8f5dbd"},
+  "jsx": {:hex, :jsx, "2.8.3", "a05252d381885240744d955fbe3cf810504eb2567164824e19303ea59eef62cf", [:mix, :rebar3], [], "hexpm", "fc3499fed7a726995aa659143a248534adc754ebd16ccd437cd93b649a95091f"},
+  "poison": {:hex, :poison, "5.0.0", "d2b54589ab4157bbb82ec2050757779bfed724463a544b6e20d79855a9e43b24", [:mix], [{:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "11dc6117c501b80c62a7594f941d043982a1bd05a1184280c0d9166eb4d8d3fc"},
+  "tiny": {:hex, :tiny, "1.0.1", "535ea7e600cb1c6ba17b53029266d9d7ec54ce29bfb05d906c433907acfa01ca", [:mix], [], "hexpm", "1278a457deb8d99135c378b71f66f21e283d8adea426252a3f8f5e003c536a7b"},
 }