diff --git a/mix.exs b/mix.exs
index 0a6eee4..7ad7680 100644
--- a/mix.exs
+++ b/mix.exs
@@ -46,7 +46,7 @@ defmodule WebDriverClient.MixProject do
       {:stream_data, "~> 0.1", only: [:dev, :test]},
       {:excoveralls, "~> 0.10", only: :test},
       {:credo, "~> 1.4.0", only: [:dev, :test], runtime: false},
-      {:dialyxir, "~> 1.1.0", only: [:dev], runtime: false},
+      {:dialyxir, "~> 1.2.0", only: [:dev], runtime: false},
       {:ex_doc, "~> 0.20", only: [:docs, :docs_prerelease]}
     ]
   end
diff --git a/mix.lock b/mix.lock
index ead0c3f..7442267 100644
--- a/mix.lock
+++ b/mix.lock
@@ -5,7 +5,7 @@
   "cowboy": {:hex, :cowboy, "2.6.3", "99aa50e94e685557cad82e704457336a453d4abcb77839ad22dbe71f311fcc06", [:rebar3], [{:cowlib, "~> 2.7.3", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "~> 1.7.1", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm", "e5580029080f3f1ad17436fb97b0d5ed2ed4e4815a96bac36b5a992e20f58db6"},
   "cowlib": {:hex, :cowlib, "2.7.3", "a7ffcd0917e6d50b4d5fb28e9e2085a0ceb3c97dea310505f7460ff5ed764ce9", [:rebar3], [], "hexpm", "1e1a3d176d52daebbecbbcdfd27c27726076567905c2a9d7398c54da9d225761"},
   "credo": {:hex, :credo, "1.4.0", "92339d4cbadd1e88b5ee43d427b639b68a11071b6f73854e33638e30a0ea11f5", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "1fd3b70dce216574ce3c18bdf510b57e7c4c85c2ec9cad4bff854abaf7e58658"},
-  "dialyxir": {:hex, :dialyxir, "1.1.0", "c5aab0d6e71e5522e77beff7ba9e08f8e02bad90dfbeffae60eaf0cb47e29488", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "07ea8e49c45f15264ebe6d5b93799d4dd56a44036cf42d0ad9c960bc266c0b9a"},
+  "dialyxir": {:hex, :dialyxir, "1.2.0", "58344b3e87c2e7095304c81a9ae65cb68b613e28340690dfe1a5597fd08dec37", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "61072136427a851674cab81762be4dbeae7679f85b1272b6d25c3a839aff8463"},
   "earmark": {:hex, :earmark, "1.4.3", "364ca2e9710f6bff494117dbbd53880d84bebb692dafc3a78eb50aa3183f2bfd", [:mix], [], "hexpm", "8cf8a291ebf1c7b9539e3cddb19e9cef066c2441b1640f13c34c1d3cfc825fec"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.16", "607709303e1d4e3e02f1444df0c821529af1c03b8578dfc81bb9cf64553d02b9", [:mix], [], "hexpm", "69fcf696168f5a274dd012e3e305027010658b2d1630cef68421d6baaeaccead"},
   "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},