diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
new file mode 100644
index 0000000..b568233
--- /dev/null
+++ b/.github/workflows/elixir.yml
@@ -0,0 +1,54 @@
+name: Elixir CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    name: Build and test
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        otp:
+          - 23.3.4
+          - 24.1.1
+        elixir:
+          - 1.11.4
+          - 1.12.3
+        include:
+          - otp: 24.1.1
+            elixir: 1.12.3
+            lint: lint
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          elixir-version: ${{ matrix.elixir }}
+          otp-version: ${{ matrix.otp }}
+
+      - name: Restore dependencies cache
+        uses: actions/cache@v2
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ matrix.elixir}}-${{ matrix.otp }}-${{ hashFiles('**/mix.lock') }}
+
+      - name: Install dependencies
+        run: mix deps.get
+
+      - run: mix format --check-formatted
+        if: ${{ matrix.lint }}
+
+      - run: mix deps.compile
+
+      - run: mix compile --warnings-as-errors
+        if: ${{ matrix.lint }}
+
+      - name: Run tests
+        run: mix test
diff --git a/lib/tds_encoding.ex b/lib/tds_encoding.ex
index ed0d87f..eda72bf 100644
--- a/lib/tds_encoding.ex
+++ b/lib/tds_encoding.ex
@@ -37,7 +37,7 @@ defmodule Tds.Encoding do
   use Rustler,
     otp_app: :tds_encoding,
     crate: "tds_encoding",
-    mode: if Mix.env() == :prod, do: :release, else: :debug
+    mode: if(Mix.env() == :prod, do: :release, else: :debug)
 
   @doc """
   Encodes utf-8 string using given codepage. If there are any unknown codes they
diff --git a/mix.exs b/mix.exs
index 6c88ac6..1264538 100644
--- a/mix.exs
+++ b/mix.exs
@@ -9,8 +9,9 @@ defmodule Tds.Encoding.MixProject do
       elixir: "~> 1.9",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
-      description: "String encoding/decoding NIF using rust [encoding](https://crates.io/crates/encoding) library",
-      package: package(),
+      description:
+        "String encoding/decoding NIF using rust [encoding](https://crates.io/crates/encoding) library",
+      package: package()
     ]
   end
 
@@ -25,7 +26,7 @@ defmodule Tds.Encoding.MixProject do
   defp deps do
     [
       {:rustler, "~> 0.22.0"},
-      {:ex_doc, ">= 0.0.0", only: :dev, runtime: false},
+      {:ex_doc, ">= 0.0.0", only: :dev, runtime: false}
     ]
   end
 
@@ -35,8 +36,7 @@ defmodule Tds.Encoding.MixProject do
       maintainers: ["Milan Jarić"],
       licenses: ["MIT"],
       links: %{"GitHub" => "https://github.com/mjaric/tds-encoding"},
-      files:
-        ~w(.formatter.exs mix.exs README.md lib native)
+      files: ~w(.formatter.exs mix.exs README.md lib native)
     ]
   end
 end
diff --git a/mix.lock b/mix.lock
index 63353d7..7edb73b 100644
--- a/mix.lock
+++ b/mix.lock
@@ -2,10 +2,11 @@
   "earmark": {:hex, :earmark, "1.4.3", "364ca2e9710f6bff494117dbbd53880d84bebb692dafc3a78eb50aa3183f2bfd", [:mix], [], "hexpm", "8cf8a291ebf1c7b9539e3cddb19e9cef066c2441b1640f13c34c1d3cfc825fec"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.15", "b29e8e729f4aa4a00436580dcc2c9c5c51890613457c193cc8525c388ccb2f06", [:mix], [], "hexpm", "044523d6438ea19c1b8ec877ec221b008661d3c27e3b848f4c879f500421ca5c"},
   "ex_doc": {:hex, :ex_doc, "0.25.3", "3edf6a0d70a39d2eafde030b8895501b1c93692effcbd21347296c18e47618ce", [:mix], [{:earmark_parser, "~> 1.4.0", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "9ebebc2169ec732a38e9e779fd0418c9189b3ca93f4a676c961be6c1527913f5"},
+  "jason": {:hex, :jason, "1.2.2", "ba43e3f2709fd1aa1dce90aaabfd039d000469c05c56f0b8e31978e03fa39052", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "18a228f5f0058ee183f29f9eae0805c6e59d61c3b006760668d8d18ff0d12179"},
   "makeup": {:hex, :makeup, "1.0.5", "d5a830bc42c9800ce07dd97fa94669dfb93d3bf5fcf6ea7a0c67b2e0e4a7f26c", [:mix], [{:nimble_parsec, "~> 0.5 or ~> 1.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "cfa158c02d3f5c0c665d0af11512fed3fba0144cf1aadee0f2ce17747fba2ca9"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.15.1", "b5888c880d17d1cc3e598f05cdb5b5a91b7b17ac4eaf5f297cb697663a1094dd", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.1", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "db68c173234b07ab2a07f645a5acdc117b9f99d69ebf521821d89690ae6c6ec8"},
   "makeup_erlang": {:hex, :makeup_erlang, "0.1.1", "3fcb7f09eb9d98dc4d208f49cc955a34218fc41ff6b84df7c75b3e6e533cc65f", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "174d0809e98a4ef0b3309256cbf97101c6ec01c4ab0b23e926a9e17df2077cbb"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.1.0", "3a6fca1550363552e54c216debb6a9e95bd8d32348938e13de5eda962c0d7f89", [:mix], [], "hexpm", "08eb32d66b706e913ff748f11694b17981c0b04a33ef470e33e11b3d3ac8f54b"},
-  "rustler": {:hex, :rustler, "0.22.0", "e2930f9d6933e910f87526bb0a7f904e32b62a7e838a3ca4a884ee7fdfb957ed", [:mix], [{:toml, "~> 0.5.2", [hex: :toml, repo: "hexpm", optional: false]}], "hexpm", "01f5989dd511ebec09be481e07d3c59773d5373c5061e09d3ebc3ef61811b49d"},
+  "rustler": {:hex, :rustler, "0.22.2", "f92d6dba71bef6fe5f0d955649cb071127adc92f32a78890e8fa9939e59a1b41", [:mix], [{:jason, "~> 1.2", [hex: :jason, repo: "hexpm", optional: false]}, {:toml, "~> 0.5.2", [hex: :toml, repo: "hexpm", optional: false]}], "hexpm", "56b129141e86d60a2d670af9a2b55a9071e10933ef593034565af77e84655118"},
   "toml": {:hex, :toml, "0.5.2", "e471388a8726d1ce51a6b32f864b8228a1eb8edc907a0edf2bb50eab9321b526", [:mix], [], "hexpm", "f1e3dabef71fb510d015fad18c0e05e7c57281001141504c6b69d94e99750a07"},
 }
diff --git a/test/tds_encoding_test.exs b/test/tds_encoding_test.exs
index 4a94774..96af996 100644
--- a/test/tds_encoding_test.exs
+++ b/test/tds_encoding_test.exs
@@ -16,6 +16,7 @@ defmodule TdsEncodingTest do
   test "should decode broken string and replace unkinwn with `�` code" do
     assert "\u{c6b0}\u{c640}\u{fffd}\u{c559}" ==
              decode(<<0xBF, 0xEC, 0xBF, 0xCD, 0xFF, 0xBE, 0xD3>>, "windows-949")
+
     # same encoding/decoding as above but ecoding name is different
     assert "\u{c6b0}\u{c640}\u{fffd}\u{c559}" ==
              decode(<<0xBF, 0xEC, 0xBF, 0xCD, 0xFF, 0xBE, 0xD3>>, "euc-kr")