diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..1562af8
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,55 @@
+name: CI
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+    env:
+      MIX_ENV: test
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - pair:
+              elixir: "1.10"
+              otp: 21
+          - pair:
+              elixir: "1.14"
+              otp: 25.1
+            lint: lint
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: ${{matrix.pair.otp}}
+          elixir-version: ${{matrix.pair.elixir}}
+
+      - uses: actions/cache@v2
+        with:
+          path: |
+            deps
+            _build
+          key: ${{ runner.os }}-mix-${{matrix.pair.elixir}}-${{matrix.pair.otp}}-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-mix-
+      - run: mix deps.get
+      - run: mix format --check-formatted
+        if: ${{ matrix.lint }}
+
+      - run: mix deps.unlock --check-unused
+        if: ${{ matrix.lint }}
+
+      - run: mix deps.compile
+
+      - run: mix compile --warnings-as-errors
+        if: ${{ matrix.lint }}
+
+      - run: mix test
+        if: ${{ ! matrix.lint }}
+
+      - run: mix test --warnings-as-errors
+        if: ${{ matrix.lint }}
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..4ab3b2e
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1,2 @@
+elixir 1.14.0-otp-25
+erlang 25.1
diff --git a/lib/proto_validator/protoc/generator.ex b/lib/proto_validator/protoc/generator.ex
index 6a00ea2..8cd676f 100644
--- a/lib/proto_validator/protoc/generator.ex
+++ b/lib/proto_validator/protoc/generator.ex
@@ -106,7 +106,8 @@ defmodule ProtoValidator.Protoc.Generator do
     get_type_name(type, type_name, type_mappings)
   end
 
-  defp get_type_name(type, nil, _type_mappings), do: ":#{ProtoValidator.Protoc.Utils.from_enum(type)}"
+  defp get_type_name(type, nil, _type_mappings),
+    do: ":#{ProtoValidator.Protoc.Utils.from_enum(type)}"
 
   defp get_type_name(_type, type_name, type_mappings) do
     <<?., fqn::binary>> = type_name
diff --git a/lib/validate.pb.ex b/lib/validate.pb.ex
index 3aeedbc..ca473d3 100644
--- a/lib/validate.pb.ex
+++ b/lib/validate.pb.ex
@@ -61,4 +61,4 @@ defmodule Validate.PbExtension do
   use Protobuf, protoc_gen_elixir_version: "0.11.0", syntax: :proto2
 
   extend Google.Protobuf.FieldOptions, :rules, 1071, optional: true, type: Validate.FieldRules
-end
\ No newline at end of file
+end
diff --git a/lib/validator.ex b/lib/validator.ex
index 2971958..4a7587a 100644
--- a/lib/validator.ex
+++ b/lib/validator.ex
@@ -1,5 +1,5 @@
 defmodule ProtoValidator.Validator do
-  @validator Application.get_env(:proto_validator, :validator, :vex)
+  @validator Application.compile_env(:proto_validator, :validator, :vex)
 
   import ProtoValidator.Utils, only: [pipe_validates: 2]
 
diff --git a/mix.lock b/mix.lock
index 6af8e1d..7e45b83 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,6 +1,4 @@
 %{
-  "google_protobuf": {:git, "https://github.com/protocolbuffers/protobuf.git", "fcd26beabe034142c0f1a693f7cb6e1517b03de3", [branch: "main", submodules: true]},
-  "google_protos": {:hex, :google_protos, "0.2.0", "7c6280e288d7f04a58448444b12d937ddc8cc40dc3d1e4f61c69936ef71d4739", [:mix], [{:protobuf, "~> 0.8", [hex: :protobuf, repo: "hexpm", optional: false]}], "hexpm", "5de24802e89867cea544d0ee8cbd36f6c9c1ebd4a9fcc55276d6eeadeedcc1f5"},
   "protobuf": {:hex, :protobuf, "0.11.0", "58d5531abadea3f71135e97bd214da53b21adcdb5b1420aee63f4be8173ec927", [:mix], [{:jason, "~> 1.2", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "30ad9a867a5c5a0616cac9765c4d2c2b7b0030fa81ea6d0c14c2eb5affb6ac52"},
   "vex": {:hex, :vex, "0.9.0", "613ea5eb3055662e7178b83e25b2df0975f68c3d8bb67c1645f0573e1a78d606", [:mix], [], "hexpm", "c69fff44d5c8aa3f1faee71bba1dcab05dd36364c5a629df8bb11751240c857f"},
 }
diff --git a/test/proto_gen/example.pb.ex b/test/proto_gen/example.pb.ex
index d0b20be..a2c0353 100644
--- a/test/proto_gen/example.pb.ex
+++ b/test/proto_gen/example.pb.ex
@@ -35,4 +35,4 @@ defmodule Examplepb.Foo do
   use Protobuf, protoc_gen_elixir_version: "0.11.0", syntax: :proto3
 
   field :int32, 1, type: :int32, deprecated: false
-end
\ No newline at end of file
+end
diff --git a/test/proto_gen/example.pb.validate.ex b/test/proto_gen/example.pb.validate.ex
index 08304ac..d5a0ea1 100644
--- a/test/proto_gen/example.pb.validate.ex
+++ b/test/proto_gen/example.pb.validate.ex
@@ -25,4 +25,4 @@ defmodule ProtoValidator.Gen.Examplepb.Foo do
   use ProtoValidator, entity: Examplepb.Foo
 
   validate(:int32, type: :int32, int32: [gte: 0, lte: 10])
-end
\ No newline at end of file
+end