diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
new file mode 100644
index 0000000..0d71d6c
--- /dev/null
+++ b/.github/workflows/golangci-lint.yml
@@ -0,0 +1,25 @@
+name: golangci-lint
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - master
+  pull_request:
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
+          version: v1.29
+
+          # golangci-lint seems to be randomly slow. Increasing the timeout circumvents this issue.
+          args: --timeout 5m
+
+          # See here for more info on this action:
+          # https://github.com/golangci/golangci-lint-action
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..6e40107
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,18 @@
+on: [push, pull_request]
+
+name: Test
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.14.x, 1.15.x]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Test
+        run: go test -v -cover ./...
diff --git a/Makefile b/Makefile
index 6655846..8e2e516 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ COVER_TARGET ?= 85
 
 LINT_OPTS ?= --fix
 LINTERS=-E gofmt -E govet -E errcheck -E staticcheck -E gosimple -E structcheck \
-        -E varcheck -E ineffassign -E typecheck
+        -E varcheck -E ineffassign -E typecheck -E unused
 
 .PHONEY: build
 build: ${SRCS} 
diff --git a/Version b/Version
index 2b7c5ae..17b2ccd 100644
--- a/Version
+++ b/Version
@@ -1 +1 @@
-0.4.2
+0.4.3
diff --git a/env_test.go b/env_test.go
index 4e6e3dd..60f0252 100644
--- a/env_test.go
+++ b/env_test.go
@@ -610,10 +610,10 @@ func TestCustomParserUint64Alias(t *testing.T) {
 	assert.Equal(t, T(1), cfg.Val)
 }
 
-func TypeCustomParserBasicInvalid(t *testing.T) {
-	type ConstT int32
+func TypeCustomParserBasicInvalid(t *testing.T) { //nolint: unused
+	type ConstT int32 //nolint: unused
 
-	type config struct {
+	type config struct { //nolint: unused
 		Const ConstT `env:"CONST_VAL"`
 	}
 
diff --git a/go.mod b/go.mod
index 704ef2d..d0da169 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,10 @@
 module github.com/lindenlab/env
 
-require github.com/stretchr/testify v1.4.0
+go 1.14
+
+require (
+	github.com/stretchr/objx v0.3.0 // indirect
+	github.com/stretchr/testify v1.6.1
+	gopkg.in/yaml.v2 v2.2.2 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect
+)
diff --git a/go.sum b/go.sum
index 68164f9..f6e96f9 100644
--- a/go.sum
+++ b/go.sum
@@ -1,12 +1,23 @@
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.3.0 h1:NGXK3lHquSN08v5vWalVI/L8XU9hdzE/G6xsrze47As=
+github.com/stretchr/objx v0.3.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclpTYkz2zFM+lzLJFO4gQ=
+gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=