diff --git a/.github/workflows/reviewdog.yml b/.github/workflows/reviewdog.yml
index 4abcbf3..3406603 100644
--- a/.github/workflows/reviewdog.yml
+++ b/.github/workflows/reviewdog.yml
@@ -5,46 +5,14 @@ jobs:
     name: runner / golangci-lint
     runs-on: ubuntu-latest
     steps:
-      - name: set up
-        uses: actions/setup-go@v1
-        with:
-          go-version: 1.12
-        id: go
-
-      - name: Add $GOPATH/bin
-        run: |
-          echo ::add-path::$(go env GOPATH)/bin
-
       - name: Check out code into the Go module directory
         uses: actions/checkout@v1
-
-      # cache store
-      - name: cache
-        uses: actions/cache@v1
+      - name: golangci-lint
+        uses: reviewdog/action-golangci-lint@v1
         with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
-
-      - name: download modules
-        # キャッシュが保存されていればそれを使う
-        if: steps.cache.outputs.cache-hit != 'true'
-        run: go mod download
-
-      - name: Setup reviewdog
-        run: |
-          curl -sfL https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh| sh -s -- -b $(go env GOPATH)/bin
-
-      - name: install lint
-        run: curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.18.0
-
-      - name: Run reviewdog
-        env:
-          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          golangci-lint run --out-format line-number --enable-all --exclude-use-default=false -c=./.golangci.yml \
-            | reviewdog -f=golangci-lint -name="golangci-lint" -reporter="github-check"
+          github_token: ${{ secrets.github_token }}
+          golangci_lint_flags: "--enable-all --exclude-use-default=false ./..."
+          reporter: github-check
 
   misspell:
     name: runner / misspell
diff --git a/cmd/envdef/envdef.go b/cmd/envdef/envdef.go
index 205935d..a5a95cd 100644
--- a/cmd/envdef/envdef.go
+++ b/cmd/envdef/envdef.go
@@ -11,11 +11,12 @@ func main() {
 	defaultSource := ".env.sample"
 	defaultDist := ".env"
 
-	var source string
+	source := ""
+	dist := ""
+	overwrite := false
+
 	flag.StringVar(&source, "s", defaultSource, "source .env file")
-	var dist string
 	flag.StringVar(&dist, "d", defaultDist, "distribution .env file")
-	var overwrite bool
 	flag.BoolVar(&overwrite, "o", false, "Whether to overwrite when the key already exists.")
 
 	flag.Parse()
@@ -29,5 +30,6 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
+
 	result.Print()
 }
diff --git a/go.mod b/go.mod
index 8b3d988..e0c4b00 100644
--- a/go.mod
+++ b/go.mod
@@ -3,9 +3,13 @@ module github.com/locona/envdef
 go 1.12
 
 require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fatih/color v1.9.0
 	github.com/joho/godotenv v1.3.0
+	github.com/kr/pretty v0.1.0 // indirect
 	github.com/mattn/go-colorable v0.1.6 // indirect
 	github.com/stretchr/testify v1.5.1
 	golang.org/x/sys v0.0.0-20200316230553-a7d97aace0b0 // indirect
+	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
+	gopkg.in/yaml.v2 v2.2.8 // indirect
 )
diff --git a/go.sum b/go.sum
index 968799c..a01d117 100644
--- a/go.sum
+++ b/go.sum
@@ -1,9 +1,16 @@
 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/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
 github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
 github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc=
 github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
 github.com/mattn/go-colorable v0.1.6 h1:6Su7aK7lXmJ/U79bYtBjLNaha4Fs1Rg9plHpcH+vvnE=
 github.com/mattn/go-colorable v0.1.6/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
@@ -26,5 +33,9 @@ golang.org/x/sys v0.0.0-20200316230553-a7d97aace0b0 h1:4Khi5GeNOkZS5DqSBRn4Sy7BE
 golang.org/x/sys v0.0.0-20200316230553-a7d97aace0b0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 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/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/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.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=