diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 31d1f54..a4bfe50 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -44,3 +44,7 @@ jobs:
           # skip-build-cache: true
       - name: testing
         run: go test -shuffle on ./...
+      - name: install govulncheck
+        run: go install golang.org/x/vuln/cmd/govulncheck@latest
+      - name: running govulncheck
+        run: govulncheck ./...
diff --git a/.github/workflows/vulns.yml b/.github/workflows/vulns.yml
index ac2e8c0..b8467bd 100644
--- a/.github/workflows/vulns.yml
+++ b/.github/workflows/vulns.yml
@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v3
         with:
-          go-version: ^1.19
+          go-version-file: 'go.mod'
       - name: WriteGoList
         run: go list -json -m all > go.list
       - name: Nancy
diff --git a/Taskfile.yml b/Taskfile.yml
index 0c5218b..3928b71 100644
--- a/Taskfile.yml
+++ b/Taskfile.yml
@@ -18,7 +18,7 @@ tasks:
     cmds:
       - go mod verify
       - go test -shuffle on ./...
-      - docker run --rm -v $(pwd):/app -w /app golangci/golangci-lint:v1.50.1 golangci-lint run --enable gosec --timeout 3m0s ./...
+      - docker run --rm -v $(pwd):/app -w /app golangci/golangci-lint:v1.51.1 golangci-lint run --enable gosec --timeout 3m0s ./...
     sources:
       - ./go.mod
       - '**/*.go'
@@ -37,7 +37,7 @@ tasks:
       - rm -f ./go.sum
       - go clean -cache
       - go clean -modcache
-      - go mod tidy -v -go=1.19
+      - go mod tidy -v -go=1.20
 
   graph:
     desc: Make grapth of dependency modules.
diff --git a/dependency.png b/dependency.png
index 1f8291d..b0f7759 100644
Binary files a/dependency.png and b/dependency.png differ
diff --git a/go.mod b/go.mod
index fc18bf5..90ec5a8 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 module github.com/goark/kkconv
 
-go 1.19
+go 1.20
 
-require golang.org/x/text v0.6.0
+require golang.org/x/text v0.7.0
diff --git a/go.sum b/go.sum
index 7bdf8d7..44d8b0d 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-golang.org/x/text v0.6.0 h1:3XmdazWV+ubf7QgHSTWeykHOci5oeekaGJBLkrkaw4k=
-golang.org/x/text v0.6.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.7.0 h1:4BRB4x83lYWy72KwLD/qYDuTu7q9PjSagHvijDw7cLo=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=