diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0316a3b..de944f1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,32 +12,23 @@ jobs:
     name: Main Process
     runs-on: ubuntu-latest
     env:
-      GO_VERSION: 1.19
-      GOLANGCI_LINT_VERSION: v1.50.0
+      GO_VERSION: '1.20'
+      GOLANGCI_LINT_VERSION: v1.53.3
       CGO_ENABLED: 0
 
     steps:
 
-      # https://github.com/marketplace/actions/setup-go-environment
-      - name: Set up Go ${{ env.GO_VERSION }}
-        uses: actions/setup-go@v2
-        with:
-          go-version: ${{ env.GO_VERSION }}
-
       # https://github.com/marketplace/actions/checkout
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
-      # https://github.com/marketplace/actions/cache
-      - name: Cache Go modules
-        uses: actions/cache@v3
+      # https://github.com/marketplace/actions/setup-go-environment
+      - name: Set up Go ${{ env.GO_VERSION }}
+        uses: actions/setup-go@v4
         with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
+          go-version: ${{ env.GO_VERSION }}
 
       - name: Check and get dependencies
         run: |
diff --git a/.github/workflows/go-cross.yml b/.github/workflows/go-cross.yml
index 4bb47a1..6682433 100644
--- a/.github/workflows/go-cross.yml
+++ b/.github/workflows/go-cross.yml
@@ -19,33 +19,15 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
-      # https://github.com/marketplace/actions/setup-go-environment
-      - name: Set up Go ${{ matrix.go-version }}
-        uses: actions/setup-go@v2
-        with:
-          go-version: ${{ matrix.go-version }}
-
       # https://github.com/marketplace/actions/checkout
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
-      # https://github.com/marketplace/actions/cache
-      - name: Cache Go modules
-        uses: actions/cache@v3
+      # https://github.com/marketplace/actions/setup-go-environment
+      - name: Set up Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v4
         with:
-          # In order:
-          # * Module download cache
-          # * Build cache (Linux)
-          # * Build cache (Mac)
-          # * Build cache (Windows)
-          path: |
-            ~/go/pkg/mod
-            ~/.cache/go-build
-            ~/Library/Caches/go-build
-            %LocalAppData%\go-build
-          key: ${{ runner.os }}-${{ matrix.go-version }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-${{ matrix.go-version }}-go-
+          go-version: ${{ matrix.go-version }}
 
       - name: Test
         run: go test -v -cover ./...
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 452ba27..a6ac87a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -9,23 +9,23 @@ jobs:
     name: Release Process
     runs-on: ubuntu-latest
     env:
-      GO_VERSION: 1.19
+      GO_VERSION: '1.20'
       CGO_ENABLED: 0
 
     steps:
 
-      # https://github.com/marketplace/actions/setup-go-environment
-      - name: Set up Go ${{ env.GO_VERSION }}
-        uses: actions/setup-go@v2
-        with:
-          go-version: ${{ env.GO_VERSION }}
-
       # https://github.com/marketplace/actions/checkout
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
+      # https://github.com/marketplace/actions/setup-go-environment
+      - name: Set up Go ${{ env.GO_VERSION }}
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
       - name: dockerhub-login
         uses: docker/login-action@v1
         with:
diff --git a/.golangci.yml b/.golangci.yml
index 5b01fb3..882b054 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -20,10 +20,13 @@ linters-settings:
   gofumpt:
     extra-rules: true
   depguard:
-    list-type: blacklist
-    include-go-root: false
-    packages:
-      - github.com/pkg/errors
+    rules:
+      main:
+        deny:
+          - pkg: "github.com/instana/testify"
+            desc: not allowed
+          - pkg: "github.com/pkg/errors"
+            desc: Should be replaced by standard lib errors package
   godox:
     keywords:
       - FIXME
diff --git a/app.go b/app.go
index 90af238..c39008c 100644
--- a/app.go
+++ b/app.go
@@ -54,6 +54,7 @@ func init() {
 	flag.StringVar(&name, "name", os.Getenv("WHOAMI_NAME"), "give me a name")
 }
 
+// Data whoami information.
 type Data struct {
 	Hostname   string      `json:"hostname,omitempty"`
 	IP         []string    `json:"ip,omitempty"`
diff --git a/go.mod b/go.mod
index bd95bb5..2e7699e 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 module github.com/traefik/whoami
 
-go 1.19
+go 1.20
 
 require github.com/gorilla/websocket v1.4.2