diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
index a8a9c04..7c9cbd2 100644
--- a/.github/workflows/docker-image.yml
+++ b/.github/workflows/docker-image.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3.5.3
+      - uses: actions/checkout@v4.1.1
       - name: Build the Docker image
         run: docker build . --file Dockerfile --tag yosoy-local:latest
       - name: Run simple integration test
diff --git a/.github/workflows/docker-publish.yml b/.github/workflows/docker-publish.yml
index d9043e8..4e25dc2 100644
--- a/.github/workflows/docker-publish.yml
+++ b/.github/workflows/docker-publish.yml
@@ -15,16 +15,16 @@ jobs:
       contents: read
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v3.5.3
+        uses: actions/checkout@v4.1.1
 
       - name: Log in to Docker Hub
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_HUB_USERNAME }}
           password: ${{ secrets.DOCKER_HUB_TOKEN }}
 
       - name: Log in to the Container registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -32,7 +32,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
         with:
           images: |
             lukasz/yosoy
@@ -44,7 +44,7 @@ jobs:
             type=semver,pattern={{major}}
 
       - name: Build and push Docker images
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: true
diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index f283a35..aa0e9b0 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -6,7 +6,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3.5.3
+      - uses: actions/checkout@v4.1.1
 
       - name: Set up Go
         uses: actions/setup-go@v4
diff --git a/server.go b/server.go
index 8f03098..7a271b3 100644
--- a/server.go
+++ b/server.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"encoding/json"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
@@ -71,7 +70,7 @@ func handler(w http.ResponseWriter, req *http.Request) {
 		response.Files = make(map[string]string)
 		files := strings.Split(showFiles, ",")
 		for _, file := range files {
-			bytes, err := ioutil.ReadFile(file)
+			bytes, err := os.ReadFile(file)
 			if err != nil {
 				log.Printf("Could not read file %v: %v\n", file, err)
 				continue
diff --git a/server_test.go b/server_test.go
index 7a0e7b0..b2493e2 100644
--- a/server_test.go
+++ b/server_test.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -29,8 +30,12 @@ func TestHandler(t *testing.T) {
 		t.Errorf("handler returned wrong status code: got %v want %v", status, http.StatusOK)
 	}
 
+	result := rr.Result()
+	buf := new(bytes.Buffer)
+	buf.ReadFrom(result.Body)
+
 	var response response
-	json.Unmarshal(rr.Body.Bytes(), &response)
+	json.Unmarshal(buf.Bytes(), &response)
 
 	// test response
 	assert.Equal(t, 1, response.Counter)
@@ -43,5 +48,5 @@ func TestHandler(t *testing.T) {
 	assert.NotEmpty(t, response.Files[".gitignore"])
 
 	// test cors
-	assert.Contains(t, rr.HeaderMap["Access-Control-Allow-Origin"], "*")
+	assert.Contains(t, result.Header["Access-Control-Allow-Origin"], "*")
 }