diff --git a/.editorconfig b/.editorconfig
index b391a74..b9c1dda 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -13,6 +13,3 @@ trim_trailing_whitespace = true
 [*.go]
 indent_style = tab
 
-[{*.markdown,*.md}]
-indent_size = 4
-tab_width = 4
diff --git a/.github/README.md b/.github/README.md
index 5e7df1c..1ee84b9 100644
--- a/.github/README.md
+++ b/.github/README.md
@@ -1,7 +1,5 @@
 # go-test-sarif
 
-[![CI](https://github.com/ivuorinen/go-test-sarif/actions/workflows/test.yml/badge.svg)](https://github.com/ivuorinen/go-test-sarif/actions/workflows/test.yml)
-
 `go-test-sarif` is a CLI tool and GitHub Action for converting `go test -json` output into SARIF format, making it compatible with GitHub Security Tab and other SARIF consumers.
 
 ## 🚀 Features
diff --git a/internal/converter.go b/internal/converter.go
index 9088f83..fb8da46 100644
--- a/internal/converter.go
+++ b/internal/converter.go
@@ -1,9 +1,10 @@
+// Package internal contains internal helper functions for the Go Test SARIF converter.
 package internal
 
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 )
 
 // TestResult represents a single test result from 'go test -json' output.
@@ -16,7 +17,7 @@ type TestResult struct {
 // ConvertToSARIF converts Go test JSON results to SARIF format.
 func ConvertToSARIF(inputFile, outputFile string) error {
 	// Read the input file
-	data, err := ioutil.ReadFile(inputFile)
+	data, err := os.ReadFile(inputFile)
 	if err != nil {
 		return fmt.Errorf("failed to read input file: %w", err)
 	}
@@ -50,7 +51,7 @@ func ConvertToSARIF(inputFile, outputFile string) error {
 	}
 
 	// Write the SARIF JSON to the output file
-	if err := ioutil.WriteFile(outputFile, sarifJSON, 0644); err != nil {
+	if err := os.WriteFile(outputFile, sarifJSON, 0644); err != nil {
 		return fmt.Errorf("failed to write SARIF output file: %w", err)
 	}
 
@@ -60,14 +61,14 @@ func ConvertToSARIF(inputFile, outputFile string) error {
 
 // convertResults transforms test results into SARIF result objects.
 func convertResults(testResults []TestResult) []map[string]interface{} {
-	var results []map[string]interface{}
+	var results []map[string]any
 	for _, tr := range testResults {
 		if tr.Action == "fail" {
-			results = append(results, map[string]interface{}{
-				"ruleId":   "go-test-failure",
-				"message":  map[string]string{"text": tr.Output},
-				"level":    "error",
-				"locations": []map[string]interface{}{},
+			results = append(results, map[string]any{
+				"ruleId":    "go-test-failure",
+				"message":   map[string]string{"text": tr.Output},
+				"level":     "error",
+				"locations": []map[string]any{},
 			})
 		}
 	}
diff --git a/internal/converter_test.go b/internal/converter_test.go
index 4698056..c3153fd 100644
--- a/internal/converter_test.go
+++ b/internal/converter_test.go
@@ -12,7 +12,12 @@ func TestConvertToSARIF_Success(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Failed to create temp input file: %v", err)
 	}
-	defer os.Remove(inputFile.Name())
+	defer func(name string) {
+		err := os.Remove(name)
+		if err != nil {
+			t.Fatalf("Failed to remove temp input file: %v", err)
+		}
+	}(inputFile.Name())
 
 	inputContent := `[{"Action":"fail","Package":"github.com/ivuorinen/go-test-sarif/internal","Output":"Test failed"}]`
 	if _, err := inputFile.WriteString(inputContent); err != nil {
@@ -24,7 +29,12 @@ func TestConvertToSARIF_Success(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Failed to create temp output file: %v", err)
 	}
-	defer os.Remove(outputFile.Name())
+	defer func(name string) {
+		err := os.Remove(name)
+		if err != nil {
+			t.Fatalf("Failed to remove temp output file: %v", err)
+		}
+	}(outputFile.Name())
 
 	// Run the ConvertToSARIF function
 	err = ConvertToSARIF(inputFile.Name(), outputFile.Name())
@@ -53,7 +63,12 @@ func TestConvertToSARIF_InvalidInput(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Failed to create temp input file: %v", err)
 	}
-	defer os.Remove(inputFile.Name())
+	defer func(name string) {
+		err := os.Remove(name)
+		if err != nil {
+			t.Fatalf("Failed to remove temp input file: %v", err)
+		}
+	}(inputFile.Name())
 
 	inputContent := `{"Action":"fail","Package":"github.com/ivuorinen/go-test-sarif/internal","Output":Test failed}` // Missing quotes around 'Test failed'
 	if _, err := inputFile.WriteString(inputContent); err != nil {
@@ -65,7 +80,12 @@ func TestConvertToSARIF_InvalidInput(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Failed to create temp output file: %v", err)
 	}
-	defer os.Remove(outputFile.Name())
+	defer func(name string) {
+		err := os.Remove(name)
+		if err != nil {
+			t.Fatalf("Failed to remove temp output file: %v", err)
+		}
+	}(outputFile.Name())
 
 	// Run the ConvertToSARIF function
 	err = ConvertToSARIF(inputFile.Name(), outputFile.Name())
@@ -84,7 +104,12 @@ func TestConvertToSARIF_FileNotFound(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Failed to create temp output file: %v", err)
 	}
-	defer os.Remove(outputFile.Name())
+	defer func(name string) {
+		err := os.Remove(name)
+		if err != nil {
+			t.Fatalf("Failed to remove temp output file: %v", err)
+		}
+	}(outputFile.Name())
 
 	// Run the ConvertToSARIF function
 	err = ConvertToSARIF(inputFile, outputFile.Name())