diff --git a/cmd/tlsconfig/tlsconfig.go b/cmd/tlsconfig/tlsconfig.go
index ece83ec..a9098bb 100644
--- a/cmd/tlsconfig/tlsconfig.go
+++ b/cmd/tlsconfig/tlsconfig.go
@@ -187,7 +187,7 @@ func main() {
 	}
 
 	outputPath := filepath.Join(dir, *outputFile)
-	if err := ioutil.WriteFile(outputPath, src, 0644); err != nil {
+	if err := ioutil.WriteFile(outputPath, src, 0o644); err != nil {
 		log.Fatalf("Writing output: %s", err)
 	} // #nosec G306
 }
diff --git a/helpers_test.go b/helpers_test.go
index ee3114c..a4d484b 100644
--- a/helpers_test.go
+++ b/helpers_test.go
@@ -39,7 +39,7 @@ var _ = Describe("Helpers", func() {
 		})
 		It("should exclude folder", func() {
 			nested := dir + "/vendor"
-			err := os.Mkdir(nested, 0755)
+			err := os.Mkdir(nested, 0o755)
 			Expect(err).ShouldNot(HaveOccurred())
 			_, err = os.Create(nested + "/test.go")
 			Expect(err).ShouldNot(HaveOccurred())
@@ -51,7 +51,7 @@ var _ = Describe("Helpers", func() {
 		})
 		It("should exclude folder with subpath", func() {
 			nested := dir + "/pkg/generated"
-			err := os.MkdirAll(nested, 0755)
+			err := os.MkdirAll(nested, 0o755)
 			Expect(err).ShouldNot(HaveOccurred())
 			_, err = os.Create(nested + "/test.go")
 			Expect(err).ShouldNot(HaveOccurred())
diff --git a/rules/fileperms.go b/rules/fileperms.go
index e6a80a5..93265dd 100644
--- a/rules/fileperms.go
+++ b/rules/fileperms.go
@@ -64,7 +64,7 @@ func (r *filePermissions) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, err
 
 // NewWritePerms creates a rule to detect file Writes with bad permissions.
 func NewWritePerms(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
-	mode := getConfiguredMode(conf, "G306", 0600)
+	mode := getConfiguredMode(conf, "G306", 0o600)
 	return &filePermissions{
 		mode:  mode,
 		pkgs:  []string{"io/ioutil", "os"},
@@ -81,7 +81,7 @@ func NewWritePerms(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
 // NewFilePerms creates a rule to detect file creation with a more permissive than configured
 // permission mask.
 func NewFilePerms(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
-	mode := getConfiguredMode(conf, "G302", 0600)
+	mode := getConfiguredMode(conf, "G302", 0o600)
 	return &filePermissions{
 		mode:  mode,
 		pkgs:  []string{"os"},
@@ -98,7 +98,7 @@ func NewFilePerms(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
 // NewMkdirPerms creates a rule to detect directory creation with more permissive than
 // configured permission mask.
 func NewMkdirPerms(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
-	mode := getConfiguredMode(conf, "G301", 0750)
+	mode := getConfiguredMode(conf, "G301", 0o750)
 	return &filePermissions{
 		mode:  mode,
 		pkgs:  []string{"os"},
diff --git a/testutils/pkg.go b/testutils/pkg.go
index eb9cd42..1364e1d 100644
--- a/testutils/pkg.go
+++ b/testutils/pkg.go
@@ -53,7 +53,7 @@ func (p *TestPackage) write() error {
 		return nil
 	}
 	for filename, content := range p.Files {
-		if e := ioutil.WriteFile(filename, []byte(content), 0644); e != nil {
+		if e := ioutil.WriteFile(filename, []byte(content), 0o644); e != nil {
 			return e
 		} // #nosec G306
 	}