diff --git a/clidocstool.go b/clidocstool.go
index a9d2f64..5b25de0 100644
--- a/clidocstool.go
+++ b/clidocstool.go
@@ -65,7 +65,7 @@ func New(opts Options) (*Client, error) {
 	} else {
 		c.target = opts.TargetDir
 	}
-	if err := os.MkdirAll(c.target, 0755); err != nil {
+	if err := os.MkdirAll(c.target, 0o755); err != nil {
 		return nil, err
 	}
 	return c, nil
diff --git a/clidocstool_md.go b/clidocstool_md.go
index a35b62d..46c2d09 100644
--- a/clidocstool_md.go
+++ b/clidocstool_md.go
@@ -94,7 +94,7 @@ func (c *Client) GenMarkdownTree(cmd *cobra.Command) error {
 		}); err != nil {
 			return err
 		}
-		if err = os.WriteFile(targetPath, icBuf.Bytes(), 0644); err != nil {
+		if err = os.WriteFile(targetPath, icBuf.Bytes(), 0o644); err != nil {
 			return err
 		}
 	} else if err := copyFile(sourcePath, targetPath); err != nil {