diff --git a/init-loader.el b/init-loader.el
index 0fd1776..5c74c73 100644
--- a/init-loader.el
+++ b/init-loader.el
@@ -3,6 +3,7 @@
 ;; Author: IMAKADO <ken.imakado@gmail.com>
 ;; URL: https://github.com/emacs-jp/init-loader/
 ;; Version: 0.02
+;; Package-Requires: ((cl-lib "0.5"))
 
 ;; This file is free software; you can redistribute it and/or modify
 ;; it under the terms of the GNU General Public License as published by
@@ -78,7 +79,7 @@
 
 ;;; Code:
 
-(eval-when-compile (require 'cl))
+(require 'cl-lib)
 (require 'benchmark)
 
 ;;; customize-variables
@@ -140,11 +141,11 @@ example, 00_foo.el, 01_bar.el ... 99_keybinds.el."
   :type 'regexp)
 
 ;;;###autoload
-(defun* init-loader-load (&optional (init-dir init-loader-directory))
+(cl-defun init-loader-load (&optional (init-dir init-loader-directory))
   "Load configuration files in INIT-DIR."
   (let ((init-dir (init-loader-follow-symlink init-dir))
         (is-carbon-emacs nil))
-    (assert (and (stringp init-dir) (file-directory-p init-dir)))
+    (cl-assert (and (stringp init-dir) (file-directory-p init-dir)))
     (init-loader-re-load init-loader-default-regexp init-dir t)
 
     ;; Windows
@@ -177,7 +178,7 @@ example, 00_foo.el, 01_bar.el ... 99_keybinds.el."
     (when (not window-system)
       (init-loader-re-load init-loader-nw-regexp init-dir))
 
-    (case init-loader-show-log-after-init
+    (cl-case init-loader-show-log-after-init
       (error-only (add-hook 'after-init-hook 'init-loader--show-log-error-only))
       ('t (add-hook 'after-init-hook 'init-loader-show-log)))))
 
@@ -229,13 +230,13 @@ example, 00_foo.el, 01_bar.el ... 99_keybinds.el."
 ;; 2011/JUN/12 zqwell Read first byte-compiled file if it exist.
 ;; See. http://twitter.com/#!/fkmn/statuses/21411277599
 (defun init-loader--re-load-files (re dir &optional sort)
-  (loop for el in (directory-files dir t)
-        when (and (string-match re (file-name-nondirectory el))
-                  (or (string-match "elc\\'" el)
-                      (and (string-match "el\\'" el)
-                           (not (locate-library (concat el "c"))))))
-        collect (file-name-nondirectory el) into ret
-        finally return (if sort (sort ret 'string<) ret)))
+  (cl-loop for el in (directory-files dir t)
+           when (and (string-match re (file-name-nondirectory el))
+                     (or (string-match "elc\\'" el)
+                         (and (string-match "el\\'" el)
+                              (not (locate-library (concat el "c"))))))
+           collect (file-name-nondirectory el) into ret
+           finally return (if sort (sort ret 'string<) ret)))
 
 (defun init-loader--show-log-error-only ()
   (let ((err (init-loader-error-log)))
diff --git a/test-init-loader.el b/test-init-loader.el
index 916a973..7a733a5 100644
--- a/test-init-loader.el
+++ b/test-init-loader.el
@@ -19,9 +19,7 @@
 
 ;;; Code:
 
-(eval-when-compile
-  (require 'cl))
-
+(require 'cl-lib)
 (require 'ert)
 (require 'init-loader)
 
@@ -51,12 +49,11 @@
     "bsd-config.el"
     "bsd-migemo.el"))
 
-;; TODO flet is obsoleted from Emacs 24.3
-
 (ert-deftest init-loader--re-load-files ()
   "Test for `init-loader--re-load-files'"
-  (flet ((directory-files (dir &optional full match nosort)
-                          init-loader-test-files))
+  (cl-letf (((symbol-function #'directory-files)
+             (lambda (dir &optional full match nosort)
+               init-loader-test-files)))
     (let ((got (init-loader--re-load-files init-loader-default-regexp "" t))
           (expected '("00_utils.el" "01_ik-cmd.el" "20_elisp.el"
                       "21_javascript.el" "23_yaml.el" "25_perl.el"
@@ -97,9 +94,9 @@
 
 (ert-deftest init-loader-follow-symlink ()
   "Test for `init-loader-follow-symlink'"
-  (flet ((directory-files (dir &optional full match nosort)
-                          init-loader-test-files))
-
+  (cl-letf (((symbol-function #'directory-files)
+             (lambda (dir &optional full match nosort)
+               init-loader-test-files)))
     (let ((symlink "symlink.el")
           (thisfile "test-init-loader.el"))
       ;; setup
@@ -152,14 +149,18 @@
 (ert-deftest init-loader-load-file ()
   "Test for `init-loader-load-file'"
 
-  (flet ((byte-compile-file (el)
-                            (setq is-byte-compiled t))
-         (load (file)
-               (setq is-loaded t))
-         (delete-file (file)
-                      (setq is-deleted t))
-         (locate-library (lib) lib))
-
+  (cl-letf (((symbol-function #'byte-compile-file)
+             (lambda (el)
+               (setq is-byte-compiled t)))
+            ((symbol-function #'load)
+             (lambda (file &optional noerror nomessage nosuffix must-suffix)
+               (setq is-loaded t)))
+            ((symbol-function #'delete-file)
+             (lambda (file &optional trash)
+               (setq is-deleted t)))
+            ((symbol-function #'locate-library)
+             (lambda (lib &optional nosuffix path interactive-call)
+               lib)))
     ;; not byte compile
     (let ((init-loader-byte-compile nil))
       (init-loader-load-file "foo")