diff --git a/mrbgems/mruby-sleep/README.md b/mrbgems/mruby-sleep/README.md
index ff24a20fc..d1492aead 100644
--- a/mrbgems/mruby-sleep/README.md
+++ b/mrbgems/mruby-sleep/README.md
@@ -26,4 +26,4 @@ usleep(10000)
 
 under the MIT License:
 
-- <https://www.opensource.org/licenses/mit-license.php>
+- <https://opensource.org/license/mit>