diff --git a/README.md b/README.md
index 06121e5..a6b6a4e 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ Split a string to a list of strings of a character by the unicode codepoint.
 It requires module Uutf.
 
 ## Dependencies
- - OCaml >= 4.13
+ - OCaml >= 4.06
  - dune
  - uutf
  - fildlib