diff --git a/README.md b/README.md
index 879838a..a704ebe 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ sure whether you have this.
 
 ### Requirements
 
-Ddu.vim requires both Deno 1.38+ and denops.vim.
+Ddu.vim requires both Deno 1.40+ and denops.vim.
 
 - <https://deno.land/>
 - <https://github.com/vim-denops/denops.vim>
diff --git a/doc/ddu.txt b/doc/ddu.txt
index 6c4bcbe..25c52e7 100644
--- a/doc/ddu.txt
+++ b/doc/ddu.txt
@@ -67,7 +67,7 @@ INSTALL                                                          *ddu-install*
 NOTE: ddu.vim requires Neovim (0.8.0+) or Vim 9.0.1276+ (latest is
 recommended).
 
-Please install both Deno 1.38+ and "denops.vim".
+Please install both Deno 1.40+ and "denops.vim".
 
 https://deno.land/
 https://github.com/vim-denops/denops.vim
@@ -1607,6 +1607,9 @@ A: The example is here. >
 ==============================================================================
 COMPATIBILITY                                              *ddu-compatibility*
 
+2024.04.07
+* Deno 1.40+ is required.
+
 2024.01.19
 * Change "ddu#redraw()" interface.