diff --git a/README.md b/README.md
index 445197c..e31a37a 100644
--- a/README.md
+++ b/README.md
@@ -12,14 +12,14 @@ Please read [help](doc/ddc.txt) for details.
 Ddc is the abbreviation of "dark deno-powered completion". It provides an
 extensible and asynchronous completion framework for Vim/Neovim.
 
-NOTE: I have created
-[Japanese article](https://zenn.dev/shougo/articles/ddc-vim-beta) for ddc.vim.
-After that I have created the next article
-[Japanese article](https://zenn.dev/shougo/articles/ddc-vim-pum-vim) for both
-ddc.vim and pum.vim recently. You can read them by translation service.
+NOTE: I have created [Japanese
+article](https://zenn.dev/shougo/articles/ddc-vim-beta) for ddc.vim. After that
+I have created the next article [Japanese
+article](https://zenn.dev/shougo/articles/ddc-vim-pum-vim) for both ddc.vim and
+pum.vim recently. You can read them by translation service.
 
-The development is supported by
-[github sponsors](https://github.com/sponsors/Shougo/). Thank you!
+The development is supported by [github
+sponsors](https://github.com/sponsors/Shougo/). Thank you!
 
 <!-- vim-markdown-toc GFM -->
 
@@ -48,13 +48,14 @@ Please see: https://github.com/Shougo/ddc.vim/issues/32
 
 ![nvim-lsp](https://user-images.githubusercontent.com/41495/129931010-258d3917-7379-4b40-b3cc-2313c9fbe600.png)
 
-![command line completion](https://user-images.githubusercontent.com/41495/135711007-8c24c606-2c5d-41f5-a445-dce0127aa97a.png)
+![command line
+completion](https://user-images.githubusercontent.com/41495/135711007-8c24c606-2c5d-41f5-a445-dce0127aa97a.png)
 
 ## Install
 
-**NOTE:** Ddc.vim requires Neovim (0.8.0+ and of course, **latest** is
-recommended) or Vim 9.0+. See [requirements](#requirements) if you aren't sure
-whether you have this.
+**NOTE:** Ddc.vim requires Neovim (0.10.0+ and of course, **latest** is
+recommended) or Vim 9.1.0448+. See [requirements](#requirements) if you aren't
+sure whether you have this.
 
 ### Requirements
 
diff --git a/autoload/ddc/denops.vim b/autoload/ddc/denops.vim
index deef246..e67d54d 100644
--- a/autoload/ddc/denops.vim
+++ b/autoload/ddc/denops.vim
@@ -3,9 +3,9 @@ function ddc#denops#_init(opts = {}) abort
     return
   endif
 
-  if !has('patch-9.0.1276') && !has('nvim-0.8')
+  if !has('patch-9.1.0448') && !has('nvim-0.10')
     call ddc#util#print_error(
-          \ 'ddc requires Vim 9.0.1276+ or neovim 0.8.0+.')
+          \ 'ddc requires Vim 9.1.0448+ or neovim 0.10.0+.')
     return
   endif
 
diff --git a/doc/ddc.txt b/doc/ddc.txt
index d04e8d2..8ac3e94 100644
--- a/doc/ddc.txt
+++ b/doc/ddc.txt
@@ -50,7 +50,7 @@ It does not work with zero configuration.  You can use other plugins.
 ==============================================================================
 INSTALL                                                          *ddc-install*
 
-NOTE: Ddc.vim requires Neovim (0.8.0+) or Vim 9.0.1276+ (latest is
+NOTE: Ddc.vim requires Neovim (0.10.0+) or Vim 9.1.0448+ (latest is
 recommended).
 
 Please install both Deno 1.45+ and "denops.vim" v7.0+.