diff --git a/.github/shellcheck-matcher.json b/.github/shellcheck-matcher.json
new file mode 100644
index 0000000..4c97a36
--- /dev/null
+++ b/.github/shellcheck-matcher.json
@@ -0,0 +1,18 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "shellcheck",
+      "severity": "warning",
+      "pattern": [
+        {
+          "regexp": "^(.+):(\\d+):(\\d+):\\s+(note|style|warning|error):\\s+(.+)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "severity": 4,
+          "message": 5
+        }
+      ]
+    }
+  ]
+}
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..23116ec
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,16 @@
+name: lint
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - name: Run shellcheck
+        run: |
+          echo "::add-matcher::.github/shellcheck-matcher.json"
+          find . -name "*.sh" -exec shellcheck --format=gcc --severity=error {} +
diff --git a/nvim/dein.toml b/nvim/dein.toml
index 2d13fde..d6d8798 100644
--- a/nvim/dein.toml
+++ b/nvim/dein.toml
@@ -100,28 +100,6 @@ lua_source = '''
   require('rc.hlchunk')
 '''
 
-[[plugins]]
-repo = 'https://github.com/MeanderingProgrammer/render-markdown.nvim'
-depends = [ 'nvim-treesitter' ]
-on_ft = [ 'markdown', "markdown.mdx", "codecompanion" ]
-lua_source = '''
-require('render-markdown').setup({
-    file_types = { "markdown", "Avante", "codecompanion" },
-})
-'''
-
-# [[plugins]]
-# repo = 'Shougo/deol.nvim'
-# hook_source = '''
-# " Should set g:deol#prompt_pattern.
-# let g:deol#prompt_pattern = has('win32') ? '\f\+>' : '\w*% \?'
-# if !has('win32')
-# 	let g:deol#external_history_path = '~/.zsh_history'
-# endif
-#
-# nnoremap <expr> <Space>s '<Cmd>Deol -edit<CR>'
-# '''
-
 # --- General Rich Text Editing ---
 [[plugins]]
 repo = 'https://github.com/simeji/winresizer'
@@ -305,7 +283,7 @@ require('nvim-ts-autotag').setup()
 
 [[plugins]]
 repo = 'https://github.com/nvim-treesitter/nvim-treesitter'
-on_event = ['BufRead', 'CursorHold']
+rev = 'main'
 merged = 0
 hook_post_update = 'TSUpdate'
 lua_source = '''
@@ -314,7 +292,27 @@ require('rc.treesitter')
 
 [[plugins]]
 repo = 'https://github.com/nvim-treesitter/nvim-treesitter-textobjects'
+rev = 'main'
 depends = ['nvim-treesitter']
+lua_source = '''
+require("nvim-treesitter-textobjects").setup({ select = { lookahead = true } })
+local select = require("nvim-treesitter-textobjects.select")
+local keymaps = {
+  ab   = { "@block.outer",       "Select outer part of a block region" },
+  ib   = { "@block.inner",       "Select inner part of a block region" },
+  ai   = { "@conditional.outer", "Select outer part of a conditional" },
+  ii   = { "@conditional.inner", "Select inner part of a conditional" },
+  al   = { "@loop.outer",        "Select outer part of a loop" },
+  il   = { "@loop.inner",        "Select inner part of a loop" },
+  af   = { "@function.outer",    "Select outer part of a method/function definition" },
+  ["if"] = { "@function.inner",  "Select inner part of a method/function definition" },
+}
+for key, v in pairs(keymaps) do
+  vim.keymap.set({ "x", "o" }, key, function()
+    select.select_textobject(v[1], "textobjects")
+  end, { desc = v[2] })
+end
+'''
 
 # --- Git ---
 [[plugins]]
diff --git a/nvim/lua/rc/lsp/keymap.lua b/nvim/lua/rc/lsp/keymap.lua
index 0a51dde..4c3f666 100644
--- a/nvim/lua/rc/lsp/keymap.lua
+++ b/nvim/lua/rc/lsp/keymap.lua
@@ -1,38 +1,36 @@
 return function()
--- See `:help vim.diagnostic.*` for documentation on any of the below functions
-vim.keymap.set("n", "<Space>df", "<cmd>lua vim.diagnostic.open_float()<CR>", { noremap = true, silent = true })
-vim.keymap.set("n", "[e", function() vim.diagnostic.jump({ count = -1 }) end, { noremap = true, silent = true })
-vim.keymap.set("n", "]e", function() vim.diagnostic.jump({ count = 1 }) end, { noremap = true, silent = true })
-vim.keymap.set("n", "<Space>q", "<cmd>lua vim.diagnostic.setloclist()<CR>", { noremap = true, silent = true })
-vim.keymap.set("n", "<Space>f",
-	function() require("my.utils").keep_cursor(vim.lsp.buf.format) end,
-	{ noremap = true, silent = true })
+	-- diagnostics (LSP 不要なのでグローバル設定)
+	local opts = { noremap = true, silent = true }
+	vim.keymap.set("n", "gs", vim.diagnostic.open_float, opts)
+	vim.keymap.set("n", "[e", function()
+		vim.diagnostic.jump({ count = -1 })
+	end, opts)
+	vim.keymap.set("n", "]e", function()
+		vim.diagnostic.jump({ count = 1 })
+	end, opts)
+	vim.keymap.set("n", "<Space>q", vim.diagnostic.setloclist, opts)
 
+	-- LSP keymaps (LspAttach でバッファローカルに設定)
+	vim.api.nvim_create_autocmd("LspAttach", {
+		callback = function(args)
+			local bufopts = { noremap = true, silent = true, buffer = args.buf }
 
-	local bufopts = { noremap = true, silent = true, buffer = bufnr }
-	-- code reading
-	-- show information at cursor
-	--- 定義情報などを表示する
-	vim.keymap.set("n", "K", vim.lsp.buf.hover, bufopts)
-	--- 関数の引数の内容とかを表示する
-	vim.keymap.set("n", "<c-k>", vim.lsp.buf.signature_help, bufopts)
-	--- カーソル行のエラーを表示
-	vim.keymap.set("n", "gs", vim.diagnostic.open_float, bufopts)
+			-- code reading
+			--- 定義情報などを表示する
+			vim.keymap.set("n", "K", vim.lsp.buf.hover, bufopts)
+			--- 関数の引数の内容とかを表示する
+			vim.keymap.set("n", "<c-k>", vim.lsp.buf.signature_help, bufopts)
 
-	-- code walking
-	--- 前のエラーに移動
-	vim.keymap.set("n", "g[", function() vim.diagnostic.jump({ count = -1 }) end, bufopts)
-	--- 次のエラーに移動
-	vim.keymap.set("n", "g]", function() vim.diagnostic.jump({ count = 1 }) end, bufopts)
+			-- code edit
+			--- 関数名や変数名をリネーム
+			vim.keymap.set("n", "<Space>r", vim.lsp.buf.rename, bufopts)
+			vim.keymap.set("n", "<Space>f", function()
+				require("my.utils").keep_cursor(vim.lsp.buf.format)
+			end, bufopts)
 
-	-- code edit
-	--- 関数名や変数名をリネーム
-	vim.keymap.set("n", "<Space>r", vim.lsp.buf.rename, bufopts)
-
-	-- workspace
-	--- ワークスペース一覧を表示
-	-- vim.keymap.set("n", "<space>wl", "<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>")
-	--- ワークスペースにフォルダを追加する
-	vim.keymap.set("n", "<space>wa", vim.lsp.buf.add_workspace_folder)
-	vim.keymap.set("n", "<space>wr", vim.lsp.buf.remove_workspace_folder)
+			-- workspace
+			vim.keymap.set("n", "<space>wa", vim.lsp.buf.add_workspace_folder, bufopts)
+			vim.keymap.set("n", "<space>wr", vim.lsp.buf.remove_workspace_folder, bufopts)
+		end,
+	})
 end
diff --git a/nvim/lua/rc/treesitter.lua b/nvim/lua/rc/treesitter.lua
index 11d5294..3c2d189 100644
--- a/nvim/lua/rc/treesitter.lua
+++ b/nvim/lua/rc/treesitter.lua
@@ -1,91 +1,22 @@
-require 'nvim-treesitter.configs'.setup {
-	ensure_installed = {
-		"go",
-		"gotmpl",
-		"tsx", "css",
-		"lua",
-		"perl",
-		"markdown", "toml", "yaml", "json",
-	},
-	auto_install = false,
-	sync_install = false, -- install languages synchronously (only applied to `ensure_installed`)
-	highlight = {
-		enable = true, -- false will disable the whole extension
-		disable = { "vim" }, -- list of language that will be disabled
-		additional_vim_regex_highlighting = false,
-	},
-	indent = {
-		enable = true,
-	},
-	context_commentstring = {
-		enable_autocmd = false,
-	},
-	incremental_selection = {
-		enable = true,
-		keymaps = {
-			init_selection = "<CR>",
-			node_incremental = "<CR>",
-			node_decremental = "<S-CR>",
-		},
-	},
-	textobjects = {
-		select = {
-			enable = true,
-			-- Automatically jump forward to textobj, similar to targets.vim
-			lookahead = true,
-			keymaps = {
-				["ab"] = {
-					query = "@block.outer",
-					desc = "Select outer part of a block region"
-				},
-				["ib"] = {
-					query = "@block.inner",
-					desc = "Select inner part of a block region"
-				},
-
-				["ai"] = {
-					query = "@conditional.outer",
-					desc = "Select outer part of a conditional"
-				},
-				["ii"] = {
-					query = "@conditional.inner",
-					desc = "Select inner part of a conditional"
-				},
-
-				["al"] = {
-					query = "@loop.outer",
-					desc = "Select outer part of a loop"
-				},
-				["il"] = {
-					query = "@loop.inner",
-					desc = "Select inner part of a loop"
-				},
+-- Parser installation (new API; replaces ensure_installed)
+local installed = require('nvim-treesitter.config').get_installed()
+local parsers = { "go", "gotmpl", "tsx", "css", "lua", "perl", "markdown", "toml", "yaml", "json" }
+local to_install = vim.iter(parsers)
+	:filter(function(p) return not vim.tbl_contains(installed, p) end)
+	:totable()
+if #to_install > 0 then
+	require('nvim-treesitter').install(to_install)
+end
 
-				["af"] = {
-					query = "@function.outer",
-					desc = "Select outer part of a method/function definition",
-				},
-				["if"] = {
-					query = "@function.inner",
-					desc = "Select inner part of a method/function definition",
-				},
-
-			},
-		},
-	},
-}
-
--- go template engine
--- local parser_config = require 'nvim-treesitter.parsers'.get_parser_configs()
--- parser_config.gotmpl = {
--- 	install_info = {
--- 		url = "https://github.com/ngalaiko/tree-sitter-go-template",
--- 		files = { "src/parser.c" }
--- 	},
--- 	filetype = "gotmpl",
--- 	used_by = { "gohtmltmpl", "gotexttmpl", "gotmpl", "yaml" }
--- }
+-- Highlighting and indentation via Neovim built-in treesitter (0.12+)
+vim.api.nvim_create_autocmd('FileType', {
+	callback = function()
+		pcall(vim.treesitter.start)
+		vim.bo.indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()"
+	end,
+})
 
+-- Filetype detection
 vim.filetype.add({
 	extension = {
 		gotmpl = 'gotmpl',
@@ -100,6 +31,6 @@ vim.filetype.add({
 vim.api.nvim_create_autocmd({ "BufNewFile", "BufRead" }, {
 	pattern = { "*.tmpl" },
 	callback = function()
-			vim.bo.filetype = "gotmpl"
+		vim.bo.filetype = "gotmpl"
 	end,
 })
diff --git a/renovate.json b/renovate.json
new file mode 100644
index 0000000..e71b655
--- /dev/null
+++ b/renovate.json
@@ -0,0 +1,12 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended"],
+  "minimumReleaseAge": "3 days",
+  "packageRules": [
+    {
+      matchDepTypes: ["action"],
+      excludePackagePrefixes: ["actions/"],
+      pinDigests: true,
+    },
+  ],
+}
diff --git a/shlib/bash/bash-completion.sh b/shlib/bash/bash-completion.sh
index 00b229b..d7ab4a4 100644
--- a/shlib/bash/bash-completion.sh
+++ b/shlib/bash/bash-completion.sh
@@ -1,10 +1,12 @@
+# shellcheck shell=bash
 # memo command completion function
 _go_memo(){
+    # shellcheck disable=SC2034  # _get_comp_words_by_ref が参照渡しで設定する
     local prev cur cword
     # get the input informations (ref: /usr/share/bash-completion/bash_completion )
     _get_comp_words_by_ref -n : cur prev cword
     opts="new list edit cat delete grep config serve"
 
-    COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
+    mapfile -t COMPREPLY < <(compgen -W "${opts}" -- "${cur}")
 } &&
 complete -F _go_memo memo
diff --git a/shlib/bash/check-true-color.sh b/shlib/bash/check-true-color.sh
index 42e7941..b869d2e 100644
--- a/shlib/bash/check-true-color.sh
+++ b/shlib/bash/check-true-color.sh
@@ -1,3 +1,4 @@
+#!/bin/sh
 # https://blog.nakanishy.com/truecolor-vim.html
 # なめらかな虹色が表示されればOK
 
diff --git a/shlib/bash/fzf-wrapper.sh b/shlib/bash/fzf-wrapper.sh
index c14de5c..ca21823 100644
--- a/shlib/bash/fzf-wrapper.sh
+++ b/shlib/bash/fzf-wrapper.sh
@@ -1,4 +1,4 @@
-#! /bin/sh -
+#!/usr/bin/env bash
 
 # Usage:
 #   fd depth base-directory
diff --git a/shlib/bash/git-ch-id.sh b/shlib/bash/git-ch-id.sh
index 85b9332..7903033 100644
--- a/shlib/bash/git-ch-id.sh
+++ b/shlib/bash/git-ch-id.sh
@@ -8,5 +8,5 @@ ch-git-name()
 
     opt="s/${oldID}/${newID}/"
 
-    git remote set-url origin `git config --get remote.origin.url | sed "${opt}"`
+    git remote set-url origin "$(git config --get remote.origin.url | sed "${opt}")"
 }
diff --git a/shlib/bash/pathfind.sh b/shlib/bash/pathfind.sh
index cc6d4fe..9b53ba1 100644
--- a/shlib/bash/pathfind.sh
+++ b/shlib/bash/pathfind.sh
@@ -22,6 +22,7 @@
 IFS='
  	'
 # 信頼できる場所からのみプログラムを呼び出すようにする。
+# shellcheck disable=SC2034  # eval経由で参照される
 OLDPATH="$PATH"
 PATH=/bin:/usr/bin
 export PATH
diff --git a/shlib/bash/run-with-color.sh b/shlib/bash/run-with-color.sh
index 0e2d29b..0b5a1b4 100644
--- a/shlib/bash/run-with-color.sh
+++ b/shlib/bash/run-with-color.sh
@@ -19,7 +19,7 @@ cyan=36
 colored() {
     color=$1
     shift
-    echo -e "\033[1;${color}m$@\033[0m"
+    echo -e "\033[1;${color}m$*\033[0m"
 }
 
 run() {
@@ -27,9 +27,9 @@ run() {
     result=$?
 
     if [ $result -ne 0 ]; then
-        echo -n $(colored $red "Faild: ")
-        echo -n $(colored $cyan "$0")
-        echo $(colored $yellow " [$PWD]")
+        echo -n "$(colored $red "Faild: ")"
+        echo -n "$(colored $cyan "$0")"
+        echo "$(colored $yellow " [$PWD]")"
         exit $result
     fi
     return 0
diff --git a/shlib/bash/sample.sh b/shlib/bash/sample.sh
index cdc924e..bb26187 100644
--- a/shlib/bash/sample.sh
+++ b/shlib/bash/sample.sh
@@ -11,7 +11,9 @@ fi
 # passwordの入力等で必ず人出で入力してほしいデータを読み込む場合などに便利なファイル
 printf "New Password"
 stty -echo              # 入力された文字が表示されるのを防ぐ
+# shellcheck disable=SC2034
 read pass < /dev/tty    # パスワードを読み込みます
 printf "Confirm Password"
+# shellcheck disable=SC2034
 read pass2 < /dev/tty   # もう一度パスワードを読み込みます
 stty echo               # 画面表示をもとに戻します。
diff --git a/shlib/common/git-alias.sh b/shlib/common/git-alias.sh
index 63d7c82..df66c96 100644
--- a/shlib/common/git-alias.sh
+++ b/shlib/common/git-alias.sh
@@ -1,3 +1,4 @@
+#!/bin/sh
 git config --global alias.s status
 git config --global alias.d diff
 git config --global alias.b branch
diff --git a/tmux-session.sh b/tmux-session.sh
index 5a5d83f..d4ae3f9 100755
--- a/tmux-session.sh
+++ b/tmux-session.sh
@@ -4,7 +4,6 @@ set -euo pipefail
 # ───────────────────────────────
 # 設定
 # ───────────────────────────────
-GHQ_ROOT=$(ghq root)
 TMP_FILE=$(mktemp)
 
 # ───────────────────────────────