diff --git a/dot_Brewfile b/dot_Brewfile
index 5cce78c..5eac900 100644
--- a/dot_Brewfile
+++ b/dot_Brewfile
@@ -14,6 +14,7 @@ brew "bat"
 brew "berkeley-db"
 brew "betterleaks"
 brew "bottom"
+brew "carapace"
 brew "chezmoi"
 brew "clang-format"
 brew "cloc"
diff --git a/dot_zsh/custom.zsh b/dot_zsh/custom.zsh
index 5ea3995..8fa5679 100644
--- a/dot_zsh/custom.zsh
+++ b/dot_zsh/custom.zsh
@@ -61,69 +61,8 @@ setopt transient_rprompt    #
 # compinit は dot_zshrc で sheldon 読み込み前に実行済み
 zstyle ':completion:*:default' menu select=1
 
-# npm completion
-
-###-begin-npm-completion-###
-# shellcheck disable=SC2207,SC2046,SC2034,SC2162,SC2219
-#
-# npm command completion script
-#
-# Installation: npm completion >> ~/.bashrc  (or ~/.zshrc)
-# Or, maybe: npm completion > /usr/local/etc/bash_completion.d/npm
-#
-
-if type complete &>/dev/null; then
-  _npm_completion() {
-    local words cword
-    if type _get_comp_words_by_ref &>/dev/null; then
-      _get_comp_words_by_ref -n = -n @ -n : -w words -i cword
-    else
-      cword="$COMP_CWORD"
-      words=("${COMP_WORDS[@]}")
-    fi
-
-    local si="$IFS"
-    IFS=$'\n' COMPREPLY=($(COMP_CWORD="$cword" \
-      COMP_LINE="$COMP_LINE" \
-      COMP_POINT="$COMP_POINT" \
-      npm completion -- "${words[@]}" \
-      2>/dev/null)) || return $?
-    IFS="$si"
-    if type __ltrim_colon_completions &>/dev/null; then
-      __ltrim_colon_completions "${words[cword]}"
-    fi
-  }
-  complete -o default -F _npm_completion npm
-elif type compdef &>/dev/null; then
-  _npm_completion() {
-    local si=$IFS
-    compadd -- $(COMP_CWORD=$((CURRENT - 1)) \
-      COMP_LINE=$BUFFER \
-      COMP_POINT=0 \
-      npm completion -- "${words[@]}" \
-      2>/dev/null)
-    IFS=$si
-  }
-  compdef _npm_completion npm
-elif type compctl &>/dev/null; then
-  _npm_completion() {
-    local cword line point words si
-    read -Ac words
-    read -cn cword
-    let cword-=1
-    read -l line
-    read -ln point
-    si="$IFS"
-    IFS=$'\n' reply=($(COMP_CWORD="$cword" \
-      COMP_LINE="$line" \
-      COMP_POINT="$point" \
-      npm completion -- "${words[@]}" \
-      2>/dev/null)) || return $?
-    IFS="$si"
-  }
-  compctl -K _npm_completion npm
-fi
-###-end-npm-completion-###
+# npm / yarn / pnpm の補完は carapace が担当する
+# （sheldon の plugins.carapace で読み込み。旧 `npm completion` 生成コードは削除済み）
 
 # AWS CLI
 # shellcheck disable=SC1091
diff --git a/dot_zshrc b/dot_zshrc
index 989130b..6f9ef27 100644
--- a/dot_zshrc
+++ b/dot_zshrc
@@ -5,7 +5,7 @@ promptinit
 typeset -U fpath
 
 # compinit を sheldon 読み込み前に走らせる
-# （zsh-better-npm-completion 等が source 中に compdef を呼ぶため）
+# （carapace / gibo-completion 等が source 中に compdef を呼ぶため）
 # .zcompdump が24時間以内に更新されていればセキュリティ監査(compaudit)をスキップして高速化
 autoload -Uz compinit
 zcompdump="${ZDOTDIR:-$HOME}/.zcompdump"
diff --git a/private_dot_config/sheldon/plugins.toml b/private_dot_config/sheldon/plugins.toml
index 1d8f8bc..634e291 100644
--- a/private_dot_config/sheldon/plugins.toml
+++ b/private_dot_config/sheldon/plugins.toml
@@ -18,15 +18,23 @@ github = "zsh-users/zsh-autosuggestions"
 [plugins.zsh-history-substring-search]
 github = "zsh-users/zsh-history-substring-search"
 
-[plugins.zsh-better-npm-completion]
-github = "lukechilds/zsh-better-npm-completion"
-
 [plugins.zsh-ssh]
 github = "zpm-zsh/ssh"
 
 [plugins.git-open]
 github = "paulirish/git-open"
 
+# carapace はマルチシェル対応の補完エンジン（約1000コマンドの spec を内蔵）
+# 他の補完プラグインより後に読み込み、compdef を上書きさせる
+# 特定コマンドを zsh 標準の補完に戻したい場合は CARAPACE_EXCLUDES='git,npm' のように指定する
+[plugins.carapace]
+inline = '''
+if command -v carapace &>/dev/null; then
+	zstyle ':completion:*' format $'\e[2;37mCompleting %d\e[m'
+	source <(carapace _carapace)
+fi
+'''
+
 # zsh-syntax-highlighting は最後に読み込む
 # （他プラグインで定義された関数・コマンドもハイライト対象にするため）
 [plugins.zsh-syntax-highlighting]