diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f48ac52..b8062f4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,8 +55,10 @@ jobs:
           fi
           echo "✓ Build output matches committed file"
 
-      - name: Run proxy regression checks
-        run: bash scripts/test-socks5h-probes.sh
+      - name: Run regression checks
+        run: |
+          bash scripts/test-socks5h-probes.sh
+          bash scripts/test-claude-bulk-version-commands.sh
 
   js-check:
     name: JS syntax
diff --git a/README.md b/README.md
index b7f3751..671afea 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,8 @@ cac claude install latest               # 安装最新版
 cac claude install 2.1.81               # 安装指定版本
 cac claude ls                           # 列出已安装版本
 cac claude pin 2.1.81                   # 当前环境切换版本
+cac claude update-all latest            # 所有环境切换到最新版
+cac claude prune                        # 卸载未被环境使用的版本
 cac claude uninstall 2.1.81             # 卸载
 ```
 
@@ -121,6 +123,8 @@ cac ls                                  # = cac env ls
 | `cac claude uninstall <ver>` | 卸载版本 |
 | `cac claude ls` | 列出已安装版本 |
 | `cac claude pin <ver>` | 当前环境绑定版本 |
+| `cac claude update-all [latest\|<ver>]` | 所有环境绑定到同一版本 |
+| `cac claude prune` | 卸载未被任何环境使用的版本 |
 | **环境管理** | |
 | `cac env create <name> [-p proxy] [-c ver] [--clone] [--telemetry mode] [--persona preset]` | 创建环境（自动激活，`--telemetry transparent/stealth/paranoid` 控制遥测，`--persona macos-vscode/...` 用于容器） |
 | `cac env ls` | 列出环境 |
@@ -275,6 +279,8 @@ cac claude install latest               # install latest
 cac claude install 2.1.81               # install specific version
 cac claude ls                           # list installed versions
 cac claude pin 2.1.81                   # pin current env to version
+cac claude update-all latest            # pin all envs to latest
+cac claude prune                        # remove versions unused by any env
 cac claude uninstall 2.1.81             # remove
 ```
 
@@ -306,6 +312,8 @@ Each environment is fully isolated:
 | `cac claude uninstall <ver>` | Remove version |
 | `cac claude ls` | List installed versions |
 | `cac claude pin <ver>` | Pin current env to version |
+| `cac claude update-all [latest\|<ver>]` | Pin all environments to one version |
+| `cac claude prune` | Remove versions unused by any environment |
 | **Environment management** | |
 | `cac env create <name> [-p proxy] [-c ver] [--clone] [--telemetry mode] [--persona preset]` | Create environment (auto-activates, `--telemetry transparent/stealth/paranoid` for telemetry control, `--persona macos-vscode/...` for containers) |
 | `cac env ls` | List environments |
diff --git a/cac b/cac
index 60c70cd..7eb9b76 100755
--- a/cac
+++ b/cac
@@ -2915,6 +2915,60 @@ _claude_cmd_uninstall() {
     echo "$(_green_bold "Uninstalled") Claude Code $(_cyan "$ver")"
 }
 
+_claude_cmd_update_all() {
+    local target="${1:-latest}"
+    local ver
+    if [[ "$target" == "latest" ]]; then
+        printf "Fetching latest version ... "
+        ver=$(_fetch_latest_version) || _die "failed to fetch latest version"
+        echo "$(_cyan "$ver")"
+    else
+        ver="$target"
+    fi
+
+    [[ "$ver" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9._-]+)?$ ]] || \
+        _die "invalid version $(_cyan "'$ver'")"
+
+    mkdir -p "$VERSIONS_DIR"
+    _download_version "$ver"
+    _update_latest
+
+    local count=0 env_dir
+    for env_dir in "$ENVS_DIR"/*/; do
+        [[ -d "$env_dir" ]] || continue
+        echo "$ver" > "$env_dir/version"
+        (( count += 1 ))
+    done
+
+    echo "$(_green_bold "Pinned") $count environment(s) -> Claude Code $(_cyan "$ver")"
+}
+
+_claude_cmd_prune() {
+    _update_latest 2>/dev/null || true
+    if [[ ! -d "$VERSIONS_DIR" ]]; then
+        echo "$(_dim "  No versions installed.")"
+        return
+    fi
+
+    local removed=0 ver_dir ver count
+    for ver_dir in "$VERSIONS_DIR"/*/; do
+        [[ -d "$ver_dir" ]] || continue
+        ver=$(basename "$ver_dir")
+        count=$(_envs_using_version "$ver")
+        if [[ "$count" -eq 0 ]]; then
+            rm -rf "${VERSIONS_DIR:?}/$ver"
+            (( removed += 1 ))
+        fi
+    done
+
+    _update_latest 2>/dev/null || true
+    if [[ "$removed" -eq 0 ]]; then
+        echo "$(_dim "  No unused versions to prune.")"
+    else
+        echo "$(_green_bold "Uninstalled") $removed unused version(s)"
+    fi
+}
+
 _claude_cmd_ls() {
     _update_latest 2>/dev/null || true
     if [[ ! -d "$VERSIONS_DIR" ]] || [[ -z "$(ls -A "$VERSIONS_DIR" 2>/dev/null)" ]]; then
@@ -2957,6 +3011,8 @@ cmd_claude() {
     case "${1:-help}" in
         install)    _claude_cmd_install "${@:2}" ;;
         uninstall)  _claude_cmd_uninstall "${@:2}" ;;
+        update-all) _claude_cmd_update_all "${@:2}" ;;
+        prune)      _claude_cmd_prune ;;
         ls|list)    _claude_cmd_ls ;;
         pin)        _claude_cmd_pin "${@:2}" ;;
         help|-h|--help)
@@ -2964,6 +3020,8 @@ cmd_claude() {
             echo
             echo "  $(_bold "install") [latest|<ver>]  Install a Claude Code version"
             echo "  $(_bold "uninstall") <ver>         Remove an installed version"
+            echo "  $(_bold "update-all") [latest|<ver>] Pin all environments to a version"
+            echo "  $(_bold "prune")                   Remove installed versions not used by any environment"
             echo "  $(_bold "ls")                      List installed versions"
             echo "  $(_bold "pin") <ver>               Pin current environment to a version"
             ;;
@@ -3629,6 +3687,8 @@ cmd_help() {
     echo "    $(_green "cac claude install") [latest|ver]   Install Claude Code"
     echo "    $(_green "cac claude ls")                     List installed versions"
     echo "    $(_green "cac claude pin") <ver>              Pin env to a version"
+    echo "    $(_green "cac claude update-all") [latest|ver] Pin all envs to a version"
+    echo "    $(_green "cac claude prune")                  Remove unused versions"
     echo "    $(_green "cac claude uninstall") <ver>        Remove a version"
     echo
 
diff --git a/docs/changelog.mdx b/docs/changelog.mdx
index 3cbc292..93bfe7b 100644
--- a/docs/changelog.mdx
+++ b/docs/changelog.mdx
@@ -5,6 +5,14 @@ description: Release history and notable changes
 
 All notable changes to this project are documented here. Each entry links to the corresponding PR or issue.
 
+## Unreleased
+
+**Feature: bulk Claude Code version management**
+
+- Added `cac claude update-all [latest|<ver>]` to install a target version if needed and pin every environment to it.
+- Added `cac claude prune` to remove installed Claude Code versions that are not used by any environment.
+- Added a shell regression test covering bulk pinning and unused-version pruning.
+
 ## v1.5.7
 <sub>2026-04-27</sub>
 
diff --git a/docs/commands/claude.mdx b/docs/commands/claude.mdx
index d81cba4..5bf4577 100644
--- a/docs/commands/claude.mdx
+++ b/docs/commands/claude.mdx
@@ -49,6 +49,27 @@ cac claude pin 2.1.81
 
 This writes the version to `~/.cac/envs/<name>/version`. The wrapper resolves this file at launch time, so the change takes effect on the next `claude` invocation.
 
+## update-all
+
+Install a target version if needed, then pin every environment to it.
+
+```bash
+cac claude update-all latest
+cac claude update-all 2.1.81
+```
+
+Use this after installing a new Claude Code release when you want all isolated environments to launch the same binary.
+
+## prune
+
+Remove installed versions that are not pinned by any environment.
+
+```bash
+cac claude prune
+```
+
+This is the bulk cleanup equivalent of running `cac claude uninstall <ver>` for every unused version.
+
 ## uninstall
 
 Remove an installed version. Fails if any environment is using it.
diff --git a/docs/zh/changelog.mdx b/docs/zh/changelog.mdx
index adacf0e..d4da608 100644
--- a/docs/zh/changelog.mdx
+++ b/docs/zh/changelog.mdx
@@ -5,6 +5,14 @@ description: 版本发布历史和重要变更
 
 所有重要变更记录在此，每个条目关联对应的 PR 或 Issue。
 
+## Unreleased
+
+**功能：批量管理 Claude Code 版本**
+
+- 新增 `cac claude update-all [latest|<ver>]`，必要时先安装目标版本，然后将所有环境锁定到该版本。
+- 新增 `cac claude prune`，移除未被任何环境使用的已安装 Claude Code 版本。
+- 新增 shell 回归测试，覆盖批量锁定和未使用版本清理。
+
 ## v1.5.7
 <sub>2026-04-27</sub>
 
diff --git a/docs/zh/commands/claude.mdx b/docs/zh/commands/claude.mdx
index c2806c0..a2dfd7a 100644
--- a/docs/zh/commands/claude.mdx
+++ b/docs/zh/commands/claude.mdx
@@ -49,6 +49,27 @@ cac claude pin 2.1.81
 
 这会将版本写入 `~/.cac/envs/<name>/version`。包装器在启动时解析此文件，因此更改会在下次 `claude` 调用时生效。
 
+## update-all
+
+必要时先安装目标版本，然后将所有环境锁定到该版本。
+
+```bash
+cac claude update-all latest
+cac claude update-all 2.1.81
+```
+
+适用于安装新版 Claude Code 后，希望所有隔离环境都启动同一个二进制版本的场景。
+
+## prune
+
+移除未被任何环境锁定的已安装版本。
+
+```bash
+cac claude prune
+```
+
+这相当于对每个未使用版本批量运行 `cac claude uninstall <ver>`。
+
 ## uninstall
 
 移除已安装的版本。如果有环境正在使用该版本，操作会失败。
diff --git a/scripts/test-claude-bulk-version-commands.sh b/scripts/test-claude-bulk-version-commands.sh
new file mode 100755
index 0000000..ed20a73
--- /dev/null
+++ b/scripts/test-claude-bulk-version-commands.sh
@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+CAC="$ROOT/cac"
+TMP="$(mktemp -d)"
+trap 'rm -rf "$TMP"' EXIT
+
+export HOME="$TMP/home"
+CAC_DIR="$HOME/.cac"
+ENVS_DIR="$CAC_DIR/envs"
+VERSIONS_DIR="$CAC_DIR/versions"
+
+make_version() {
+    local ver="$1"
+    mkdir -p "$VERSIONS_DIR/$ver"
+    printf '#!/usr/bin/env bash\nexit 0\n' > "$VERSIONS_DIR/$ver/claude"
+    chmod +x "$VERSIONS_DIR/$ver/claude"
+}
+
+make_env() {
+    local name="$1" ver="$2"
+    mkdir -p "$ENVS_DIR/$name/.claude"
+    printf '%s\n' "$ver" > "$ENVS_DIR/$name/version"
+}
+
+assert_eq() {
+    local expected="$1" actual="$2" label="$3"
+    if [[ "$expected" != "$actual" ]]; then
+        echo "FAIL: $label: expected '$expected', got '$actual'" >&2
+        exit 1
+    fi
+}
+
+assert_exists() {
+    [[ -e "$1" ]] || { echo "FAIL: expected path to exist: $1" >&2; exit 1; }
+}
+
+assert_missing() {
+    [[ ! -e "$1" ]] || { echo "FAIL: expected path to be removed: $1" >&2; exit 1; }
+}
+
+strip_ansi() {
+    perl -pe 's/\e\[[0-9;]*[A-Za-z]//g'
+}
+
+mkdir -p "$ENVS_DIR" "$VERSIONS_DIR"
+make_version "2.1.100"
+make_version "2.1.200"
+make_version "2.1.300"
+make_env "work" "2.1.100"
+make_env "backup" "2.1.100"
+
+UPDATE_OUT="$TMP/cac-update-all.out"
+PRUNE_OUT="$TMP/cac-prune.out"
+
+"$CAC" claude update-all 2.1.200 >"$UPDATE_OUT"
+assert_eq "2.1.200" "$(tr -d '[:space:]' < "$ENVS_DIR/work/version")" "work version"
+assert_eq "2.1.200" "$(tr -d '[:space:]' < "$ENVS_DIR/backup/version")" "backup version"
+strip_ansi < "$UPDATE_OUT" | grep -q "Pinned 2 environment(s) -> Claude Code 2.1.200" || {
+    echo "FAIL: update-all output did not report pinned env count" >&2
+    cat "$UPDATE_OUT" >&2
+    exit 1
+}
+
+"$CAC" claude prune >"$PRUNE_OUT"
+assert_missing "$VERSIONS_DIR/2.1.100"
+assert_exists "$VERSIONS_DIR/2.1.200/claude"
+assert_missing "$VERSIONS_DIR/2.1.300"
+assert_eq "2.1.200" "$(tr -d '[:space:]' < "$VERSIONS_DIR/.latest")" "latest version"
+strip_ansi < "$PRUNE_OUT" | grep -q "Uninstalled 2 unused version(s)" || {
+    echo "FAIL: prune output did not report removed version count" >&2
+    cat "$PRUNE_OUT" >&2
+    exit 1
+}
+
+echo "PASS: claude bulk version commands"
diff --git a/src/cmd_claude.sh b/src/cmd_claude.sh
index c02c5a3..2f48ad9 100644
--- a/src/cmd_claude.sh
+++ b/src/cmd_claude.sh
@@ -97,6 +97,60 @@ _claude_cmd_uninstall() {
     echo "$(_green_bold "Uninstalled") Claude Code $(_cyan "$ver")"
 }
 
+_claude_cmd_update_all() {
+    local target="${1:-latest}"
+    local ver
+    if [[ "$target" == "latest" ]]; then
+        printf "Fetching latest version ... "
+        ver=$(_fetch_latest_version) || _die "failed to fetch latest version"
+        echo "$(_cyan "$ver")"
+    else
+        ver="$target"
+    fi
+
+    [[ "$ver" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9._-]+)?$ ]] || \
+        _die "invalid version $(_cyan "'$ver'")"
+
+    mkdir -p "$VERSIONS_DIR"
+    _download_version "$ver"
+    _update_latest
+
+    local count=0 env_dir
+    for env_dir in "$ENVS_DIR"/*/; do
+        [[ -d "$env_dir" ]] || continue
+        echo "$ver" > "$env_dir/version"
+        (( count += 1 ))
+    done
+
+    echo "$(_green_bold "Pinned") $count environment(s) -> Claude Code $(_cyan "$ver")"
+}
+
+_claude_cmd_prune() {
+    _update_latest 2>/dev/null || true
+    if [[ ! -d "$VERSIONS_DIR" ]]; then
+        echo "$(_dim "  No versions installed.")"
+        return
+    fi
+
+    local removed=0 ver_dir ver count
+    for ver_dir in "$VERSIONS_DIR"/*/; do
+        [[ -d "$ver_dir" ]] || continue
+        ver=$(basename "$ver_dir")
+        count=$(_envs_using_version "$ver")
+        if [[ "$count" -eq 0 ]]; then
+            rm -rf "${VERSIONS_DIR:?}/$ver"
+            (( removed += 1 ))
+        fi
+    done
+
+    _update_latest 2>/dev/null || true
+    if [[ "$removed" -eq 0 ]]; then
+        echo "$(_dim "  No unused versions to prune.")"
+    else
+        echo "$(_green_bold "Uninstalled") $removed unused version(s)"
+    fi
+}
+
 _claude_cmd_ls() {
     _update_latest 2>/dev/null || true
     if [[ ! -d "$VERSIONS_DIR" ]] || [[ -z "$(ls -A "$VERSIONS_DIR" 2>/dev/null)" ]]; then
@@ -139,6 +193,8 @@ cmd_claude() {
     case "${1:-help}" in
         install)    _claude_cmd_install "${@:2}" ;;
         uninstall)  _claude_cmd_uninstall "${@:2}" ;;
+        update-all) _claude_cmd_update_all "${@:2}" ;;
+        prune)      _claude_cmd_prune ;;
         ls|list)    _claude_cmd_ls ;;
         pin)        _claude_cmd_pin "${@:2}" ;;
         help|-h|--help)
@@ -146,6 +202,8 @@ cmd_claude() {
             echo
             echo "  $(_bold "install") [latest|<ver>]  Install a Claude Code version"
             echo "  $(_bold "uninstall") <ver>         Remove an installed version"
+            echo "  $(_bold "update-all") [latest|<ver>] Pin all environments to a version"
+            echo "  $(_bold "prune")                   Remove installed versions not used by any environment"
             echo "  $(_bold "ls")                      List installed versions"
             echo "  $(_bold "pin") <ver>               Pin current environment to a version"
             ;;
diff --git a/src/cmd_help.sh b/src/cmd_help.sh
index 97bb6fc..2030aee 100644
--- a/src/cmd_help.sh
+++ b/src/cmd_help.sh
@@ -18,6 +18,8 @@ cmd_help() {
     echo "    $(_green "cac claude install") [latest|ver]   Install Claude Code"
     echo "    $(_green "cac claude ls")                     List installed versions"
     echo "    $(_green "cac claude pin") <ver>              Pin env to a version"
+    echo "    $(_green "cac claude update-all") [latest|ver] Pin all envs to a version"
+    echo "    $(_green "cac claude prune")                  Remove unused versions"
     echo "    $(_green "cac claude uninstall") <ver>        Remove a version"
     echo