最近合作开发的项目，Git拉下来发现CocoaPods管理的三方库中乱成一了锅粥！--！最后发现我的pod版本太低，那就升级呗。
由于之前安装过CocoaPods，淘宝源也没问题，直接终端输入：
$ sudo gem install cocoa pods
结果提示错误如下：
ERROR: While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/pod
经过多方查询，终于找到个靠谱的解决方案（注意：最后的--pre要加上才能更新到最新版本）：
$ sudo gem install -n /usr/local/bin cocoapods --pre
运行结果，完美！
Fetching: cocoapods-core-1.1.0.beta.1.gem (100%)
Successfully installed cocoapods-core-1.1.0.beta.1
Fetching: cocoapods-downloader-1.1.0.gem (100%)
Successfully installed cocoapods-downloader-1.1.0
Fetching: cocoapods-try-1.1.0.gem (100%)
Successfully installed cocoapods-try-1.1.0
Fetching: molinillo-0.5.0.gem (100%)
Successfully installed molinillo-0.5.0
Fetching: xcodeproj-1.2.0.gem (100%)
Successfully installed xcodeproj-1.2.0
Fetching: fourflusher-1.0.1.gem (100%)
Successfully installed fourflusher-1.0.1
Fetching: gh_inspector-1.0.2.gem (100%)
Successfully installed gh_inspector-1.0.2
Fetching: cocoapods-1.1.0.beta.1.gem (100%)
Successfully installed cocoapods-1.1.0.beta.1
Parsing documentation for cocoapods-core-1.1.0.beta.1
Installing ri documentation for cocoapods-core-1.1.0.beta.1
Parsing documentation for cocoapods-downloader-1.1.0
Installing ri documentation for cocoapods-downloader-1.1.0
Parsing documentation for cocoapods-try-1.1.0
Installing ri documentation for cocoapods-try-1.1.0
Parsing documentation for molinillo-0.5.0
Installing ri documentation for molinillo-0.5.0
Parsing documentation for xcodeproj-1.2.0
Installing ri documentation for xcodeproj-1.2.0
Parsing documentation for fourflusher-1.0.1
Installing ri documentation for fourflusher-1.0.1
Parsing documentation for gh_inspector-1.0.2
Installing ri documentation for gh_inspector-1.0.2
Parsing documentation for cocoapods-1.1.0.beta.1
Installing ri documentation for cocoapods-1.1.0.beta.1
8 gems installed
参考链接：CocoaPod遇到更新不了的原因
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