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SSL Certificate Updates

RubyGems 2.6.8 and newer have improved SSL error messages to help you diagnose your problems. Always make sure you download the latest released version.

UPDATE 2014-12-21: RubyGems 1.8.30, 2.0.15, and 2.2.3 have been released. It requires manual installation, please see instructions below.


You’ve probably reached this page after encountering the following SSL error when trying to pull updates from RubyGems:

SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

This error is produced by changes in infrastructure. You can read the background below. Please follow the instructions below to update your RubyGems:

Installing using update packages

Now that RubyGems 2.6.x has been released, you can manually update to this version.

Download the latest RubyGems

Please download the file in a directory that you can later point to (eg. your home directory, ~, or the root of your harddrive, C:\)

Now, using your Command Prompt:

C:\>gem install --local C:\rubygems-update-2.6.10.gem

After this, gem --version should report the new update version.

You can now safely uninstall rubygems-update gem:

C:\>gem uninstall rubygems-update -x
Removing update_rubygems
Successfully uninstalled rubygems-update-2.6.10

If this process does not work for you, you can try manually adding the new certificate.


For those who are not familiar with SSL/TLS and certificates, there are many parts involved in securely serving content.

SSL certificates are used on the website, which are obtained from a certificate authority (CA) and generated from a private key, along with its respective signature.

Previously, RubyGems’ certificates used SHA-1 to provide a digest (or checksum) of the private key without distributing the key itself (remember, these need to remain private).

SHA-1 has been found to be weak, and a lot of websites have been upgrading to the more secure SHA-2 (specifically SHA-256 or higher).

Specific problem with RubyGems

The particular case with RubyGems (the command line tool) is that it has to bundle the trusted certificates with the code. This allows RubyGems to establish a connection with the servers even when the operating system it is ran on does not have these certificates.

Previously, this certificate was provided by one Certificate Authority, but the new certificate is provided by a different one.

Because of this, verions of RubyGems with both certificates were released, in an attempt to simplify the change.

However, at the scale RubyGems operates at, it’s impossible to make sure everybody updates the software. There are also operating systems shipping with old versions. As such, sometimes manual intervention (as described above) is required.

This has been described on Issue #1050

We had discussed also on IRC, and patches and backports were provided to all major branches of RubyGems: 1.8, 2.0, 2.2, and 2.4

You can find the commits associated with these changes here:

Problem is, only RubyGems 2.4.4 got released, leaving Ruby installation with 1.8, 2.0 and 2.2 in a broken state.

Specially since RubyGems 2.4 is broken on Windows.

Please understand this could happen to anyone. Release multiple versions of any software in a short span of time and be very time sensitive is highly complicated.

Even if we have official releases of any of the versions that correct the issue, it will not be possible install those via RubyGems (chicken-egg problem described before).

Once official releases are out, installation might be simpler. In the meantime, please proceed using the instructions described below.

Manual solution to SSL issue

If the above approach didn’t work for you, you can attempt to manually fix the problem by adding the new trust certificate.

The steps are as follows:

  • Step 1: Obtain the new trust certificate
  • Step 2: Locate RubyGems certificate directory in your installation
  • Step 3: Copy new trust certificate
  • Step 4: Profit

Step 1: Obtain the new trust certificate

We need to download the new trust certificate, GlobalSignRootCA.pem.

Use the above link and place/save this file somewhere you can later find easily (eg. your Desktop).

IMPORTANT: File must have .pem as extension. Browsers like Chrome will try to save it as plain text file. Ensure you change the filename to end with .pem after you have downloaded it.

Step 2: Locate RubyGems certificate directory in your installation

In order for us copy this file, we need to know where to put it.

Depending on where you installed Ruby, the directory will be different.

Take for example the default installation of Ruby 2.1.5, placed in C:\Ruby21

Open a Command Prompt and type in:

C:\>gem which rubygems

Now, let’s locate that directory. From within the same window, enter the path part up to the file extension, but using backslashes instead:

C:\>start C:\Ruby21\lib\ruby\2.1.0\rubygems

This will open a Explorer window inside the directory we indicated.

Step 3: Copy new trust certificate

Now, locate ssl_certs directory and copy the .pem file we obtained from previous step inside.

It will be listed with other files like AddTrustExternalCARoot.pem..


You should now be able to install Ruby gems without issues now.

If you’re still encountering issues, you can open an issue on GitHub.