"Upgrading from 2.1.0":#v2_1_0
+h3. New spelling of S3 credential configs
+
+If you use the S3 driver for Keep volumes and specify credentials in your configuration file (as opposed to using an IAM role), you should change the spelling of the @AccessKey@ and @SecretKey@ config keys to @AccessKeyID@ and @SecretAccessKey@. If you don't update them, the previous spellings will still be accepted, but warnings will be logged at server startup.
+
h3. New proxy parameters for arvados-controller
In your Nginx configuration file (@/etc/nginx/conf.d/arvados-api-and-controller.conf@), add the following lines to the @location /@ block with @http://controller@ (see "Update nginx configuration":{{site.baseurl}}/install/install-api-server.html#update-nginx for an example) and reload/restart Nginx (@sudo nginx -s reload@).
Now that Python 3 is part of the base repository in CentOS 7, the Python 3 dependency for Centos7 Arvados packages was changed from SCL rh-python36 to python3.
+h3. ForceLegacyAPI14 option removed
+
+The ForceLegacyAPI14 configuration option has been removed. In the unlikely event it is mentioned in your config file, remove it to avoid "deprecated/unknown config" warning logs.
+
h2(#v2_1_0). v2.1.0 (2020-10-13)
"Upgrading from 2.0.0":#v2_0_0
A satellite cluster that delegates its user login to a central user database must only have `Login.LoginCluster` set, or it will return an error. This is a change in behavior, previously it would return an error if another login provider was _not_ configured, even though the provider would never be used.
+h3. Minimum supported Python version is now 3.5
+
+We no longer publish Python 2 based distribution packages for our Python components. There are equivalent packages based on Python 3, but their names are slightly different. If you were using the Python 2 based packages, you can install the Python 3 based package for a drop in replacement. On Debian and Ubuntu:
+
+<pre>
+ apt remove python-arvados-fuse && apt install python3-arvados-fuse
+ apt remove python-arvados-python-client && apt install python3-arvados-python-client
+ apt remove python-arvados-cwl-runner && apt install python3-arvados-cwl-runner
+ apt remove python-crunchstat-summary && apt install python3-crunchstat-summary
+ apt remove python-cwltest && apt install python3-cwltest
+</pre>
+
+On CentOS:
+
+<pre>
+ yum remove python-arvados-fuse && yum install python3-arvados-fuse
+ yum remove python-arvados-python-client && yum install python3-arvados-python-client
+ yum remove python-arvados-cwl-runner && yum install python3-arvados-cwl-runner
+ yum remove python-crunchstat-summary && yum install python3-crunchstat-summary
+ yum remove python-cwltest && yum install python3-cwltest
+</pre>
+
h3. Minimum supported Ruby version is now 2.5
The minimum supported Ruby version is now 2.5. If you are running Arvados on Debian 9 or Ubuntu 16.04, you may need to switch to using RVM or upgrade your OS. See "Install Ruby and Bundler":../install/ruby.html for more information.