README.md in ably-1.2.0 vs README.md in ably-1.2.1

@@ -7,10 +7,10 @@
 
 This is a Ruby client library for Ably. The library currently targets the [Ably 1.2 client library specification](https://ably.com/documentation/client-lib-development-guide/features/). You can see the complete list of features this client library supports in [our client library SDKs feature support matrix](https://ably.com/download/sdk-feature-support-matrix).
 
 ## Supported platforms
 
-This SDK supports Ruby 1.9.3+. For eventmachine and Ruby 3.0 note please visit [Ruby 3.0 support](#ruby-30-support) section.
+This SDK supports Ruby 2.7 and 3.x. For eventmachine and Ruby 3.x note please visit [Ruby 3.0 support](#ruby-30-support) section.
 
 As of v1.1.5 this library requires `libcurl` as a system dependency. On most systems this is already installed but in rare cases where it isn't (for example debian-slim Docker images such as ruby-slim) you will need to install it yourself. On debian you can install it with the command `sudo apt-get install libcurl4`.
 
 We regression-test the SDK against a selection of Ruby versions (which we update over time, but usually consists of mainstream and widely used versions). Please refer to [.github/workflows/check.yml](./.github/workflows/check.yml) for the set of versions that currently undergo CI testing.