Setting Your Elixir and Erlang Versions

Current defaults	Minimum supported
Elixir 1.16.1 Erlang/OTP 26.2.2 Services created before 2024-03-05 have different default versions. See below.	Elixir 1.12.0 Erlang/OTP 24.3.4 Existing services that use older versions can continue to do so until 2025-07-01. See details.

Elixir version 1.16.1 and Erlang/OTP version 26.2.2 are the defaults for Render services created on or after 2024-03-05.

You can specify your service's Elixir and/or Erlang/OTP version by setting environment variables:

Elixir

Add an environment variable called ELIXIR_VERSION to your service and set its value to a valid version (e.g., 1.14.5).

Supported Elixir versions are listed below.

If you don't also specify an Erlang/OTP version, Render automatically downloads an Erlang runtime that's compatible with your chosen Elixir version.

Supported Elixir versions

+ Click to show versions

• 1.18.3
• 1.18.2
• 1.18.1
• 1.18.0
• 1.17.3
• 1.17.2
• 1.17.1
• 1.17.0
• 1.16.3
• 1.16.2
• 1.16.1
• 1.16.0
• 1.15.8
• 1.15.7
• 1.15.6
• 1.15.5
• 1.15.4
• 1.15.3
• 1.15.2
• 1.15.1
• 1.15.0

Erlang/OTP

Add an environment variable called ERLANG_VERSION to your app and set the value to a valid version (e.g., 24.3.4).

If you set an Erlang/OTP version, make sure it's compatible with your Elixir version!

Supported Erlang/OTP versions are listed below.

Note that 22.2 is a less recent version than 22.2.8, because valid versions are based on tags in the official Erlang repo.

Supported Erlang/OTP versions

+ Click to show versions

• 27.3.3
• 27.3.2
• 27.3.1
• 27.3
• 27.2.4
• 27.2.3
• 27.2.2
• 27.2.1
• 27.2
• 27.1.3
• 27.1.2
• 27.1.1
• 27.1
• 27.0.1
• 27.0
• 26.2.5
• 26.2.4
• 26.2.3
• 26.2.2
• 26.2.1
• 26.2
• 26.1.2
• 26.1.1
• 26.1
• 26.0.2
• 26.0.1
• 26.0
• 25.3.2
• 25.3.1
• 25.3
• 25.2.3
• 25.2.2
• 25.2.1
• 25.2
• 25.1.2
• 25.1.1
• 25.1
• 25.0.4
• 25.0.3
• 25.0.2
• 25.0.1
• 25.0
• 24.3.4
• 24.3.3
• 24.3.2
• 24.3.1
• 24.3
• 24.2.2
• 24.2.1
• 24.2
• 24.1.7
• 24.1.6
• 24.1.5
• 24.1.4
• 24.1.3
• 24.1.2
• 24.1.1
• 24.1
• 24.0.6
• 24.0.5
• 24.0.4
• 24.0.3
• 24.0.2
• 24.0.1
• 24.0
• 23.3.4
• 23.3.3
• 23.3.2
• 23.3.1
• 23.3
• 23.2.7
• 23.2.6
• 23.2.5
• 23.2.4
• 23.2.3
• 23.2.2
• 23.2.1
• 23.2
• 23.1.5
• 23.1.4
• 23.1.3
• 23.1.2
• 23.1.1
• 23.1
• 23.0.4
• 23.0.3
• 23.0.2
• 23.0.1
• 23.0
• 22.3.4
• 22.3.3
• 22.3.2
• 22.3.1
• 22.3
• 22.2.8
• 22.2.7
• 22.2.6
• 22.2.5
• 22.2.4
• 22.2.3
• 22.2.2
• 22.2.1
• 22.2
• 22.1.8
• 22.1.7
• 22.1.6
• 22.1.5
• 22.1.4
• 22.1.3
• 22.1.2
• 22.1.1
• 22.1
• 22.0.7
• 22.0.6
• 22.0.5
• 22.0.4
• 22.0.3
• 22.0.2
• 22.0.1
• 22.0
• 21.3.8
• 21.3.7
• 21.3.6
• 21.3.5
• 21.3.4
• 21.3.3
• 21.3.2
• 21.3.1
• 21.3
• 21.2.7
• 21.2.6
• 21.2.5
• 21.2.4
• 21.2.3
• 21.2.2
• 21.2.1
• 21.2
• 21.1.4
• 21.1.3
• 21.1.2
• 21.1.1
• 21.1
• 21.0.9
• 21.0.8
• 21.0.7
• 21.0.6
• 21.0.5
• 21.0.4
• 21.0.3
• 21.0.2
• 21.0.1
• 21.0
• 20.3.8
• 20.3.7
• 20.3.6
• 20.3.5
• 20.3.4
• 20.3.3
• 20.3.2
• 20.3.1
• 20.3
• 20.2.4
• 20.2.3
• 20.2.2
• 20.2.1
• 20.2
• 20.1.7
• 20.1.6
• 20.1.5
• 20.1.4
• 20.1.3
• 20.1.2
• 20.1.1
• 20.1
• 20.0.5
• 20.0.4
• 20.0.3
• 20.0.2
• 20.0.1
• 20.0
• 19.3.6
• 19.3.5
• 19.3.4
• 19.3.3
• 19.3.2
• 19.3.1
• 19.3
• 19.2.3
• 19.2.2
• 19.2.1
• 19.2
• 19.1.6
• 19.1.5
• 19.1.4
• 19.1.3
• 19.1.2
• 19.1.1
• 19.1
• 19.0.7
• 19.0.6
• 19.0.5
• 19.0.4
• 19.0.3
• 19.0.2
• 19.0.1
• 19.0
• 18.3.4
• 18.3.3
• 18.3.2
• 18.3.1
• 18.3
• 18.2.4
• 18.2.3
• 18.2.2
• 18.2.1
• 18.2
• 18.1.5
• 18.1.4
• 18.1.3
• 18.1.2
• 18.1.1
• 18.1
• 18.0.3
• 18.0.2
• 18.0.1
• 18.0
• 17.5.6
• 17.5.5
• 17.5.4
• 17.5.3
• 17.5.2
• 17.5.1
• 17.5
• 17.4.1
• 17.4
• 17.3.4
• 17.3.3
• 17.3.2
• 17.3.1
• 17.3
• 17.2.2
• 17.2.1
• 17.2
• 17.1.2
• 17.1.1
• 17.1
• 17.0.2
• 17.0.1
• 17.0

History of default Elixir versions

If you don't set an Elixir version for your service, Render's default version depends on when you originally created the service:

Service Creation Date	Default Elixir Version
2024-03-05 and later	1.16.1
2023-11-01 to 2024-03-05	1.15.6
Before 2023-11-01	1.9.4