diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 471a9b9..b10c38c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,8 @@ jobs:
           - elixir: '1.16'
             erlang: '26.2.5'
             lint: true
+          - elixir: '1.15'
+            erlang: '25.3.2.12'
     steps:
       - uses: actions/checkout@v4
       - uses: actions/cache@v4
diff --git a/mix.exs b/mix.exs
index 4e8ed30..6315a3a 100644
--- a/mix.exs
+++ b/mix.exs
@@ -10,7 +10,7 @@ defmodule TowerRollbar.MixProject do
       app: :tower_rollbar,
       description: @description,
       version: @version,
-      elixir: "~> 1.16",
+      elixir: "~> 1.15",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
       package: package(),