diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 33ac5d2..221a41c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     env:
       MIX_ENV: test
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -25,8 +25,8 @@ jobs:
 
           # Oldest supported versions
           - pair:
-              elixir: "1.9.4"
-              otp: "20.3.8"
+              elixir: "1.15"
+              otp: "25.3.2"
     steps:
       - name: Check out this repository
         uses: actions/checkout@v3
diff --git a/mix.exs b/mix.exs
index b213db7..2e5dea8 100644
--- a/mix.exs
+++ b/mix.exs
@@ -8,7 +8,7 @@ defmodule NimbleOptions.MixProject do
     [
       app: :nimble_options,
       version: @version,
-      elixir: "~> 1.9",
+      elixir: "~> 1.15",
       start_permanent: Mix.env() == :prod,
       deps: deps(),