diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 49e285c..fc3160d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,7 +4,7 @@ on: [push, pull_request]
 jobs:
   build:
     name: Build and test
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     env:
       MIX_ENV: test
     # see https://hexdocs.pm/elixir/compatibility-and-deprecations.html#between-elixir-and-erlang-otp
@@ -12,9 +12,15 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - elixir: 1.19.x
+            otp: 28.x
+            lint: true
+          - elixir: 1.19.x
+            otp: 26.x
           - elixir: 1.18.x
             otp: 27.x
-            lint: true
+          - elixir: 1.18.x
+            otp: 25.x
           - elixir: 1.17.x
             otp: 27.x
           - elixir: 1.17.x
@@ -27,22 +33,6 @@ jobs:
             otp: 26.x
           - elixir: 1.15.x
             otp: 24.x
-          - elixir: 1.14.x
-            otp: 25.x
-          - elixir: 1.14.x
-            otp: 23.x
-          - elixir: 1.13.x
-            otp: 24.x
-          - elixir: 1.13.x
-            otp: 22.x
-          - elixir: 1.12.x
-            otp: 24.x
-          - elixir: 1.12.x
-            otp: 22.x
-          - elixir: 1.11.x
-            otp: 23.x
-          - elixir: 1.11.x
-            otp: 21.x
     steps:
       - uses: actions/checkout@v4
       - uses: erlef/setup-beam@v1
diff --git a/mix.exs b/mix.exs
index 251970c..d2a3e19 100644
--- a/mix.exs
+++ b/mix.exs
@@ -8,7 +8,7 @@ defmodule Params.Mixfile do
     [
       app: :params,
       version: @version,
-      elixir: "~> 1.2",
+      elixir: "~> 1.15",
       name: "Params",
       deps: deps(),
       docs: docs(),
@@ -16,7 +16,7 @@ defmodule Params.Mixfile do
       build_embedded: Mix.env() == :prod,
       start_permanent: Mix.env() == :prod,
       dialyzer: [plt_add_apps: [:ecto]],
-      xref: [exclude: [Ecto.Changeset]]
+      elixirc_options: [no_warn_undefined: [Ecto.Changeset]]
     ]
   end