diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3192f2c..7f6413a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,8 @@ jobs:
             lint: true
           - elixir: '1.16'
             erlang: '26.2.5'
+          - elixir: '1.15'
+            erlang: '25.3.2.13'
     steps:
       - uses: actions/checkout@v4
       - uses: actions/cache@v4
diff --git a/mix.exs b/mix.exs
index 3a7ed67..f3f6216 100644
--- a/mix.exs
+++ b/mix.exs
@@ -5,7 +5,7 @@ defmodule TowerEmail.MixProject do
     [
       app: :tower_email,
       version: "0.1.0",
-      elixir: "~> 1.16",
+      elixir: "~> 1.15",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/test/tower_email_test.exs b/test/tower_email_test.exs
index 3cea989..1d142bb 100644
--- a/test/tower_email_test.exs
+++ b/test/tower_email_test.exs
@@ -33,7 +33,7 @@ defmodule TowerEmailTest do
   @tag capture_log: true
   test "reports long match error" do
     in_unlinked_process(fn ->
-      %{eleven: "eleven"} = %{
+      [eleven: "eleven"] = [
         one: "one",
         two: "two",
         three: "three",
@@ -44,7 +44,7 @@ defmodule TowerEmailTest do
         eight: "eight",
         nine: "nine",
         ten: "ten"
-      }
+      ]
     end)
 
     # TODO: Support waiting on assert_email_sent with a timeout
@@ -54,7 +54,7 @@ defmodule TowerEmailTest do
         :email,
         %{
           subject:
-            ~s([tower_email][test] MatchError: no match of right hand side value: %{one: "one", two: "two", three: "three", four: "f...)
+            ~s([tower_email][test] MatchError: no match of right hand side value: [one: "one", two: "two", three: "three", four: "fo...)
         }
       },
       1_000