diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 19901e4..924400b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,8 +16,8 @@ jobs:
       matrix:
         include:
           - pair:
-              elixir: 1.7.4
-              otp: 22.3.4
+              elixir: 1.10.4
+              otp: 21.3
           - pair:
               elixir: 1.11.4
               otp: 23.2.7
diff --git a/mix.exs b/mix.exs
index d6f83e8..e78a2a3 100644
--- a/mix.exs
+++ b/mix.exs
@@ -9,7 +9,7 @@ defmodule Plug.Cowboy.MixProject do
     [
       app: :plug_cowboy,
       version: @version,
-      elixir: "~> 1.7",
+      elixir: "~> 1.10",
       deps: deps(),
       package: package(),
       description: @description,