diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d46d7ca..47d41e0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     env:
       MIX_ENV: test
     strategy:
@@ -16,11 +16,17 @@ jobs:
       matrix:
         include:
           - pair:
-              elixir: "1.7"
-              otp: "22"
+              elixir: "1.15"
+              otp: "26"
           - pair:
               elixir: "1.18"
               otp: "27"
+          - pair:
+              elixir: "1.19"
+              otp: "28"
+          - pair:
+              elixir: "1.20"
+              otp: "29"
             lint: lint
     steps:
       - uses: actions/checkout@v4
diff --git a/mix.exs b/mix.exs
index f195d7e..da00e7a 100644
--- a/mix.exs
+++ b/mix.exs
@@ -7,7 +7,7 @@ defmodule Flow.Mixfile do
     [
       app: :flow,
       version: @version,
-      elixir: "~> 1.7",
+      elixir: "~> 1.15",
       package: package(),
       description: "Computational parallel flows for Elixir",
       start_permanent: Mix.env() == :prod,