diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4f0ac02..a9feb44 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,8 +13,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04]
-        python-version: ["3.9"]
+        os: [ubuntu-22.04, ubuntu-24.04, macos-15-intel, macos-latest]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
         exclude:
           # macOS latest doesn't support Python 3.9 well on ARM
           - os: macos-latest
diff --git a/README.md b/README.md
index da8c5a4..729ad83 100644
--- a/README.md
+++ b/README.md
@@ -15,13 +15,16 @@
   <a href="https://VirtualPlanetaryLaboratory.github.io/vplanet/conduct.html">
     <img src="https://img.shields.io/badge/Code%20of-Conduct-7d93c7.svg">
   </a>
+  
   <br>
   <img src="https://img.shields.io/badge/Unit%20Tests-55-darkblue.svg">
   <a href="https://github.com/VirtualPlanetaryLaboratory/bigplanet/actions/workflows/tests.yml">
     <img src="https://github.com/VirtualPlanetaryLaboratory/bigplanet/actions/workflows/tests.yml/badge.svg">
   </a>
   <img src="https://img.shields.io/badge/Python-3.9--3.13-orange.svg">
+  [![codecov](https://codecov.io/github/VirtualPlanetaryLaboratory/bigplanet/graph/badge.svg?token=FQEJBL185K)](https://codecov.io/github/VirtualPlanetaryLaboratory/bigplanet)
   <br>
+
   <a href="https://github.com/VirtualPlanetaryLaboratory/bigplanet/actions/workflows/pip-install.yml">
     <img src="https://github.com/VirtualPlanetaryLaboratory/bigplanet/actions/workflows/pip-install.yml/badge.svg">
   </a>