diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 5cb6e29..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,34 +0,0 @@
-# iOS CircleCI 2.0 configuration file
-#
-# Check https://circleci.com/docs/2.0/ios-migrating-from-1-2/ for more details
-#
-version: 2
-jobs:
-  build:
-
-    # Specify the Xcode version to use
-    macos:
-      xcode: "10.0.0"
-
-    steps:
-      - checkout
-
-      - run:
-          name: Checkout Dependencies with Carthahge
-          command: carthage bootstrap
-
-      # Build the app and run tests
-      - run:
-          name: Build and run tests
-          command: >
-            set -o pipefail &&
-            xcodebuild -workspace "$WORKSPACE" -scheme "$SCHEME" -sdk "$SDK"
-            -destination "$DESTINATION" -configuration Debug
-            ONLY_ACTIVE_ARCH=NO test | xcpretty -c;
-          environment:
-            LC_CTYPE: en_US.UTF-8
-            LANG: en_US.UTF-8
-            WORKSPACE: JSONAPIModel.xcworkspace
-            SCHEME: JSONAPIModel-iOS
-            SDK: iphonesimulator12.0
-            DESTINATION: "OS=12.0,name=iPhone XS"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..485bf64
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,21 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: macos-26
+    steps:
+      - uses: actions/checkout@v5
+      # Test the Swift package (Package.swift). The legacy Carthage/xcworkspace
+      # setup no longer builds: the Xcode project is missing sources and the
+      # tests rely on SwiftPM's Bundle.module.
+      - name: Build and run tests (iOS Simulator)
+        run: >
+          set -o pipefail &&
+          xcodebuild -workspace .swiftpm/xcode/package.xcworkspace -scheme JSONAPIModel
+          -destination 'platform=iOS Simulator,name=iPhone 17,OS=latest'
+          -configuration Debug test | xcbeautify
diff --git a/README.md b/README.md
index e27d3e6..4234c43 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # JSONAPIModel
 
-[![CircleCI](https://circleci.com/gh/envoy/JSONAPIModel.svg?style=svg)](https://circleci.com/gh/envoy/JSONAPIModel)
+[![CI](https://github.com/envoy/JSONAPIModel/actions/workflows/ci.yml/badge.svg)](https://github.com/envoy/JSONAPIModel/actions/workflows/ci.yml)
 
 Simple JSONAPI parser / serializer and data model