diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index f5029e1..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,78 +0,0 @@
-version: 2.1
-
-orbs:
-  win: circleci/windows@1.0.0
-
-workflows:
-  version: 2
-  test:
-    jobs:
-      - test_linux:
-          name: .NET Core 3.1
-          docker-image: mcr.microsoft.com/dotnet/core/sdk:3.1-focal
-          build-target-framework: netcoreapp3.1
-          test-target-framework: netcoreapp3.1
-      - test_linux:
-          name: .NET 6.0
-          docker-image: mcr.microsoft.com/dotnet/sdk:6.0-focal
-          build-target-framework: net6.0
-          test-target-framework: net6.0
-      - test_windows:
-          name: .NET Framework 4.6.2
-          build-target-framework: net462
-          test-target-framework: net462
-
-jobs:
-  test_linux:
-    parameters:
-      docker-image:
-        type: string
-      build-target-framework:
-        type: string
-      test-target-framework:
-        type: string
-    docker:
-      - image: <<parameters.docker-image>>
-    environment:
-      ASPNETCORE_SUPPRESSSTATUSMESSAGES: true
-      BUILDFRAMEWORKS: <<parameters.build-target-framework>>
-      TESTFRAMEWORK: <<parameters.test-target-framework>>
-    steps:
-      - checkout
-      - run:
-          name: build
-          command: dotnet build src/LaunchDarkly.TestHelpers
-      - run:
-          name: run tests
-          command: |
-            dotnet test \
-              --logger:"junit;LogFilePath=/tmp/circle-reports/unit-tests.xml" \
-              test/LaunchDarkly.TestHelpers.Tests/LaunchDarkly.TestHelpers.Tests.csproj
-      - store_test_results:
-          path: /tmp/circle-reports
-
-  test_windows:
-    parameters:
-      build-target-framework:
-        type: string
-      test-target-framework:
-        type: string
-    executor:
-      name: win/vs2019
-      shell: powershell.exe
-    environment:
-      BUILDFRAMEWORKS: <<parameters.build-target-framework>>
-      TESTFRAMEWORK: <<parameters.test-target-framework>>
-    steps:
-      - checkout
-      - run:
-          name: build
-          command: dotnet build src/LaunchDarkly.TestHelpers
-      - run:
-          name: run tests
-          command: |
-            dotnet test \
-              -l "junit;LogFilePath=/tmp/circle-reports/unit-tests.xml" \
-              test/LaunchDarkly.TestHelpers.Tests/LaunchDarkly.TestHelpers.Tests.csproj
-      - store_test_results:
-          path: /tmp/circle-reports
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..ca7d0dd
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,46 @@
+name: Quality control
+
+on:
+  push:
+    branches: [ main, 'feat/**' ]
+    paths-ignore:
+      - '**.md' # Do not need to run CI for markdown changes.
+  pull_request:
+    branches: [ main, 'feat/**' ]
+    paths-ignore:
+      - '**.md'
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup dotnet build tools
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 6.0
+
+      - run: dotnet restore
+      - run: dotnet build src/LaunchDarkly.TestHelpers -f netstandard2.0
+      - run: dotnet test test/LaunchDarkly.TestHelpers.Tests -f net6.0
+
+  windows:
+    runs-on: windows-latest
+
+    defaults:
+      run:
+        shell: powershell
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup dotnet build tools
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 6.0
+
+      - run: dotnet restore
+      - run: dotnet build src/LaunchDarkly.TestHelpers -f net462
+      - run: dotnet test test/LaunchDarkly.TestHelpers.Tests -f net462
diff --git a/README.md b/README.md
index 665a7d2..5fe606c 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # LaunchDarkly .NET Test Helpers
 
 [![NuGet](https://img.shields.io/nuget/v/LaunchDarkly.TestHelpers.svg?style=flat-square)](https://www.nuget.org/packages/LaunchDarkly.TestHelpers/)
-[![CircleCI](https://circleci.com/gh/launchdarkly/dotnet-test-helpers.svg?style=shield)](https://circleci.com/gh/launchdarkly/dotnet-test-helpers)
+[![Quality control](https://github.com/launchdarkly/dotnet-test-helpers/actions/workflows/ci.yml/badge.svg)](https://github.com/launchdarkly/dotnet-test-helpers/actions/workflows/ci.yml)
 [![Documentation](https://img.shields.io/static/v1?label=GitHub+Pages&message=API+reference&color=00add8)](https://launchdarkly.github.io/dotnet-test-helpers)
 
 This project centralizes some test support code that is used by LaunchDarkly's .NET and Xamarin SDKs and related components, and that may be useful in other .NET projects.