diff --git a/.github/workflows/test_windows.yml b/.github/workflows/test_windows.yml
new file mode 100644
index 0000000..c3a0080
--- /dev/null
+++ b/.github/workflows/test_windows.yml
@@ -0,0 +1,27 @@
+# Run tests on Windows.
+name: test_windows
+on: [push, pull_request]
+permissions: read-all
+jobs:
+  test_windows:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+        - os: windows-2025
+          python-version: '3.14'
+          toxenv: 'py314'
+    steps:
+    - uses: actions/checkout@v6
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v6
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: 'pip'
+    - name: Install tox
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install tox tox-gh-actions
+    - name: Run tests
+      run: |
+        tox -e ${{ matrix.toxenv }}
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index 8fd32db..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,28 +0,0 @@
-environment:
-  matrix:
-  - DESCRIPTION: "Run tests on Windows with 32-bit Python 3.14"
-    MACHINE_TYPE: "x86"
-    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
-    PYTHON: "C:\\Python314"
-    PYTHON_VERSION: "3.14"
-    L2TBINARIES_TRACK: "dev"
-    TARGET: tests
-  - DESCRIPTION: "Run tests on Windows with 64-bit Python 3.14"
-    MACHINE_TYPE: "amd64"
-    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
-    PYTHON: "C:\\Python314-x64"
-    PYTHON_VERSION: "3.14"
-    L2TBINARIES_TRACK: "dev"
-    TARGET: tests
-
-install:
-- ps: .\config\appveyor\install.ps1
-
-build: off
-
-test_script:
-- cmd: IF [%TARGET%]==[tests] (
-    "%PYTHON%\\python.exe" run_tests.py &&
-    IF EXIST "tests\\end-to-end.py" (
-        set PYTHONPATH=. &&
-        "%PYTHON%\\python.exe" "tests\\end-to-end.py" --debug -c "config\\end-to-end.ini" ) )
diff --git a/config/appveyor/install.ps1 b/config/appveyor/install.ps1
deleted file mode 100644
index 2ef3266..0000000
--- a/config/appveyor/install.ps1
+++ /dev/null
@@ -1,27 +0,0 @@
-# Script to set up tests on AppVeyor Windows.
-
-$Dependencies = "PyYAML dfdatetime dtfabric libcreg libregf"
-
-If ($Dependencies.Length -gt 0)
-{
-	$Dependencies = ${Dependencies} -split " "
-
-	$Output = Invoke-Expression -Command "git clone https://github.com/log2timeline/l2tdevtools.git ..\l2tdevtools 2>&1" | %{ "$_" }
-	Write-Host (${Output} | Out-String)
-
-	If ($env:APPVEYOR_REPO_BRANCH -eq "main")
-	{
-		$Track = "stable"
-	}
-	Else
-	{
-		$Track = $env:APPVEYOR_REPO_BRANCH
-	}
-	New-Item -ItemType "directory" -Name "dependencies"
-
-	$env:PYTHONPATH = "..\l2tdevtools"
-
-	$Output = Invoke-Expression -Command "& '${env:PYTHON}\python.exe' ..\l2tdevtools\tools\update.py --download-directory dependencies --machine-type ${env:MACHINE_TYPE} --track ${env:L2TBINARIES_TRACK} ${Dependencies} 2>&1" | %{ "$_" }
-	Write-Host (${Output} | Out-String)
-}
-
diff --git a/tox.ini b/tox.ini
index c79e60b..d12b761 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,6 @@
 envlist = py3{10,11,12,13,14},black,coverage,docformatter,docs,pylint,wheel,yamllint
 
 [testenv]
-allowlist_externals = ./run_tests.py
 pip_pre = True
 passenv =
   CFLAGS
@@ -17,7 +16,7 @@ deps =
     setuptools >= 65
     wheel
 commands =
-  py3{10,11,12,13,14}: ./run_tests.py
+  py3{10,11,12,13,14}: python run_tests.py
   coverage: coverage erase
   coverage: coverage run --source=dfwinreg --omit="*_test*,*__init__*,*test_lib*" run_tests.py
   coverage: coverage xml