diff --git a/.appveyor.yml b/.appveyor.yml
deleted file mode 100644
index cec7486..0000000
--- a/.appveyor.yml
+++ /dev/null
@@ -1,28 +0,0 @@
-# set clone depth
-clone_depth: 5                  # clone entire repository history if not defined
-
-environment:
-  matrix:
-    - CYG_ARCH: x86
-      CYG_ROOT: C:\cygwin
-      ABI: 32
-    - CYG_ARCH: x86_64
-      CYG_ROOT: C:\cygwin64
-
-install:
-  - '%CYG_ROOT%\setup-%CYG_ARCH%.exe -qnNdO -R %CYG_ROOT% -s http://cygwin.mirror.constant.com -l %CYG_ROOT%/var/cache/setup -P libgmp-devel,zlib-devel'
-  - SET "PATH=%CYG_ROOT%\bin;%PATH%"
-  - git clone https://github.com/gap-system/pkg-ci-scripts.git scripts
-  - bash -lc "cd $APPVEYOR_BUILD_FOLDER && scripts/build_gap.sh"
-
-# scripts that run after cloning repository
-build_script:
-  - bash -lc "cd $APPVEYOR_BUILD_FOLDER && scripts/build_pkg.sh"
-
-test_script:
-  - bash -lc "cd $APPVEYOR_BUILD_FOLDER && scripts/run_tests.sh"
-
-on_success:
-  - bash -lc "cd $APPVEYOR_BUILD_FOLDER && scripts/gather-coverage.sh"
-  - curl -s https://codecov.io/bash > codecov.sh
-  - bash -lc "cd $APPVEYOR_BUILD_FOLDER && ./codecov.sh"
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..6313b56
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text=auto eol=lf
diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 18c3949..2838179 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -44,6 +44,23 @@ jobs:
       - uses: gap-actions/process-coverage@v2
       - uses: codecov/codecov-action@v2
 
+  test-cygwin:
+    name: "master cygwin64 - HPC no"
+    if: ${{ !(github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository) }}
+    runs-on: windows-latest
+    env:
+      CHERE_INVOKING: 1
+    steps:
+      - uses: actions/checkout@v2
+      - uses: gap-actions/setup-cygwin@v1
+      - uses: gap-actions/setup-gap@cygwin-v2
+        with:
+          GAP_PKGS_TO_BUILD: ''
+      - uses: gap-actions/build-pkg@cygwin-v1
+      - uses: gap-actions/run-pkg-tests@cygwin-v2
+        with:
+          NO_COVERAGE: 'yes'
+
   # The documentation job
   manual:
     name: Build manuals
diff --git a/README.md b/README.md
index 937e97a..09fd1b6 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,4 @@
 [![Build Status](https://github.com/gap-packages/ace/workflows/CI/badge.svg?branch=master)](https://github.com/gap-packages/ace/actions?query=workflow%3ACI+branch%3Amaster)
-[![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/github/gap-packages/ace?branch=master&svg=true)](https://ci.appveyor.com/project/gap-packages/ace)
 [![Code Coverage](https://codecov.io/github/gap-packages/ace/coverage.svg)](https://codecov.io/gh/gap-packages/ace)