diff --git a/.cirrus.yml b/.cirrus.yml
index 7fb480a..77d8202 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -13,51 +13,3 @@ task:
         UBSAN_OPTIONS: print_stacktrace=1
       install_script: python3 --version && pkg upgrade -y && pkg install -y cmake py311-pytest vim
       test_script: uname -sr && env cmake -B build -S . && cmake --build build && cmake --build build --target check && cmake --install build
-
-    - name: Linux
-      container:
-        image: gcc:14.1
-      environment:
-        DEBIAN_FRONTEND: noninteractive
-        CFLAGS: -Werror -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=undefined -fuse-ld=gold
-        LC_ALL: C.UTF-8
-        UBSAN_OPTIONS: print_stacktrace=1
-      install_script: apt-get update && apt-get install --no-install-recommends -y cmake python3-pytest vim xxd
-      test_script: uname -sr && env && cmake -B build -S . && cmake --build build && cmake --build build --target check && cmake --install build
-
-    - name: Linux, shared libraries
-      container:
-        image: gcc:14.1
-      environment:
-        DEBIAN_FRONTEND: noninteractive
-        CFLAGS: -Werror -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=undefined -fuse-ld=gold
-        LC_ALL: C.UTF-8
-        UBSAN_OPTIONS: print_stacktrace=1
-      install_script: apt-get update && apt-get install --no-install-recommends -y cmake python3-pytest vim xxd
-      test_script: uname -sr && env && cmake -DBUILD_SHARED_LIBS=ON -B build -S . && cmake --build build && cmake --build build --target check && cmake --install build
-
-    - name: Linux, release build
-      container:
-        image: gcc:14.1
-      environment:
-        DEBIAN_FRONTEND: noninteractive
-        CFLAGS: -Werror -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=undefined -fuse-ld=gold
-        LC_ALL: C.UTF-8
-        UBSAN_OPTIONS: print_stacktrace=1
-      install_script: apt-get update && apt-get install --no-install-recommends -y cmake python3-pytest vim xxd
-      test_script: uname -sr && env && cmake -DCMAKE_BUILD_TYPE=Release -B build -S . && cmake --build build && cmake --build build --target check && cmake --install build
-
-    - name: macOS
-      macos_instance:
-        image: ghcr.io/cirruslabs/macos-sonoma-base:latest
-      environment:
-        CFLAGS: -Werror -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=undefined
-        UBSAN_OPTIONS: print_stacktrace=1
-      install_script: brew update && brew install python3 && python3 -m pip install --break-system-packages pytest
-      test_script: uname -sr && env && cmake -B build -S . && cmake --build build && cmake --build build --target check && sudo cmake --install build
-
-    - name: clang-format
-      container:
-        image: silkeh/clang:15
-      install_script: apt-get update && apt-get install --no-install-recommends -y git
-      test_script: git ls-files -z '**/*.c' '**/*.h' | xargs -0 -- clang-format --dry-run --style=file --Werror
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..0f8c77a
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,94 @@
+name: Github Actions CI
+permissions: {}
+on:
+  pull_request:
+    branches:
+      - main
+jobs:
+  linux:
+    name: Linux
+    runs-on: ubuntu-24.04
+    env:
+      DEBIAN_FRONTEND: noninteractive
+      CFLAGS: -Werror -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=address,undefined
+      UBSAN_OPTIONS: print_stacktrace=1
+    steps:
+      - run: uname -rms
+      - run: python3 --version
+      - run: sudo apt-get update
+      - run: sudo apt-get install --no-install-recommends -y python3-pytest vim xxd
+      - run: echo "cloning ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}"
+      - run: git clone --no-checkout -- ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} wd
+      - run: cd wd && git fetch -- origin ${{ github.event.pull_request.head.sha }} && git checkout FETCH_HEAD
+      - run: cmake -B build -S wd
+      - run: cmake --build build
+      - run: cmake --build build --target check
+      - run: sudo cmake --install build
+
+  linux_shared:
+    name: Linux, shared libraries
+    runs-on: ubuntu-24.04
+    env:
+      DEBIAN_FRONTEND: noninteractive
+      CFLAGS: -Werror -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=address,undefined
+      UBSAN_OPTIONS: print_stacktrace=1
+    steps:
+      - run: uname -rms
+      - run: python3 --version
+      - run: sudo apt-get update
+      - run: sudo apt-get install --no-install-recommends -y python3-pytest vim xxd
+      - run: echo "cloning ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}"
+      - run: git clone --no-checkout -- ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} wd
+      - run: cd wd && git fetch -- origin ${{ github.event.pull_request.head.sha }} && git checkout FETCH_HEAD
+      - run: cmake -DBUILD_SHARED_LIBS=ON -B build -S wd
+      - run: cmake --build build
+      - run: cmake --build build --target check
+      - run: sudo cmake --install build
+
+  linux_release:
+    name: Linux, release build
+    runs-on: ubuntu-24.04
+    env:
+      DEBIAN_FRONTEND: noninteractive
+      CFLAGS: -Werror -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=address,undefined
+      UBSAN_OPTIONS: print_stacktrace=1
+    steps:
+      - run: uname -rms
+      - run: python3 --version
+      - run: sudo apt-get update
+      - run: sudo apt-get install --no-install-recommends -y python3-pytest vim xxd
+      - run: echo "cloning ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}"
+      - run: git clone --no-checkout -- ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} wd
+      - run: cd wd && git fetch -- origin ${{ github.event.pull_request.head.sha }} && git checkout FETCH_HEAD
+      - run: cmake -DCMAKE_BUILD_TYPE=Release -B build -S wd
+      - run: cmake --build build
+      - run: cmake --build build --target check
+      - run: sudo cmake --install build
+
+  macos:
+    name: macOS
+    runs-on: macos-26-intel
+    env:
+      CFLAGS: -Werror -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=address,undefined
+      UBSAN_OPTIONS: print_stacktrace=1
+    steps:
+      - run: uname -rms
+      - run: python3 --version
+      - run: env PIP_BREAK_SYSTEM_PACKAGES=1 python3 -m pip install pytest
+      - run: echo "cloning ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}"
+      - run: git clone --no-checkout -- ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} wd
+      - run: cd wd && git fetch -- origin ${{ github.event.pull_request.head.sha }} && git checkout FETCH_HEAD
+      - run: cmake -B build -S wd
+      - run: cmake --build build
+      - run: cmake --build build --target check
+      - run: sudo cmake --install build
+
+  clang_format:
+    name: clang-format
+    runs-on: ubuntu-22.04
+    steps:
+      - run: uname -rms
+      - run: echo "cloning ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}"
+      - run: git clone --no-checkout -- ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} wd
+      - run: cd wd && git fetch -- origin ${{ github.event.pull_request.head.sha }} && git checkout FETCH_HEAD
+      - run: cd wd && git ls-files -z '**/*.c' '**/*.h' | xargs -0 -- clang-format-15 --dry-run --style=file --Werror