diff --git a/.cirrus.yml b/.cirrus.yml
deleted file mode 100644
index 175ba140..00000000
--- a/.cirrus.yml
+++ /dev/null
@@ -1,27 +0,0 @@
-task:
-
-  # only test the main branch and pull requests
-  only_if: $CIRRUS_BRANCH == "main" || $CIRRUS_PR != ""
-
-  matrix:
-    - name: macOS
-      macos_instance:
-        image: ghcr.io/cirruslabs/macos-runner:sequoia
-      environment:
-        CFLAGS: -Werror -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=undefined
-        PATH: /opt/homebrew/opt/llvm/bin:${PATH}
-        UBSAN_OPTIONS: print_stacktrace=1
-      install_script: brew update && brew install coreutils cscope llvm && env PIP_BREAK_SYSTEM_PACKAGES=1 python3 -m pip install pytest
-      test_script: ./misc/ci.sh
-
-    - name: C formatting
-      container:
-        image: silkeh/clang:19
-      install_script: apt-get update -y && apt-get install --no-install-recommends -y git
-      test_script: clang-format --version && git ls-files -z -- ':!:test/cases' '**/*.c' '**/*.h' | xargs -0 -- clang-format --dry-run --style=file --Werror
-
-    - name: Python formatting
-      container:
-        image: cytopia/black
-      install_script: apk add git
-      test_script: git ls-files -z -- ':!:test/cases' '**/*.py' | xargs -0 -- python3 -m black && git diff --exit-code
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 670d5358..ef7193af 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,6 +38,25 @@ jobs:
           ./build/test/find-me/find-me
           cmake --install build
 
+  macos26:
+    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: python3 --version
+      - run: brew update
+      - run: brew install coreutils cscope
+      - 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 --recurse-submodules -- ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} wd
+      - run: >
+          cd wd &&
+          git fetch -- origin ${{ github.event.pull_request.head.sha }} &&
+          git checkout FETCH_HEAD &&
+          env PATH=$(brew --prefix llvm@20)/bin:${PATH} ./misc/ci.sh
+
   ubuntu2604:
     name: Linux
     runs-on: ubuntu-26.04
@@ -74,3 +93,39 @@ jobs:
           git fetch -- origin ${{ github.event.pull_request.head.sha }} &&
           git checkout FETCH_HEAD &&
           ./misc/ci.sh
+
+  c_analysis:
+    name: C analysis
+    runs-on: ubuntu-26.04
+    steps:
+      - run: uname -rms
+      - run: python3 --version
+      - run: clang --version
+      - 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 -- ':!:test/cases' '**/*.c' '**/*.h' |
+          xargs -0 -- clang-format-22 --dry-run --style=file --Werror --
+
+  python_analysis:
+    name: Python analysis
+    runs-on: ubuntu-26.04
+    steps:
+      - run: uname -rms
+      - run: python3 --version
+      - run: python3 -m pip install --user black
+      - 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 -- ':!:test/cases' '**/*.py' |
+          xargs -0 -- python3 -m black -- &&
+          git diff --exit-code