diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 00000000..2a9f11c9
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,57 @@
+name: Python package
+on:
+  push: {}
+  schedule:
+    - cron: "0 0 * * 1-5"
+jobs:
+  test:
+    name: "Test Python ${{ matrix.python-version }}"
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: "Install hatch"
+        run: "pip install hatch"
+      - name: "Run tests"
+        run: "hatch -v run test.py$(echo ${{ matrix.python-version }} | tr -d '.'):pytest"
+
+  lint-style:
+    name: "Style linter"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+      - name: "Install hatch"
+        run: "pip install hatch"
+      - name: "Run style linter"
+        run: "hatch -v run lint:style"
+
+  lint-typing:
+    name: "Typing linter"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+      - name: "Install hatch"
+        run: "pip install hatch"
+      - name: "Run typing linter"
+        run: "hatch -v run lint:typing"
+
+  lint-git:
+    name: "Git linter (Lintje)"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Fetch depth is required
+      - uses: lintje/action@v0.11
diff --git a/.semaphore/semaphore.yml b/.semaphore/semaphore.yml
deleted file mode 100644
index 999aaaf3..00000000
--- a/.semaphore/semaphore.yml
+++ /dev/null
@@ -1,65 +0,0 @@
-version: v1.0
-name: AppSignal for Python
-auto_cancel:
-  running:
-    when: branch != 'main' AND branch != 'develop'
-agent:
-  machine:
-    type: e1-standard-2
-    os_image: ubuntu2004
-global_job_config:
-  prologue:
-    commands:
-    - checkout
-blocks:
-- name: Linters
-  dependencies: []
-  task:
-    jobs:
-    - name: Style
-      commands:
-      - "sem-version python 3.11"
-      - "pip install hatch"
-      - "hatch -v run lint:style"
-    - name: Typing
-      commands:
-      - "sem-version python 3.11"
-      - "pip install hatch"
-      - "hatch -v run lint:typing"
-    - name: Git Lint (Lintje)
-      commands:
-      - script/lint_git
-- name: Tests
-  dependencies: []
-  task:
-    jobs:
-    - name: Diagnose tests
-      env_vars:
-        - name: LANGUAGE
-          value: python
-      commands:
-        - "sem-version python 3.11"
-        - "pip install hatch"
-        - git submodule init
-        - git submodule update
-        - ./tests/diagnose/bin/test
-    - name: Python 3.8
-      commands:
-      - "sem-version python 3.8"
-      - "pip install hatch"
-      - "hatch -v run test.py38:pytest"
-    - name: Python 3.9
-      commands:
-      - "sem-version python 3.9"
-      - "pip install hatch"
-      - "hatch -v run test.py39:pytest"
-    - name: Python 3.10
-      commands:
-      - "sem-version python 3.10"
-      - "pip install hatch"
-      - "hatch -v run test.py310:pytest"
-    - name: Python 3.11
-      commands:
-      - "sem-version python 3.11"
-      - "pip install hatch"
-      - "hatch -v run test.py311:pytest"
diff --git a/pyproject.toml b/pyproject.toml
index 72b93bde..887b3bc6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,6 +20,7 @@ classifiers = [
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
   # Application version
@@ -72,7 +73,7 @@ dependencies = [
 ]
 
 [[tool.hatch.envs.test.matrix]]
-python = ["38", "39", "310", "311"]
+python = ["38", "39", "310", "311", "312"]
 
 [tool.hatch.envs.lint]
 detached = true
diff --git a/script/lint_git b/script/lint_git
deleted file mode 100755
index 11cf375b..00000000
--- a/script/lint_git
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/bin/bash
-
-set -eu
-
-LINTJE_VERSION="0.11.3"
-
-mkdir -p "$HOME/bin"
-cache_key=v1-lintje-$LINTJE_VERSION
-cache restore $cache_key
-
-# File exists and is executable
-if [ -x "$HOME/bin/lintje" ]; then
-  echo "Restored Lintje $LINTJE_VERSION from cache"
-else
-  echo "Downloading Lintje $LINTJE_VERSION"
-  curl -L \
-    https://github.com/lintje/lintje/releases/download/v$LINTJE_VERSION/x86_64-unknown-linux-gnu.tar.gz | \
-    tar -xz --directory "$HOME/bin"
-  cache store $cache_key "$HOME/bin/lintje"
-fi
-
-"$HOME/bin/lintje" "$SEMAPHORE_GIT_COMMIT_RANGE"