diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..3d17831
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,53 @@
+name: ci
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+    env:
+      EMSCRIPTEN_VERSION: '3.1.64'
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install dependencies
+        run: |
+          sudo apt install -y ninja-build \
+            extra-cmake-modules \
+            gettext \
+            marisa
+          ./install-deps.sh
+
+      - name: Install emsdk
+        run: |
+          git clone https://github.com/emscripten-core/emsdk
+          cd emsdk
+          ./emsdk install ${{ env.EMSCRIPTEN_VERSION }}
+          ./emsdk activate ${{ env.EMSCRIPTEN_VERSION }}
+
+      - name: Build
+        run: |
+          . emsdk/emsdk_env.sh
+          python scripts/hallelujah.py
+
+      - name: Release
+        if: ${{ github.ref == 'refs/heads/master' }}
+        uses: 'marvinpinto/action-automatic-releases@latest'
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          automatic_release_tag: latest
+          prerelease: true
+          title: "Nightly Build"
+          files: |
+            build/*.tar.bz2
diff --git a/.gitignore b/.gitignore
index f5c343b..c49feb4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .DS_Store
+*.tar.bz2
 build
 __pycache__
diff --git a/cache/README.md b/cache/README.md
new file mode 100644
index 0000000..ca7e54d
--- /dev/null
+++ b/cache/README.md
@@ -0,0 +1,3 @@
+This directory caches tarball of build dependencies
+(downloaded from [prebuilder](https://github.com/fcitx-contrib/fcitx5-js-prebuilder/releases)),
+which will be extracted to `build/sysroot/usr`.
diff --git a/fcitx5-hallelujah b/fcitx5-hallelujah
index 809a2d4..9eca643 160000
--- a/fcitx5-hallelujah
+++ b/fcitx5-hallelujah
@@ -1 +1 @@
-Subproject commit 809a2d4f980f74fbb658467bd516bef0caed31aa
+Subproject commit 9eca643ea97c28fb5fb19e04e23185bb111592ad
diff --git a/install-deps.sh b/install-deps.sh
new file mode 100755
index 0000000..a7383c3
--- /dev/null
+++ b/install-deps.sh
@@ -0,0 +1,17 @@
+deps=(
+  json-c
+  marisa
+)
+
+EXTRACT_DIR=build/sysroot/usr
+mkdir -p $EXTRACT_DIR
+
+for dep in "${deps[@]}"; do
+  file=$dep.tar.bz2
+  [[ -f cache/$file ]] || wget -P cache https://github.com/fcitx-contrib/fcitx5-js-prebuilder/releases/download/latest/$file
+  tar xjvf cache/$file -C $EXTRACT_DIR
+done
+
+file=fcitx5-js-dev.tar.bz2
+[[ -f cache/$file ]] || wget -P cache https://github.com/fcitx-contrib/fcitx5-js/releases/download/latest/$file
+tar xjvf cache/$file -C $EXTRACT_DIR
diff --git a/patches/hallelujah.patch b/patches/hallelujah.patch
new file mode 100644
index 0000000..43d137b
--- /dev/null
+++ b/patches/hallelujah.patch
@@ -0,0 +1,24 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 02daeea..17cf5c9 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -2,6 +2,10 @@ cmake_minimum_required(VERSION 3.6.0)
+ 
+ project(fcitx5-hallelujah VERSION 5.0.0)
+ 
++set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS TRUE)
++set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-sSIDE_MODULE")
++set(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-sSIDE_MODULE")
++
+ find_package(ECM 1.0.0 REQUIRED)
+ set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${CMAKE_MODULE_PATH})
+ include(FeatureSummary)
+@@ -33,7 +37,7 @@ endif()
+ add_definitions(-DFCITX_GETTEXT_DOMAIN=\"fcitx5-hallelujah\")
+ fcitx5_add_i18n_definition()
+ 
+-include("${FCITX_INSTALL_CMAKECONFIG_DIR}/Fcitx5Utils/Fcitx5CompilerSettings.cmake")
++include("../build/sysroot${FCITX_INSTALL_CMAKECONFIG_DIR}/Fcitx5Utils/Fcitx5CompilerSettings.cmake")
+ 
+ add_subdirectory(src)
+ if (ENABLE_TEST)
diff --git a/scripts/common.py b/scripts/common.py
new file mode 100644
index 0000000..6476a5c
--- /dev/null
+++ b/scripts/common.py
@@ -0,0 +1,72 @@
+import os
+
+INSTALL_PREFIX = '/usr'
+
+
+def ensure(program: str, args: list[str]):
+    command = " ".join([program, *args])
+    print(command)
+    if os.system(command) != 0:
+        raise Exception("Command failed")
+
+
+class Builder:
+    def __init__(self, name: str, options: list[str] | None=None):
+        self.name = name
+        self.root = os.getcwd()
+        self.destdir = f'{self.root}/build/{self.name}'
+        self.options = options or []
+
+    def patch(self):
+        os.chdir(f'{self.root}/fcitx5-{self.name}')
+        file = f'../patches/{self.name}.patch'
+        if os.system('git diff --ignore-submodules --exit-code > /dev/null') == 0 and os.path.isfile(file):
+            ensure('git', ['apply', file])
+        ensure('sed', [
+            '-i',
+            f'"s|\\"/usr/include|\\"{self.root}/build/sysroot/usr/include|g"',
+            '$(find ../build/sysroot/usr -name "*.cmake")'
+        ])
+        ensure('sed', [
+            '-i',
+            f'"s|=/usr/include|={self.root}/build/sysroot/usr/include|g"',
+            '$(find ../build/sysroot/usr -name "*.pc")'
+        ])
+
+    def configure(self):
+        os.environ['PKG_CONFIG_PATH'] = f'{self.root}/build/sysroot/usr/lib/pkgconfig'
+        ensure('emcmake', ['cmake',
+            '-B', 'build', '-G', 'Ninja',
+            f'-DCMAKE_INSTALL_PREFIX={INSTALL_PREFIX}',
+            f'-DCMAKE_FIND_ROOT_PATH="{self.root}/build/sysroot/usr;/usr"',
+            '-DCMAKE_BUILD_TYPE=Release',
+            *self.options
+        ])
+
+    def build(self):
+        ensure('cmake', ['--build', 'build'])
+
+    def install(self):
+        os.environ['DESTDIR'] = self.destdir
+        ensure('cmake', ['--install', 'build'])
+
+    def package(self):
+        os.chdir(f'{self.destdir}{INSTALL_PREFIX}')
+        ensure('tar', ['cjvf', f'{self.destdir}.tar.bz2', '*'])
+
+    def exec(self):
+        self.patch()
+        self.configure()
+        ensure('sed', [
+            '-i',
+            f'"s|-I/usr|-I{self.root}/build/sysroot/usr|g"',
+            'build/build.ninja'
+        ])
+        ensure('sed', [
+            '-i',
+            f'"s|-isystem /usr|-isystem {self.root}/build/sysroot/usr|g"',
+            'build/build.ninja'
+        ])
+        self.build()
+        self.install()
+        self.package()
diff --git a/scripts/hallelujah.py b/scripts/hallelujah.py
new file mode 100644
index 0000000..b757b24
--- /dev/null
+++ b/scripts/hallelujah.py
@@ -0,0 +1,5 @@
+from common import Builder
+
+Builder('hallelujah', [
+    '-DENABLE_TEST=OFF'
+]).exec()