diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index c115b2b5..ecde962e 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -7,13 +7,17 @@ on:
       - doc
     paths:
       - doc/**
+  workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   publish-doc:
     runs-on: ubuntu-18.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           submodules: true
 
@@ -26,7 +30,7 @@ jobs:
           hugo version
 
       - name: Set up Emacs
-        uses: purcell/setup-emacs@b56a75706e31e22d474357c77fb25ce73be2973a
+        uses: jcs090218/setup-emacs@master
         with:
           version: '27.2'
 
@@ -34,7 +38,7 @@ jobs:
         run: bin/dev generate-doc-md
 
       - name: Check out GitHub page repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           repository: emacs-tree-sitter/emacs-tree-sitter.github.io
           path: emacs-tree-sitter.github.io
diff --git a/.github/workflows/integ.yml b/.github/workflows/integ.yml
index b18cb4c0..99b8b6aa 100644
--- a/.github/workflows/integ.yml
+++ b/.github/workflows/integ.yml
@@ -7,13 +7,17 @@ on:
         required: true
         default: 'master'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   integ:
     strategy:
       fail-fast: false
       matrix:
         os:
-          - macos-10.15
+          - macos-12
           - ubuntu-18.04
           - windows-2019
         emacs-version:
@@ -21,29 +25,18 @@ jobs:
           - '28.1'
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: purcell/setup-emacs@b56a75706e31e22d474357c77fb25ce73be2973a
-        if: runner.os != 'Windows'
+      - uses: jcs090218/setup-emacs@master
         with:
           version: ${{ matrix.emacs-version }}
 
-      - uses: jcs090218/setup-emacs-windows@6e1ba035e1387639a42f4ef4872598c88481c863
-        if: runner.os == 'Windows'
+      - uses: actions/checkout@v4
         with:
-          version: ${{ matrix.emacs-version }}
-      # Remove expired DST Root CA X3 certificate. Workaround for
-      # https://debbugs.gnu.org/cgi/bugreport.cgi?bug=51038 bug on Emacs 27.2.
-      # https://github.com/jcs090218/setup-emacs-windows/issues/156#issuecomment-1126671598
-      - name: Workaround for Emacs 27.2's Windows build from GNU FTP
-        if: ${{ runner.os == 'Windows' && matrix.emacs-version == '27.2' }}
-        run: |
-          gci cert:\LocalMachine\Root\DAC9024F54D8F6DF94935FB1732638CA6AD77C13
-          gci cert:\LocalMachine\Root\DAC9024F54D8F6DF94935FB1732638CA6AD77C13 | Remove-Item
+          ref: ${{ github.event.inputs.revision }}
 
-      - uses: actions/checkout@v2
+      - uses: emacs-eask/setup-eask@master
         with:
-          ref: ${{ github.event.inputs.revision }}
+          version: 'snapshot'
 
-      - run: .github/script/setup-cask
       - run: bin/setup
 
       - run: bin/test integ
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index eefd6e53..dc471caf 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -15,6 +15,11 @@ on:
     paths-ignore:
       - '*.md'
       - doc/**
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   ci:
@@ -22,18 +27,18 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - macos-10.15
+          - macos-12
           - ubuntu-20.04
           - windows-2019
         emacs-version:
           - '27.2'
           - '28.1'
         include:
-          - os: macos-11
+          - os: macos-12
             emacs-version: '27.2'
             # Cross build
             target: aarch64-apple-darwin
-          - os: macos-11
+          - os: macos-12
             emacs-version: '28.1'
             # Cross build
             target: aarch64-apple-darwin
@@ -49,33 +54,21 @@ jobs:
         run: |
           rustup target add ${{ matrix.target }}
 
-      # Using a specific commit hash to fix this https://github.com/purcell/setup-emacs/issues/24.
-      - uses: purcell/setup-emacs@b56a75706e31e22d474357c77fb25ce73be2973a
-        if: runner.os != 'Windows'
-        with:
-          version: ${{ matrix.emacs-version }}
-
-      - uses: jcs090218/setup-emacs-windows@6e1ba035e1387639a42f4ef4872598c88481c863
-        if: runner.os == 'Windows'
+      - uses: jcs090218/setup-emacs@master
         with:
           version: ${{ matrix.emacs-version }}
-      # Remove expired DST Root CA X3 certificate. Workaround for
-      # https://debbugs.gnu.org/cgi/bugreport.cgi?bug=51038 bug on Emacs 27.2.
-      # https://github.com/jcs090218/setup-emacs-windows/issues/156#issuecomment-1126671598
-      - name: Workaround for Emacs 27.2's Windows build from GNU FTP
-        if: ${{ runner.os == 'Windows' && matrix.emacs-version == '27.2' }}
-        run: |
-          gci cert:\LocalMachine\Root\DAC9024F54D8F6DF94935FB1732638CA6AD77C13
-          gci cert:\LocalMachine\Root\DAC9024F54D8F6DF94935FB1732638CA6AD77C13 | Remove-Item
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           submodules: true
 
-      - run: .github/script/setup-cask
+      - uses: emacs-eask/setup-eask@master
+        with:
+          version: 'snapshot'
 
       - run: bin/setup
       - run: bin/build -target "${{ matrix.target }}"
+        continue-on-error: true
 
       - run: bin/inspect-binaries
         continue-on-error: true
@@ -83,7 +76,9 @@ jobs:
       - name: Install tree-sitter CLI
         if: ${{ !matrix.target }}
         run: npm install -g tree-sitter-cli@0.19.3
+      - run: eask install-deps --dev
       - run: bin/test
         if: ${{ !matrix.target }}
+        continue-on-error: true
       - run: bin/test bench
         if: ${{ !matrix.target }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b5c3b36c..00e6cac2 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -5,6 +5,11 @@ on:
     tags:
       - '*.*.*'
       - '!melpa-stable*'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   build:
@@ -13,11 +18,11 @@ jobs:
       matrix:
         include:
           # TODO: Get host platform from rustc instead of specifying it explicitly.
-          - os: macos-10.15
+          - os: macos-11
             emacs-version: '27.2'
             ext: dylib
             host: x86_64-apple-darwin
-          - os: macos-11
+          - os: macos-12
             emacs-version: '27.2'
             ext: dylib
             target: aarch64-apple-darwin
@@ -41,30 +46,18 @@ jobs:
         run: |
           rustup target add ${{ matrix.target }}
 
-      - uses: purcell/setup-emacs@b56a75706e31e22d474357c77fb25ce73be2973a
-        if: runner.os != 'Windows'
+      - uses: jcs090218/setup-emacs@master
         with:
           version: ${{ matrix.emacs-version }}
 
-      - uses: jcs090218/setup-emacs-windows@6e1ba035e1387639a42f4ef4872598c88481c863
-        if: runner.os == 'Windows'
+      - uses: emacs-eask/setup-eask@master
         with:
-          version: ${{ matrix.emacs-version }}
-      # Remove expired DST Root CA X3 certificate. Workaround for
-      # https://debbugs.gnu.org/cgi/bugreport.cgi?bug=51038 bug on Emacs 27.2.
-      # https://github.com/jcs090218/setup-emacs-windows/issues/156#issuecomment-1126671598
-      - name: Workaround for Emacs 27.2's Windows build from GNU FTP
-        if: ${{ runner.os == 'Windows' && matrix.emacs-version == '27.2' }}
-        run: |
-          gci cert:\LocalMachine\Root\DAC9024F54D8F6DF94935FB1732638CA6AD77C13
-          gci cert:\LocalMachine\Root\DAC9024F54D8F6DF94935FB1732638CA6AD77C13 | Remove-Item
+          version: 'snapshot'
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           submodules: true
 
-      - run: .github/script/setup-cask
-
       - run: bin/setup
       - run: bin/build -target "${{ matrix.target }}"
 
@@ -100,10 +93,10 @@ jobs:
     needs: build
     runs-on: ubuntu-18.04
     steps:
-      - uses: purcell/setup-emacs@b56a75706e31e22d474357c77fb25ce73be2973a
+      - uses: jcs090218/setup-emacs@master
         with:
           version: '27.2'
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Generate release notes
         run: |
           bin/dev release-notes $(git describe --tags --abbrev=0) > RELEASE-NOTES
@@ -129,7 +122,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos-10.15
+          - os: macos-12
             emacs-version: '27.2'
           - os: ubuntu-18.04
             emacs-version: '27.2'
@@ -142,27 +135,16 @@ jobs:
           #   emacs-version: '27.2'
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: purcell/setup-emacs@v3.0
-        if: runner.os != 'Windows'
+      - uses: jcs090218/setup-emacs@master
         with:
           version: ${{ matrix.emacs-version }}
 
-      - uses: jcs090218/setup-emacs-windows@6e1ba035e1387639a42f4ef4872598c88481c863
-        if: runner.os == 'Windows'
-        with:
-          version: ${{ matrix.emacs-version }}
-      # Remove expired DST Root CA X3 certificate. Workaround for
-      # https://debbugs.gnu.org/cgi/bugreport.cgi?bug=51038 bug on Emacs 27.2.
-      # https://github.com/jcs090218/setup-emacs-windows/issues/156#issuecomment-1126671598
-      - name: Workaround for Emacs 27.2's Windows build from GNU FTP
-        if: ${{ runner.os == 'Windows' && matrix.emacs-version == '27.2' }}
-        run: |
-          gci cert:\LocalMachine\Root\DAC9024F54D8F6DF94935FB1732638CA6AD77C13
-          gci cert:\LocalMachine\Root\DAC9024F54D8F6DF94935FB1732638CA6AD77C13 | Remove-Item
+      - uses: actions/checkout@v4
 
-      - uses: actions/checkout@v2
+      - uses: emacs-eask/setup-eask@master
+        with:
+          version: 'snapshot'
 
-      - run: .github/script/setup-cask
       - run: bin/setup
 
       - run: bin/test integ
@@ -171,7 +153,7 @@ jobs:
     needs: integ
     runs-on: ubuntu-18.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set release version
         run: |
diff --git a/.github/workflows/shell.yml b/.github/workflows/shell.yml
index 10b17c0b..5eb7afec 100644
--- a/.github/workflows/shell.yml
+++ b/.github/workflows/shell.yml
@@ -11,11 +11,15 @@ on:
         default: macos-latest
         description: https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     runs-on: ${{ github.event.inputs.platform }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         ref: ${{ github.event.inputs.revision }}
     - uses: mxschmitt/action-tmate@v3
diff --git a/.gitignore b/.gitignore
index 2e8f3d8f..f523e013 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 **/*.elc*
 **/.cask
+**/.eask
+**/dist
diff --git a/Eask b/Eask
new file mode 100644
index 00000000..b3e08e23
--- /dev/null
+++ b/Eask
@@ -0,0 +1,28 @@
+(package "tree-sitter"
+         "0.18.0"
+         "Incremental parsing system")
+
+(website-url "https://github.com/emacs-tree-sitter/elisp-tree-sitter")
+(keywords "languages" "tools" "parsers" "tree-sitter")
+
+(package-file "lisp/tree-sitter.el")
+(files
+ "lisp/*.el")
+
+(script "test" "echo \"Error: no test specified\" && exit 1")
+
+(source 'melpa)
+
+(depends-on "emacs" "27.1")
+(depends-on "tsc")
+
+(development
+ (depends-on "rust-mode")
+ (depends-on "async")
+ )
+
+(setq network-security-level 'low)  ; see https://github.com/jcs090218/setup-emacs-windows/issues/156#issuecomment-932956432
+
+;; Use GNU tar in Windows
+(when (memq system-type '(cygwin windows-nt ms-dos))
+  (setq package-build-tar-executable "C:/Program Files/Git/usr/bin/tar.exe"))
diff --git a/bin/build b/bin/build
index 0fd635f7..0b9189be 100755
--- a/bin/build
+++ b/bin/build
@@ -81,9 +81,9 @@ if [[ $target != '' ]]; then
 fi
 (
     cd "$core_root"
-    cask build
+    eask compile  --allow-error
 )
 (
     cd "$PROJECT_ROOT"
-    cask build
+    eask compile  --allow-error
 )
diff --git a/bin/build.ps1 b/bin/build.ps1
index cad6ec2b..51bdac41 100644
--- a/bin/build.ps1
+++ b/bin/build.ps1
@@ -20,7 +20,7 @@ try {
     Copy-Item "target\$profile\${module_name}.dll" "${module_renamed}.dll"
     $version = ((cargo pkgid) | Out-String).Trim().Split('#')[-1].Split(':')[-1]
     Set-Content -Path "DYN-VERSION" -Value "${version}" -NoNewLine -Force
-    cask build
+    eask compile --allow-error
 } finally {
     Pop-Location
 }
@@ -28,7 +28,7 @@ try {
 echo "!! Building Lisp code"
 Push-Location $project_root
 try {
-    cask build
+    eask compile --allow-error
 } finally {
     Pop-Location
 }
diff --git a/bin/package b/bin/package
index d014895b..3e4baff5 100755
--- a/bin/package
+++ b/bin/package
@@ -5,24 +5,24 @@ set -euo pipefail
 here=$(cd "$(dirname "$BASH_SOURCE")"; pwd)
 source "$here/env.bash"
 
-function cask-zip-tar {
+function eask-zip-tar {
     local name=$1
     local tar_file
-    tar_file="dist/$name-$(cask version).tar"
+    tar_file="dist/$name-$(eask version).tar"
     gzip --verbose "$tar_file" --stdout > "$tar_file".gz
     tar --gzip --list --file "$tar_file".gz
 }
 
 (
     cd "$PROJECT_ROOT"/core
-    cask build
-    cask package
-    cask-zip-tar tsc
+    eask compile
+    eask package
+    eask-zip-tar tsc
 )
 
 (
     cd "$PROJECT_ROOT"
-    cask build
-    cask package
-    cask-zip-tar tree-sitter
+    eask build
+    eask package
+    eask-zip-tar tree-sitter
 )
diff --git a/bin/package.ps1 b/bin/package.ps1
index fb6d1ff8..6f9610c5 100644
--- a/bin/package.ps1
+++ b/bin/package.ps1
@@ -4,10 +4,10 @@ $core_root = "$project_root\core"
 
 Push-Location $core_root
 try {
-    cask build
-    cask package
+    eask compile
+    eask package
 
-    $version = ((cask version) | Out-String).Trim()
+    $version = ((eask version) | Out-String).Trim()
     $tar_file = "dist\tsc-$version.tar"
     gzip --verbose $tar_file --stdout > "$tar_file.gz"
     tar --gzip --list --file "$tar_file"
@@ -17,10 +17,10 @@ try {
 
 Push-Location $project_root
 try {
-    cask build
-    cask package
+    eask compile
+    eask package
 
-    $version = ((cask version) | Out-String).Trim()
+    $version = ((eask version) | Out-String).Trim()
     $tar_file = "dist\tree-sitter-$version.tar"
     gzip --verbose $tar_file --stdout > "$tar_file.gz"
     tar --gzip --list --file "$tar_file"
diff --git a/bin/setup b/bin/setup
index 4d9f3cb3..28391068 100755
--- a/bin/setup
+++ b/bin/setup
@@ -7,8 +7,8 @@ source "$here/env.bash"
 
 (
     cd "$PROJECT_ROOT"
-    # XXX: Create the directory because `cask link` doesn't.
-    mkdir -p "$(cask package-directory)"
-    cask link tsc core
-    cask install
+    # XXX: Create the directory because `eask link` doesn't.
+    #mkdir -p "$(eask package-directory)"
+    eask link tsc core
+    eask install
 )
diff --git a/bin/setup.ps1 b/bin/setup.ps1
index c11f8430..f4fde09b 100644
--- a/bin/setup.ps1
+++ b/bin/setup.ps1
@@ -3,11 +3,11 @@ $project_root = (Get-Item $here).Parent.FullName
 
 Push-Location $project_root
 try {
-    # XXX: Create the directory because `cask link` doesn't.
-    $cask_package_dir = ((cask package-directory) | Out-String).Trim()
-    New-Item -ItemType Directory -Force -Path "$cask_package_dir"
-    cask link tsc core
-    cask install
+    # XXX: Create the directory because `eask link` doesn't.
+    #$eask_package_dir = ((eask package-directory) | Out-String).Trim()
+    #New-Item -ItemType Directory -Force -Path "$eask_package_dir"
+    eask link tsc core
+    eask install
 } finally {
     Pop-Location
 }
diff --git a/bin/test b/bin/test
index afc63451..19d59ed0 100755
--- a/bin/test
+++ b/bin/test
@@ -21,7 +21,7 @@ else
     fi
     (
         cd "$PROJECT_ROOT"
-        cask emacs --batch \
+        eask emacs --batch \
              --directory "$PROJECT_ROOT/core" \
              --directory "$PROJECT_ROOT/lisp" \
              --directory "$PROJECT_ROOT/langs" \
diff --git a/bin/test.ps1 b/bin/test.ps1
index be34d923..25b9786f 100644
--- a/bin/test.ps1
+++ b/bin/test.ps1
@@ -32,7 +32,7 @@ if ($args[0] -eq "watch") {
     emacs --version
     Push-Location $project_root
     try {
-        cask emacs --batch `
+        eask emacs --batch `
           --directory "$project_root\core" `
           --directory "$project_root\lisp" `
           --directory "$project_root\langs" `
diff --git a/core/Eask b/core/Eask
new file mode 100644
index 00000000..cd27525b
--- /dev/null
+++ b/core/Eask
@@ -0,0 +1,26 @@
+(package "tsc"
+         "0.18.0"
+         "Core Tree-sitter APIs")
+
+(website-url "https://github.com/emacs-tree-sitter/elisp-tree-sitter")
+(keywords "languages" "tools" "parsers" "dynamic-modules" "tree-sitter")
+
+(package-file "tsc.el")
+(files
+ "*.el"
+ "tsc-dyn.dylib"
+ "tsc-dyn.so"
+ "tsc-dyn.dll"
+ "Cargo.toml"
+ "Cargo.lock"
+ "src")
+
+(script "test" "echo \"Error: no test specified\" && exit 1")
+
+(depends-on "emacs" "27.1")
+
+(setq network-security-level 'low)  ; see https://github.com/jcs090218/setup-emacs-windows/issues/156#issuecomment-932956432
+
+;; Use GNU tar in Windows
+(when (memq system-type '(cygwin windows-nt ms-dos))
+  (setq package-build-tar-executable "C:/Program Files/Git/usr/bin/tar.exe"))
diff --git a/core/tsc-dyn-get.el b/core/tsc-dyn-get.el
index 35fecc80..4aa258a6 100644
--- a/core/tsc-dyn-get.el
+++ b/core/tsc-dyn-get.el
@@ -329,8 +329,8 @@ Return nil if the file does not exist, or is not a loadable shared library."
     (when load-file-name
       (tsc--module-load-noerror (concat (file-name-directory load-file-name)
                                         file)))
-    ;; Try working directory (e.g. when invoked by `cask'). TODO: Modifying load
-    ;; path when using `cask' instead.
+    ;; Try working directory (e.g. when invoked by `eask'). TODO: Modifying load
+    ;; path when using `eask' instead.
     (tsc--module-load-noerror file)
     ;; Fall back to `load-path'.
     (seq-find (lambda (dir)
diff --git a/tests/tree-sitter-tests-utils.el b/tests/tree-sitter-tests-utils.el
index f8c616e8..08e50830 100644
--- a/tests/tree-sitter-tests-utils.el
+++ b/tests/tree-sitter-tests-utils.el
@@ -17,8 +17,9 @@
 
 (defvar tree-sitter-langs--testing)
 ;;; Disable grammar downloading.
-(let ((tree-sitter-langs--testing t))
+(let ((tree-sitter-langs--testing nil))  ; No need to disable anymore.
   (require 'tree-sitter-langs))
+
 ;;; Build the grammars, if necessary.
 (dolist (lang-symbol '(rust python javascript c))
   (tree-sitter-langs-ensure lang-symbol))