diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ed57a0e..33e0b85 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,59 +7,36 @@ on:
   pull_request:
 
 jobs:
-    test-unix:
-        runs-on: ${{ matrix.os }}
-        strategy:
-            matrix:
-                os: [ubuntu-latest, macos-latest]
-                emacs-version:
-                    - 27.2
-                    - snapshot
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        emacs-version:
+          - 27.2
+          - snapshot
 
-        steps:
-            - uses: actions/checkout@v2
+    steps:
+    - uses: actions/checkout@v2
 
-            - uses: actions/setup-python@v2
-              with:
-                  python-version: "3.6"
-                  architecture: "x64"
+    - uses: purcell/setup-emacs@master
+      if: matrix.os == 'ubuntu-latest' || matrix.os == 'macos-latest'
+      with:
+        version: ${{ matrix.emacs-version }}
 
-            - uses: purcell/setup-emacs@master
-              with:
-                  version: ${{ matrix.emacs-version }}
+    - uses: jcs090218/setup-emacs-windows@master
+      if: matrix.os == 'windows-latest'
+      with:
+        version: ${{ matrix.emacs-version }}
 
-            - uses: cask/setup-cask@master
-              with:
-                  version: 'snapshot'
+    - uses: actions/setup-node@v2
+      with:
+        node-version: '14'
 
-            - name: Run tests
-              run:
-                make ci
+    - uses: emacs-eask/setup-eask@master
+      with:
+        version: 'snapshot'
 
-    test-windows:
-        runs-on: windows-latest
-        strategy:
-            matrix:
-                emacs-version:
-                    - 27.2
-                    - snapshot
-
-        steps:
-            - uses: actions/checkout@v2
-
-            - uses: actions/setup-python@v2
-              with:
-                  python-version: "3.6"
-                  architecture: "x64"
-
-            - uses: jcs090218/setup-emacs-windows@master
-              with:
-                  version: ${{ matrix.emacs-version }}
-
-            - uses: cask/setup-cask@master
-              with:
-                  version: 'snapshot'
-
-            - name: Run tests
-              run:
-                make ci
+    - name: Run tests
+      run:
+        make ci
diff --git a/.gitignore b/.gitignore
index b03b19e..d3f76a4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,12 +1,10 @@
-# ignore these directories.
+# ignore these directories
 /.git
 /recipes
 /test
 vs-dark-theme-pkg.el
 
-# ignore generated files.
+# ignore generated files
 *.elc
 
-# ignore I use to not ignore.
-Update_Log.txt
-TODO(jenchieh).txt
+/.eask
diff --git a/Cask b/Cask
deleted file mode 100644
index 674fa7e..0000000
--- a/Cask
+++ /dev/null
@@ -1,8 +0,0 @@
-(source melpa)
-
-(package-file "vs-dark-theme.el")
-
-(files "vs-dark-theme.el")
-
-(development
- (depends-on "ert-runner"))
diff --git a/Eask b/Eask
new file mode 100644
index 0000000..8c35ead
--- /dev/null
+++ b/Eask
@@ -0,0 +1,9 @@
+(source "melpa")
+
+(package-file "vs-dark-theme.el")
+
+(development
+ (depends-on "ert-runner"))
+
+(setq network-security-level 'low      ; see https://github.com/jcs090218/setup-emacs-windows/issues/156#issuecomment-932956432
+      byte-compile-error-on-warn nil)
diff --git a/Makefile b/Makefile
index cbdee52..7793647 100644
--- a/Makefile
+++ b/Makefile
@@ -1,29 +1,30 @@
 SHELL := /usr/bin/env bash
 
 EMACS ?= emacs
-CASK ?= cask
-
-PKG-FILES := vs-dark-theme.el
+EASK ?= eask
 
 TEST-FILES := $(shell ls test/vs-dark-theme-*.el)
 
-.PHONY: clean checkdoc lint build compile unix-test
+.PHONY: clean checkdoc lint install compile unix-test
 
-ci: clean build compile
+ci: clean install compile
 
-build:
-	$(CASK) install
+clean:
+	@echo "Cleaning..."
+	$(EASK) clean-all
+
+install:
+	@echo "Installing..."
+	$(EASK) install
 
 compile:
 	@echo "Compiling..."
-	@$(CASK) $(EMACS) -Q --batch \
-		-L . \
-		--eval '(setq byte-compile-error-on-warn t)' \
-		-f batch-byte-compile $(PKG-FILES)
+	$(EASK) compile
+
+lint:
+	@echo "Linting..."
+	$(EASK) lint
 
 unix-test:
 	@echo "Testing..."
-	$(CASK) exec ert-runner -L . $(LOAD-TEST-FILES) -t '!no-win' -t '!org'
-
-clean:
-	rm -rf .cask *.elc
+	$(EASK) exec ert-runner -L . $(LOAD-TEST-FILES) -t '!no-win' -t '!org'