diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fd25276..8eeff6e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -6,30 +6,40 @@ on:
   pull_request:
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
-  unix-test:
+  test:
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest]
+        os:
+          - ubuntu-latest
+          # TODO: Test other OSs!
+          #- macos-latest
+          #- windows-latest
         emacs-version:
           - 27.2
-          - 28.1
-          - 29.3
+          - 28.2
           - 29.4
+
     steps:
       - uses: actions/checkout@v4
+
       - uses: taiki-e/install-action@v2
         with:
           tool: just@1.16.0
-      - uses: purcell/setup-emacs@master
+
+      - uses: jcs090218/setup-emacs@master
         with:
           version: ${{ matrix.emacs-version }}
 
-      - uses: cask/setup-cask@v1
+      - uses: emacs-eask/setup-eask@master
         with:
-          version: 0.9.0
+          version: 'snapshot'
 
       - name: Install requirements
         run: |
diff --git a/.gitignore b/.gitignore
index f062b08..8b51124 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
 *.elc
 /.cask
+/.eask
+/dist
 /config.mk
 *autoloads.el
 test/test-project/target
diff --git a/Cask b/Cask
deleted file mode 100644
index cd3fe0f..0000000
--- a/Cask
+++ /dev/null
@@ -1,13 +0,0 @@
-(source gnu)
-(source melpa)
-
-(package-file "rustic.el")
-
-(development
- (depends-on "rust-mode" "1.0.2")
- (depends-on "spinner")
- (depends-on "ert-runner")
- (depends-on "lsp-mode")
- (depends-on "flycheck")
- (depends-on "f")
- (depends-on "project" "0.3.0"))
diff --git a/Eask b/Eask
new file mode 100644
index 0000000..29567c6
--- /dev/null
+++ b/Eask
@@ -0,0 +1,26 @@
+(package "rustic"
+         "3.5"
+         "Rust development environment")
+
+(package-file "rustic.el")
+
+(files "rustic-*.el")
+
+(source 'gnu)
+(source 'melpa)
+
+(depends-on "rust-mode" "1.0.6")
+(depends-on "dash")
+(depends-on "f")
+(depends-on "markdown-mode")
+(depends-on "s")
+(depends-on "spinner")
+(depends-on "xterm-color")
+(depends-on "flycheck")
+(depends-on "project" "0.3.0")
+
+(development
+ (depends-on "ert-runner")
+ (depends-on "lsp-mode"))
+
+(setq network-security-level 'low)  ; see https://github.com/jcs090218/setup-emacs-windows/issues/156#issuecomment-932956432
diff --git a/justfile b/justfile
index 91d0271..fca8719 100644
--- a/justfile
+++ b/justfile
@@ -2,13 +2,13 @@
 just:
 	just --list --unsorted
 
-# Install dependencies and build via cask
+# Install dependencies and build via eask
 build:
 	emacs --version
-	cask install
-	cask build
+	eask install-deps --dev
+	eask package
 
 # Test
 test:
-	cask emacs --batch -L . -L test -f batch-byte-compile $(cask files)
-	cask emacs --batch -L . -L test -l test/all-tests.el -f ert-run-tests-batch-and-exit
+	eask compile
+	eask emacs --batch -L . -L test -l test/all-tests.el -f ert-run-tests-batch-and-exit