diff --git a/.ert-runner b/.ert-runner
deleted file mode 100644
index ec92c4a1..00000000
--- a/.ert-runner
+++ /dev/null
@@ -1,2 +0,0 @@
--L .
---quiet
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 00000000..810d6083
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,41 @@
+name: CI
+
+on:
+  push:
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+
+jobs:
+  test:
+    name: mix test (Emacs ${{matrix.emacs_version}} | Elixir ${{matrix.elixir}} | Erlang/OTP ${{matrix.otp}})
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        emacs_version: ['27.1', '26.3', '25.2']
+        otp: ['21.3', '23.2']
+        elixir: ['1.8.2', '1.11.4']
+
+    steps:
+      - name: Setup Emacs
+        uses: purcell/setup-emacs@master
+        with:
+          version: ${{matrix.emacs_version}}
+
+      - name: Setup OTP + Elixir
+        uses: erlef/setup-elixir@v1
+        with:
+          otp-version: ${{matrix.otp}}
+          elixir-version: ${{matrix.elixir}}
+
+      - name: Install Eldev
+        run: curl -fsSL https://raw.github.com/doublep/eldev/master/webinstall/github-eldev | sh
+
+      - name: Check out the source code
+        uses: actions/checkout@v2
+  
+      - name: Test the project
+        run: |
+          eldev -p -dtT test
diff --git a/.gitignore b/.gitignore
index 8b647d60..79b089ee 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,9 @@
 /.cask/
 /dist/
 *-emacs-elixir-format.ex
+elixir-mode-autoloads.el
+
+# Added automatically by ‘eldev init’.
+/.eldev
+/Eldev-local
+
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 43777fc5..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-language: elixir
-cache: apt
-env:
-  - EVM_EMACS=24.3
-  - EVM_EMACS=24.4
-  - EVM_EMACS=24.5
-  - EVM_EMACS=25.1
-  - EVM_EMACS=25.2
-matrix:
-  include:
-    - elixir: 1.0.5
-      otp_release: 17.4
-    - elixir: 1.4.3
-      otp_release: 19.0
-    - elixir: 1.6.0
-      otp_release: 20.1
-before_install:
-  - curl -fsSkL https://gist.githubusercontent.com/Trevoke/90409590f43abfd0d7fe3b02b5249849/raw > travis.sh && source ./travis.sh
-  - evm install emacs-$EVM_EMACS-travis --use --skip
-  - cask
-install:
-  - cask install
-script:
-  - cask exec ert-runner
diff --git a/Cask b/Cask
deleted file mode 100644
index 0015757c..00000000
--- a/Cask
+++ /dev/null
@@ -1,9 +0,0 @@
-(source gnu)
-(source melpa)
-
-(package-file "elixir-mode.el")
-
-(files "*.el")
-
-(development
- (depends-on "ert-runner"))
diff --git a/Eldev b/Eldev
new file mode 100644
index 00000000..0e7f75aa
--- /dev/null
+++ b/Eldev
@@ -0,0 +1,11 @@
+; -*- mode: emacs-lisp; lexical-binding: t; no-byte-compile: t -*-
+
+;; Autodetermined by `eldev init'.
+(eldev-use-package-archive 'melpa)
+
+(eldev-use-plugin 'autoloads)
+(eldev-use-plugin 'undercover)
+
+(eldev-add-loading-roots 'test "tests")
+
+(eldev-add-extra-dependencies 'test 's)
diff --git a/elixir-mode.el b/elixir-mode.el
index 0d5f32f4..06dc1fde 100644
--- a/elixir-mode.el
+++ b/elixir-mode.el
@@ -11,7 +11,7 @@
 ;; Created: Mon Nov 7 2011
 ;; Keywords: languages elixir
 ;; Version: 2.4.0
-;; Package-Requires: ((emacs "24") (pkg-info "0.4"))
+;; Package-Requires: ((emacs "25") (pkg-info "0.6"))
 
 ;; This file is not a part of GNU Emacs.
 
diff --git a/test/elixir-format-test.el b/tests/elixir-format-test.el
similarity index 98%
rename from test/elixir-format-test.el
rename to tests/elixir-format-test.el
index 70645272..49b1a4a1 100644
--- a/test/elixir-format-test.el
+++ b/tests/elixir-format-test.el
@@ -1,6 +1,7 @@
 ;;; elixir-format-test.el --- Basic tests for elixir-format
 
 ;;; Code:
+(require 'test-helper)
 
 (ert-deftest elixir-format-indents-a-buffer ()
   (when elixir-formatter-supported
diff --git a/test/elixir-mode-font-test.el b/tests/elixir-mode-font-test.el
similarity index 99%
rename from test/elixir-mode-font-test.el
rename to tests/elixir-mode-font-test.el
index 1137a69b..1ca470e8 100644
--- a/test/elixir-mode-font-test.el
+++ b/tests/elixir-mode-font-test.el
@@ -7,6 +7,7 @@
 ;; https://github.com/lunaryorn/puppet-mode/blob/master/test/puppet-mode-test.el
 
 ;;; Code:
+(require 'test-helper)
 
 (defun elixir-test-face-at (pos &optional content)
   "Get the face at POS in CONTENT.
diff --git a/test/elixir-mode-helper-test.el b/tests/elixir-mode-helper-test.el
similarity index 99%
rename from test/elixir-mode-helper-test.el
rename to tests/elixir-mode-helper-test.el
index 01959472..8dfd7249 100644
--- a/test/elixir-mode-helper-test.el
+++ b/tests/elixir-mode-helper-test.el
@@ -1,6 +1,7 @@
 ;;; elixir-mode-helper-test.el --- Tests for helper functions
 
 ;;; Code:
+(require 'test-helper)
 
 (ert-deftest check-if-currently-inside-heredoc ()
   (should (with-temp-buffer
diff --git a/test/elixir-mode-indentation-test.el b/tests/elixir-mode-indentation-test.el
similarity index 99%
rename from test/elixir-mode-indentation-test.el
rename to tests/elixir-mode-indentation-test.el
index 05d1751a..1a1c2aa3 100644
--- a/test/elixir-mode-indentation-test.el
+++ b/tests/elixir-mode-indentation-test.el
@@ -8,6 +8,7 @@
 ;; passes.
 
 ;;; Code:
+(require 'test-helper)
 
 (elixir-def-indentation-test indent-use-dot-module-newline
                              (:tags '(indentation))
diff --git a/test/elixir-mode-moving-test.el b/tests/elixir-mode-moving-test.el
similarity index 98%
rename from test/elixir-mode-moving-test.el
rename to tests/elixir-mode-moving-test.el
index 42213e5c..0e2efddf 100644
--- a/test/elixir-mode-moving-test.el
+++ b/tests/elixir-mode-moving-test.el
@@ -1,6 +1,7 @@
 ;;; elixir-mode-moving-test.el --- Tests for moving cursor functions
 
 ;;; Code:
+(require 'test-helper)
 
 (ert-deftest beginning-of-defun ()
   :tags '(moving)
diff --git a/test/test-helper.el b/tests/test-helper.el
similarity index 94%
rename from test/test-helper.el
rename to tests/test-helper.el
index d108e721..6af0d0a9 100644
--- a/test/test-helper.el
+++ b/tests/test-helper.el
@@ -7,6 +7,7 @@
 
 (require 'ert-x)          ; `ert-with-test-buffer'
 (require 'cl-lib)         ; `cl-defmacro'
+(require 's)
 
 (message "Running tests on Emacs %s" emacs-version)
 
@@ -62,10 +63,6 @@
            (insert indented)
            (should (equal indented ,expected-output)))))))
 
-(when (s-contains? "--win" (getenv "ERT_RUNNER_ARGS"))
-  (defun ert-runner/run-tests-batch-and-exit (selector)
-    (ert-run-tests-interactively selector)))
-
 (setq elixir-format-elixir-path (executable-find "elixir"))
 (setq elixir-format-mix-path (executable-find "mix"))
 
@@ -100,4 +97,5 @@ end")
 end
 ")
 
+(provide 'test-helper)
 ;;; test-helper.el ends here