diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
index b0bbd260..6d15c32c 100644
--- a/.github/workflows/node.js.yml
+++ b/.github/workflows/node.js.yml
@@ -19,7 +19,7 @@ jobs:
         node-version:
           - 12 # to be removed 2022-04-30
           - 14 # to be removed 2023-04-30
-          - 15 # to be removed 2021-06-01
+          - 16 # to be removed 2024-04-30
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
diff --git a/Makefile b/Makefile
deleted file mode 100644
index dfa5794c..00000000
--- a/Makefile
+++ /dev/null
@@ -1,117 +0,0 @@
-
-NODE_MAJOR_VERSION := $(firstword $(subst ., ,$(shell node --version)))
-
-ifeq ($(NODE_MAJOR_VERSION),v8)
-TESTS = test/*.js
-else ifeq ($(NODE_MAJOR_VERSION),v10)
-TESTS = test/*.js
-else ifeq ($(NODE_MAJOR_VERSION),v12)
-TESTS = test/*.js
-else
-TESTS = test/*.js test/*.mjs
-endif
-
-REPORTER = dot
-
-#
-# Browser Build
-#
-
-all: chai.js
-
-chai.js: node_modules lib/*
-	@printf "==> [Browser :: build]\n"
-	@./node_modules/.bin/browserify \
-	 	--bare \
-		--outfile chai.js \
-		--standalone chai \
-		--entry index.js
-
-#
-# Release Task
-#
-
-define release
-	./node_modules/.bin/bump -y --$(1) package.json lib/chai.js
-	make chai.js
-	git add --force chai.js lib/chai.js package.json bower.json
-	npm ls --depth=-1 --long . --loglevel silent | head -1 | git commit -F-
-endef
-
-release-patch:
-	@$(call release,patch)
-
-release-minor:
-	@$(call release,minor)
-
-release-major:
-	@$(call release,major)
-
-#
-# Node Module
-#
-
-node_modules: package.json
-	@npm install
-
-#
-# Tests
-#
-
-test: test-node test-chrome
-
-test-node: node_modules
-	@printf "==> [Test :: Node.js]\n"
-	@NODE_ENV=test ./node_modules/.bin/mocha \
-		--require ./test/bootstrap \
-		--reporter $(REPORTER) \
-		$(TESTS)
-
-test-cov: node_modules
-	@NODE_ENV=test ./node_modules/.bin/istanbul cover ./node_modules/.bin/_mocha -- \
-		--require ./test/bootstrap \
-		$(TESTS) \
-
-test-chrome: clean-browser chai.js
-	@printf "==> [Test :: Karma (chrome)]\n"
-	@./node_modules/karma/bin/karma start \
-		--single-run --browsers HeadlessChrome
-
-test-firefox: clean-browser chai.js
-	@printf "==> [Test :: Karma (Firefox)]\n"
-	@./node_modules/karma/bin/karma start \
-		--browsers Firefox
-
-test-sauce: clean-browser chai.js
-	@printf "==> [Test :: Karma (Sauce)]\n"
-	@CHAI_TEST_ENV=sauce ./node_modules/karma/bin/karma start \
-		--single-run
-
-test-travisci:
-	@echo TRAVIS_JOB_ID $(TRAVIS_JOB_ID)
-	@make test-cov
-	@make test-sauce
-
-#
-# Clean up
-#
-
-clean: clean-node clean-browser clean-cov
-
-clean-node:
-	@rm -rf node_modules
-
-clean-browser:
-	@rm -f chai.js
-
-clean-cov:
-	@rm -rf coverage
-
-#
-# Instructions
-#
-
-.PHONY: all
-.PHONY: test test-all test-node test-chrome test-sauce test-cov
-.PHONY: clean clean-node clean-browser clean-cov
-.PHONY: release-patch release-minor release-major
diff --git a/package.json b/package.json
index 9a68d88a..9d1fe6a7 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,15 @@
     "./": "./"
   },
   "scripts": {
-    "test": "make test"
+    "prebuild": "npm run clean",
+    "build": "browserify --bare --outfile chai.js --standalone chai --entry index.js",
+    "pretest": "npm run build",
+    "test": "npm run test-node && npm run test-chrome",
+    "test-node": "mocha --require ./test/bootstrap/index.js --reporter dot test/*.js test/*.mjs",
+    "test-chrome": "karma start karma.conf.js --single-run --browsers HeadlessChrome",
+    "test-firefox": "karma start karma.conf.js --browsers Firefox",
+    "test-cov": "istanbul cover ./node_modules/.bin/_mocha -- --require ./test/bootstrap/index.js test/*.js test/*.mjs",
+    "clean": "rm -f chai.js coverage"
   },
   "engines": {
     "node": ">=12"