diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index bd2f1ed0f31..e8d8a7977ef 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -5,7 +5,6 @@ Contributing to Leaflet
  2. [Reporting Bugs](#reporting-bugs)
  3. [Contributing Code](#contributing-code)
  4. [Running the Tests](#running-the-tests)
- 5. [Code Coverage](#code-coverage)
  6. [Improving Documentation](#improving-documentation)
  7. [Code of Conduct](#code-of-conduct)
  8. [Thank You](#thank-you)
@@ -137,17 +136,6 @@ npm test -- -- --browsers Firefox,Chrome,Safari,IE
 
 To run the tests in a browser manually, open `spec/index.html`.
 
-## Code Coverage
-
-To generate a detailed report about test coverage (which helps tremendously when working on test improvements), run:
-
-```
-npm test -- --cov
-```
-
-After that, open `coverage/<environment>/index.html` in a browser to see the report.
-From there you can click through folders/files to get details on their individual coverage.
-
 ## Improving Documentation
 
 The code of the live Leaflet website that contains all documentation and examples is located in the `docs/` directory of the `master` branch
diff --git a/bower.json b/bower.json
deleted file mode 100644
index 6b42495910d..00000000000
--- a/bower.json
+++ /dev/null
@@ -1,18 +0,0 @@
-{
-  "name": "leaflet",
-  "description": "JavaScript library for mobile-friendly interactive maps",
-  "license": "BSD-2-Clause",
-  "main": [
-    "dist/leaflet.css",
-    "dist/leaflet-src.js"
-  ],
-  "ignore": [
-    ".*",
-    "CHANGELOG.json",
-    "FAQ.md",
-    "debug",
-    "spec",
-    "src",
-    "build"
-  ]
-}
diff --git a/package.json b/package.json
index 6d6939a9020..32a88cc6ae1 100644
--- a/package.json
+++ b/package.json
@@ -3,32 +3,29 @@
   "version": "1.4.0",
   "description": "JavaScript library for mobile-friendly interactive maps",
   "devDependencies": {
-    "eslint": "^4.5.0",
+    "eslint": "^4.19.1",
     "eslint-config-mourner": "^2.0.1",
-    "git-rev-sync": "^1.8.0",
+    "git-rev-sync": "^1.12.0",
     "happen": "~0.3.2",
-    "karma": "^1.3.0",
-    "karma-chrome-launcher": "^2.0.0",
-    "karma-coverage": "~1.1.1",
+    "karma": "^4.1.0",
+    "karma-chrome-launcher": "^2.2.0",
     "karma-expect": "^1.1.3",
-    "karma-firefox-launcher": "^1.1.0",
-    "karma-mocha": "^1.2.0",
-    "karma-phantomjs-launcher": "^1.0.2",
-    "karma-rollup-preprocessor": "^5.0.1",
+    "karma-firefox-launcher": "~1.1.0",
+    "karma-mocha": "^1.3.0",
+    "karma-phantomjs-launcher": "^1.0.4",
+    "karma-rollup-preprocessor": "^7.0.0",
     "karma-safari-launcher": "~1.0.0",
     "karma-sinon": "^1.0.5",
     "leafdoc": "^1.4.1",
-    "mocha": "^3.1.0",
-    "phantomjs-prebuilt": "^2.1.12",
+    "mocha": "^6.1.4",
+    "phantomjs-prebuilt": "^2.1.16",
     "prosthetic-hand": "^1.3.1",
-    "rollup": "^0.51.8",
+    "rollup": "^1.11.0",
     "rollup-plugin-git-version": "0.2.1",
-    "rollup-plugin-json": "^2.1.0",
-    "rollup-watch": "^4.3.1",
-    "sinon": "^1.6.0",
-    "source-map": "^0.5.6",
-    "ssri": "^5.2.2",
-    "uglify-js": "~3.0.26"
+    "rollup-plugin-json": "^4.0.0",
+    "sinon": "^7.3.2",
+    "ssri": "^6.0.1",
+    "uglify-js": "~3.5.10"
   },
   "main": "dist/leaflet-src.js",
   "style": "dist/leaflet.css",
diff --git a/spec/karma.conf.js b/spec/karma.conf.js
index c74c211e2b9..60c1cf27a5f 100644
--- a/spec/karma.conf.js
+++ b/spec/karma.conf.js
@@ -27,10 +27,6 @@ module.exports = function (config) {
 
 	var preprocessors = {};
 
-	if (config.cov) {
-		preprocessors['src/**/*.js'] = ['coverage'];
-	}
-
 	preprocessors['src/Leaflet.js'] = ['rollup'];
 
 	config.set({
@@ -42,7 +38,6 @@ module.exports = function (config) {
 			'karma-mocha',
 			'karma-sinon',
 			'karma-expect',
-			'karma-coverage',
 			'karma-phantomjs-launcher',
 			'karma-chrome-launcher',
 			'karma-safari-launcher',
@@ -64,16 +59,16 @@ module.exports = function (config) {
 			plugins: [
 				json()
 			],
-			format: 'umd',
-			name: 'L',
-			outro: outro
+			output: {
+				format: 'umd',
+				name: 'L',
+				outro: outro
+			}
 		},
 
 		// test results reporter to use
 		// possible values: 'dots', 'progress', 'junit', 'growl', 'coverage'
-		reporters: config.cov ? ['dots', 'coverage'] : ['dots'],
-
-		coverageReporter: config.cov ? {type : 'html', dir : 'coverage/'} : null,
+		reporters: ['dots'],
 
 		// web server port
 		port: 9876,