diff --git a/.eslintrc b/.eslintrc
index bec601d..0625ffa 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,18 +1,6 @@
 env:
   node: true
 
-# enable ECMAScript features
-ecmaFeatures:
-  blockBindings: true
-  templateStrings: true
-  octalLiterals: true
-  binaryLiterals: true
-  generators: true
-  forOf: true
-  objectLiteralShorthandProperties: true
-  objectLiteralShorthandMethods: true
-  classes: true
-
 rules:
   # Possible Errors
   # list: https://github.com/eslint/eslint/tree/master/docs/rules#possible-errors
@@ -49,7 +37,7 @@ rules:
   ## require spaces operator like var sum = 1 + 1;
   space-infix-ops: 2
   ## require spaces return, throw, case
-  space-return-throw-case: 2
+  keyword-spacing: 2
   ## no space before function, eg. 'function()'
   space-before-function-paren: [2, "never"]
   ## require space before blocks, eg 'function() {}'
@@ -64,8 +52,6 @@ rules:
   eol-last: 2
   ## no trailing spaces
   no-trailing-spaces: 2
-  # require space after keywords, eg 'for (..)'
-  space-after-keywords: 2
 
   # Strict Mode
   # list: https://github.com/eslint/eslint/tree/master/docs/rules#strict-mode
diff --git a/.travis.yml b/.travis.yml
index 94f876e..abc8c02 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,5 @@
 language: "node_js"
 node_js:
-  - "0.10"
-  - "0.12"
-  - "iojs"
-  - "4.0"
+  - node
+  - lts/*
 script: npm run lint && npm run coveralls
diff --git a/lib/merge.js b/lib/merge.js
index ba6aeb2..cb60939 100644
--- a/lib/merge.js
+++ b/lib/merge.js
@@ -9,12 +9,12 @@ module.exports = function merge(patch1, patch2) {
   var patch = JSON.parse(JSON.stringify(patch1));
 
   Object.keys(patch2)
-  .forEach(function(key) {
-    if (patch1[key] !== undefined) {
-      patch[key] = merge(patch1[key], patch2[key]);
-    } else {
-      patch[key] = patch2[key];
-    }
-  });
+    .forEach(function(key) {
+      if (patch1[key] !== undefined) {
+        patch[key] = merge(patch1[key], patch2[key]);
+      } else {
+        patch[key] = patch2[key];
+      }
+    });
   return patch;
 };
diff --git a/package.json b/package.json
index c34518c..6b404e3 100644
--- a/package.json
+++ b/package.json
@@ -7,17 +7,17 @@
     "test": "test"
   },
   "devDependencies": {
-    "chai": "^3.2.0",
-    "coveralls": "^2.11.2",
-    "eslint": "^1.4.3",
-    "istanbul": "^0.3.11",
-    "mocha": "^2.3.2"
+    "chai": "^4.2.0",
+    "coveralls": "^3.1.0",
+    "eslint": "^7.0.0",
+    "istanbul": "^0.4.5",
+    "mocha": "^7.1.2"
   },
   "scripts": {
     "test": "NODE_ENV=test mocha -b --reporter spec --recursive test",
     "lint": "eslint ./lib ./index.js",
     "coverage": "istanbul cover _mocha -- -R spec --recursive test",
-    "coveralls": "istanbul cover _mocha -- -R spec --recursive test; cat ./coverage/lcov.info | coveralls.js || true"
+    "coveralls": "istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec  --recursive test && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage"
   },
   "repository": {
     "type": "git",
@@ -37,6 +37,6 @@
   },
   "homepage": "https://github.com/pierreinglebert/json-merge-patch",
   "dependencies": {
-    "deep-equal": "^1.0.0"
+    "deep-equal": "^2.0.3"
   }
 }