diff --git a/.travis.yml b/.travis.yml
index d99a0ba..4796715 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,3 @@
 language: node_js
 node_js:
-  - "8"
   - "node"
\ No newline at end of file
diff --git a/README.md b/README.md
index 03a98f6..6ab1891 100644
--- a/README.md
+++ b/README.md
@@ -155,4 +155,7 @@ $ npm install && npm test
 
 ### License
 Copyright © 2018, [kmdrGroch](https://github.com/kmdrgroch).
-Released under the [MIT License](LICENSE).
\ No newline at end of file
+Released under the [MIT License](LICENSE).
+
+### Note
+The code will work for node >= 8, although there is a possibility that development tools won't work for some versions.
\ No newline at end of file
diff --git a/package.json b/package.json
index 4b88b10..532545f 100644
--- a/package.json
+++ b/package.json
@@ -11,20 +11,20 @@
     "test": "npm run build && nyc --include src/**/*.js --reporter=html --report-dir=coverage --check-coverage mocha \" src/**/*.spec.js\""
   },
   "devDependencies": {
-    "@types/benchmark": "^1.0.31",
-    "@types/chai": "^4.1.7",
-    "@types/mocha": "^5.2.6",
-    "@types/node": "^11.9.3",
-    "benchmark": "^2.1.4",
-    "chai": "^4.2.0",
-    "mocha": "^6.0.0",
-    "nyc": "^14.0.0",
-    "rimraf": "^2.6.3",
-    "tslint": "^5.12.1",
-    "typescript": "^3.3.3"
+    "@types/benchmark": "1.0.33",
+    "@types/chai": "4.2.12",
+    "@types/mocha": "8.0.1",
+    "@types/node": "14.0.27",
+    "benchmark": "2.1.4",
+    "chai": "4.2.0",
+    "mocha": "8.1.1",
+    "nyc": "15.1.0",
+    "rimraf": "3.0.2",
+    "tslint": "6.1.3",
+    "typescript": "3.9.7"
   },
   "dependencies": {
-    "param-type": "^1.1.0"
+    "param-type": "^1.1.1"
   },
   "author": "kmdrGroch",
   "license": "MIT"
diff --git a/src/paramsEqual.js b/src/paramsEqual.js
index 6993636..3164605 100644
--- a/src/paramsEqual.js
+++ b/src/paramsEqual.js
@@ -29,7 +29,7 @@ const paramsEqual = (a, b) => {
     if (a.length !== b.length) {
         return false;
     }
-    for (const k in a) {
+    for (const k of Object.keys(a)) {
         const propsA = Object.getOwnPropertyDescriptor(a, k) || {};
         const propsB = Object.getOwnPropertyDescriptor(b, k) || {};
         if (a[k] === a) {
diff --git a/src/paramsEqual.js.map b/src/paramsEqual.js.map
index 03ed395..d6c52ab 100644
--- a/src/paramsEqual.js.map
+++ b/src/paramsEqual.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"paramsEqual.js","sourceRoot":"","sources":["paramsEqual.ts"],"names":[],"mappings":";;AAAA,2CAAmC;AAEnC,MAAM,QAAQ,GAAiB,MAAM,CAAC,QAAQ,CAAC;AAE/C;;;GAGG;AACH,MAAM,WAAW,GAAG,CAAC,CAAM,EAAE,CAAM,EAAW,EAAE;IAC9C,0BAA0B;IAC1B,IAAI,oBAAS,CAAC,CAAC,CAAC,KAAK,oBAAS,CAAC,CAAC,CAAC,EAAE;QACjC,OAAO,KAAK,CAAC;KACd;IACD,4CAA4C;IAC5C,IAAI,OAAO,CAAC,KAAK,QAAQ,EAAE;QACzB,OAAO,MAAM,CAAC,EAAE,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC;KACxB;IACD,IAAI,CAAC,SAAS,EAAE,QAAQ,EAAE,MAAM,EAAE,QAAQ,EAAE,QAAQ,CAAC,CAAC,OAAO,CAAC,oBAAS,CAAC,CAAC,CAAC,CAAC,GAAG,CAAC,CAAC,EAAE;QAChF,OAAO,MAAM,CAAC,CAAC,CAAC,KAAK,MAAM,CAAC,CAAC,CAAC,CAAC;KAChC;IACD,qBAAqB;IACrB,IAAI,OAAO,CAAC,KAAK,UAAU,EAAE;QAC3B,OAAO,QAAQ,CAAC,IAAI,CAAC,CAAC,CAAC,KAAK,QAAQ,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;KAC9C;IACD,mBAAmB;IACnB,IAAI,CAAC,KAAK,CAAC,EAAE;QACX,OAAO,IAAI,CAAC;KACb;IACD,IAAI,CAAC,CAAC,MAAM,KAAK,CAAC,CAAC,MAAM,EAAE;QACzB,OAAO,KAAK,CAAC;KACd;IACD,KAAK,MAAM,CAAC,IAAI,MAAM,CAAC,IAAI,CAAC,CAAC,CAAC,EAAE;QAC9B,MAAM,MAAM,GAAG,MAAM,CAAC,wBAAwB,CAAC,CAAC,EAAE,CAAC,CAAC,IAAI,EAAE,CAAC;QAC3D,MAAM,MAAM,GAAG,MAAM,CAAC,wBAAwB,CAAC,CAAC,EAAE,CAAC,CAAC,IAAI,EAAE,CAAC;QAE3D,IAAI,CAAC,CAAC,CAAC,CAAC,KAAK,CAAC,EAAE;YACd,MAAM,IAAI,UAAU,CAAC,6CAA6C,CAAC,CAAC;SACrE;QAED,IAAI,CAAC,WAAW,CAAC,MAAM,CAAC,GAAG,EAAE,MAAM,CAAC,GAAG,CAAC,IAAI,CAAC,WAAW,CAAC,MAAM,CAAC,GAAG,EAAE,MAAM,CAAC,GAAG,CAAC,EAAE;YAChF,OAAO,KAAK,CAAC;SACd;QACD,IAAI,CAAC,CAAC,CAAC,cAAc,CAAC,CAAC,CAAC,IAAI,CAAC,WAAW,CAAC,CAAC,CAAC,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,CAAC,CAAC,EAAE;YACpD,OAAO,KAAK,CAAC;SACd;QACD,OAAO,CAAC,CAAC,CAAC,CAAC,CAAC;QACZ,OAAO,CAAC,CAAC,CAAC,CAAC,CAAC;KACb;IAED,OAAO,MAAM,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC,MAAM,KAAK,CAAC,CAAC;AACrC,CAAC,CAAC;AAEF,kBAAe,WAAW,CAAC"}
\ No newline at end of file
diff --git a/src/paramsEqual.ts b/src/paramsEqual.ts
index 3aad586..4438fa2 100644
--- a/src/paramsEqual.ts
+++ b/src/paramsEqual.ts
@@ -29,7 +29,7 @@ const paramsEqual = (a: any, b: any): boolean => {
   if (a.length !== b.length) {
     return false;
   }
-  for (const k in a) {
+  for (const k of Object.keys(a)) {
     const propsA = Object.getOwnPropertyDescriptor(a, k) || {};
     const propsB = Object.getOwnPropertyDescriptor(b, k) || {};