diff --git a/package.json b/package.json
index 97a3939..50abe2c 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
   },
   "homepage": "http://github.com/dex4er/js-null-writable",
   "engines": {
-    "node": ">=6.0.0"
+    "node": ">=v6.17.1"
   },
   "dependencies": {},
   "devDependencies": {
@@ -38,16 +38,16 @@
     "eslint-plugin-import": "^2.18.2",
     "eslint-plugin-node": "^10.0.0",
     "eslint-plugin-promise": "^4.2.1",
-    "markdownlint-cli": "^0.18.0",
+    "markdownlint-cli": "^0.29.0",
     "mocha": "^6.2.1",
     "mocha-steps": "^1.3.0",
     "nyc": "^14.1.1",
-    "prettier": "^1.18.2",
-    "shx": "^0.3.2",
-    "ts-node": "^8.4.1",
+    "prettier": "^1.19.1",
+    "shx": "^0.3.3",
+    "ts-node": "^8.10.2",
     "tslint": "^5.20.0",
     "tslint-config-prettier": "^1.18.0",
-    "typescript": "^3.6.3"
+    "typescript": "^3.9.10"
   },
   "scripts": {
     "compile": "tsc --pretty --project .",