diff --git a/package.json b/package.json
index c2270a6..05fc25b 100644
--- a/package.json
+++ b/package.json
@@ -33,10 +33,10 @@
   },
   "devDependencies": {
     "ansi": "^0.3.0",
-    "autoprefixer-stylus": "^0.11.0",
+    "autoprefixer-stylus": "^0.14.0",
     "benchmark": "~2.1.0",
-    "browserify": "*",
-    "chai": "^3.4.1",
+    "browserify": "^16.3.0",
+    "chai": "^4.2.0",
     "coveralls": "^3.0.4",
     "eslint": "^3.5.0",
     "express": "^4.14.0",
@@ -47,17 +47,17 @@
     "markdown-it-deflist": "^2.0.0",
     "markdown-it-emoji": "^1.1.1",
     "markdown-it-footnote": "^3.0.1",
-    "markdown-it-for-inline": "~0.1.0",
+    "markdown-it-for-inline": "^0.1.0",
     "markdown-it-ins": "^2.0.0",
     "markdown-it-mark": "^2.0.0",
     "markdown-it-sub": "^1.0.0",
     "markdown-it-sup": "^1.0.0",
-    "markdown-it-testgen": "~0.1.3",
-    "mocha": "^5.2.0",
+    "markdown-it-testgen": "^0.1.3",
+    "mocha": "^6.1.4",
     "ndoc": "^5.0.0",
     "pug-cli": "^1.0.0-alpha6",
-    "stylus": "~0.54.2",
-    "supertest": "^3.0.0",
-    "terser": "^3.16.1"
+    "stylus": "^0.54.5",
+    "supertest": "^4.0.2",
+    "terser": "^4.1.2"
   }
 }