diff --git a/package.json b/package.json
index a416cfb..9145e1b 100644
--- a/package.json
+++ b/package.json
@@ -19,11 +19,11 @@
     "ytdl-core": "0.29.1"
   },
   "devDependencies": {
-    "assert": "^1.4.1",
-    "chai": "^4.2.0",
-    "mocha": "^5.2.0",
-    "nyc": "^13.1.0",
-    "rewire": "^4.0.1",
-    "sinon": "^7.2.3"
+    "assert": "1.4.1",
+    "chai": "4.2.0",
+    "mocha": "5.2.0",
+    "nyc": "13.2.0",
+    "rewire": "4.0.1",
+    "sinon": "7.2.3"
   }
 }