diff --git a/package.json b/package.json
index b8ce3b8..84aa156 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "installed-check": "2.1.3",
     "mocha": "5.2.0",
     "nodemon": "1.17.5",
-    "nyc": "^12.0.2",
+    "nyc": "12.0.2",
     "pegjs": "0.9.0"
   }
 }