diff --git a/tests/package.json b/tests/package.json
index 46b018a..7ecfdcd 100644
--- a/tests/package.json
+++ b/tests/package.json
@@ -3,7 +3,7 @@
   "dependencies": {
     "chai": "^4.2.0",
     "codecov": "^3.3.0",
-    "mocha": "^6.0.2",
+    "mocha": "6.0.2",
     "nyc": "^13.3.0",
     "rewire": "^4.0.1"
   }