diff --git a/test/fixtures/wpt/resources/webidl2/package-lock.json b/test/fixtures/wpt/resources/webidl2/package-lock.json
index b0581037fe9434..dda79106a3fad8 100644
--- a/test/fixtures/wpt/resources/webidl2/package-lock.json
+++ b/test/fixtures/wpt/resources/webidl2/package-lock.json
@@ -24,6 +24,12 @@
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@@ -104,6 +235,62 @@
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@@ -131,15 +318,114 @@
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 }
diff --git a/test/fixtures/wpt/resources/webidl2/package.json b/test/fixtures/wpt/resources/webidl2/package.json
index 92faccafa813fb..72b2e54828fce8 100644
--- a/test/fixtures/wpt/resources/webidl2/package.json
+++ b/test/fixtures/wpt/resources/webidl2/package.json
@@ -13,7 +13,7 @@
   "devDependencies": {
     "expect": "22.4.0",
     "jsondiffpatch": "0.3.5",
-    "mocha": "5.0.4"
+    "mocha": "6.0.0"
   },
   "scripts": {
     "test": "mocha",