diff --git a/package-lock.json b/package-lock.json
index 750a190..3fd0641 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -3491,6 +3474,33 @@
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@@ -3561,12 +3565,27 @@
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@@ -3623,12 +3642,88 @@
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@@ -3644,17 +3739,147 @@
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   }
 }
diff --git a/package.json b/package.json
index ee2c2f6..72d7b61 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "chai": "^4.0.1",
     "coveralls": "^2.11.16",
     "mocha": "^5.0.0",
-    "nyc": "^13.2.0",
+    "nyc": "^15.1.0",
     "snazzy": "^7.0.0",
     "standard": "^11.0.0"
   },