diff --git a/package-lock.json b/package-lock.json
index 655f114..1e89f4b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,339 @@
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@@ -412,6 +892,15 @@
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@@ -448,11 +937,35 @@
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@@ -546,6 +1059,27 @@
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@@ -559,6 +1093,16 @@
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@@ -675,6 +1228,7 @@
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@@ -682,6 +1236,7 @@
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@@ -689,7 +1244,8 @@
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@@ -761,7 +1323,8 @@
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@@ -873,7 +1440,8 @@
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@@ -928,8 +1499,9 @@
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@@ -938,6 +1510,7 @@
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@@ -949,7 +1522,8 @@
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@@ -1024,20 +1600,16 @@
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@@ -1084,7 +1656,8 @@
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@@ -1099,6 +1672,7 @@
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@@ -1124,7 +1698,8 @@
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@@ -1133,7 +1708,8 @@
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@@ -4779,6 +3324,12 @@
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@@ -4788,12 +3339,56 @@
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+      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.0.10.tgz",
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@@ -4907,10 +3527,130 @@
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 }
diff --git a/package.json b/package.json
index ad95cd6..f3384ad 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "mocha": "^5.2.0",
     "mock-fs": "^4.5.0",
     "npm-auto-version": "^1.0.0",
-    "nyc": "^11.9.0",
+    "nyc": "^15.1.0",
     "sinon": "^4.5.0",
     "tslint": "^5.10.0",
     "tslint-microsoft-contrib": "^5.0.3",