diff --git a/package-lock.json b/package-lock.json
index 4bda61b..1757838 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,7 +29,7 @@
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@@ -134,6 +135,15 @@
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@@ -1582,6 +1586,12 @@
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@@ -2286,6 +2299,20 @@
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@@ -2304,6 +2331,12 @@
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@@ -2774,13 +2828,13 @@
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@@ -2789,12 +2843,21 @@
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@@ -4603,6 +4669,12 @@
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@@ -4877,6 +4967,21 @@
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@@ -9700,6 +9805,39 @@
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@@ -19479,6 +19776,26 @@
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@@ -20517,6 +20846,12 @@
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@@ -20693,6 +21028,24 @@
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@@ -20721,9 +21074,9 @@
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+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
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@@ -20964,10 +21316,23 @@
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diff --git a/package.json b/package.json
index 48bd978..ff2ffb0 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
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+    "jsdom": "^16.5.0",
     "mocha": "^2.5.3",
     "nyc": "^6.6.1",
     "power-assert": "^1.4.1",