diff --git a/package-lock.json b/package-lock.json
index 3c2945f..e1b15c8 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -11161,41 +10217,6 @@
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-      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
-      "integrity": "sha1-XHHDTLW61dzr4+oM0IIHulqhrqQ=",
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-          "dev": true,
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-          "integrity": "sha1-fbCPnT0i3H945Trzw79GZuzfzPE=",
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@@ -11216,52 +10237,6 @@
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-          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
-          "dev": true
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@@ -11294,12 +10269,6 @@
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-      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
-      "dev": true
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@@ -11309,23 +10278,6 @@
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diff --git a/package.json b/package.json
index 5587288..38459b3 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "@commitlint/config-conventional": "7.1.2",
     "ava": "0.25.0",
     "babel-cli": "6.26.0",
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+    "babel-plugin-istanbul": "5.1.0",
     "babel-preset-env": "1.7.0",
     "babel-register": "6.26.0",
     "eslint": "5.10.0",