diff --git a/package-lock.json b/package-lock.json
index 14dd7727..1e5e2a83 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2060,12 +2060,14 @@
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       "version": "0.3.8",
       "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.8.tgz",
-      "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg=="
+      "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg==",
+      "dev": true
     },
     "cssstyle": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-1.4.0.tgz",
       "integrity": "sha512-GBrLZYZ4X4x6/QEoBnIrqb8B/f5l4+8me2dkom/j1Gtbxy0kBv6OGzKuAsGM75bkGwGAFkt56Iwg28S3XTZgSA==",
+      "dev": true,
       "requires": {
         "cssom": "0.3.x"
       }
@@ -4248,16 +4250,16 @@
       }
     },
     "jsdom": {
-      "version": "15.1.1",
-      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-15.1.1.tgz",
-      "integrity": "sha512-cQZRBB33arrDAeCrAEWn1U3SvrvC8XysBua9Oqg1yWrsY/gYcusloJC3RZJXuY5eehSCmws8f2YeliCqGSkrtQ==",
+      "version": "15.2.0",
+      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-15.2.0.tgz",
+      "integrity": "sha512-+hRyEfjRPFwTYMmSQ3/f7U9nP8ZNZmbkmUek760ZpxnCPWJIhaaLRuUSvpJ36fZKCGENxLwxClzwpOpnXNfChQ==",
       "requires": {
         "abab": "^2.0.0",
-        "acorn": "^6.1.1",
+        "acorn": "^7.1.0",
         "acorn-globals": "^4.3.2",
         "array-equal": "^1.0.0",
-        "cssom": "^0.3.6",
-        "cssstyle": "^1.2.2",
+        "cssom": "^0.4.1",
+        "cssstyle": "^2.0.0",
         "data-urls": "^1.1.0",
         "domexception": "^1.0.1",
         "escodegen": "^1.11.1",
@@ -4281,9 +4283,29 @@
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       "dependencies": {
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-          "version": "6.3.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.3.0.tgz",
-          "integrity": "sha512-/czfa8BwS88b9gWQVhc8eknunSA2DoJpJyTQkhheIf5E48u1N0R4q/YxxsAeqRrmK9TQ/uYfgLDfZo91UlANIA=="
+          "version": "7.1.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
+          "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ=="
+        },
+        "cssom": {
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.4.1.tgz",
+          "integrity": "sha512-6Aajq0XmukE7HdXUU6IoSWuH1H6gH9z6qmagsstTiN7cW2FNTsb+J2Chs+ufPgZCsV/yo8oaEudQLrb9dGxSVQ=="
+        },
+        "cssstyle": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-2.0.0.tgz",
+          "integrity": "sha512-QXSAu2WBsSRXCPjvI43Y40m6fMevvyRm8JVAuF9ksQz5jha4pWP1wpaK7Yu5oLFc6+XAY+hj8YhefyXcBB53gg==",
+          "requires": {
+            "cssom": "~0.3.6"
+          },
+          "dependencies": {
+            "cssom": {
+              "version": "0.3.8",
+              "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.8.tgz",
+              "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg=="
+            }
+          }
         }
       }
     },
@@ -8849,9 +8871,9 @@
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     "ws": {
-      "version": "7.1.2",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.1.2.tgz",
-      "integrity": "sha512-gftXq3XI81cJCgkUiAVixA0raD9IVmXqsylCrjRygw4+UOOGzPoxnQ6r/CnVL9i+mDncJo94tSkyrtuuQVBmrg==",
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.0.tgz",
+      "integrity": "sha512-+SqNqFbwTm/0DC18KYzIsMTnEWpLwJsiasW/O17la4iDRRIO9uaHbvKiAS3AHgTiuuWerK/brj4O6MYZkei9xg==",
       "requires": {
         "async-limiter": "^1.0.0"
       }
diff --git a/package.json b/package.json
index 6f60a112..e0accbad 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
     "eslint": "^4.19.1",
     "gh-pages": "^2.1.1",
     "jsdoc": "^3.6.3",
-    "jsdom": "^15.1.1",
+    "jsdom": "^15.2.0",
     "minami": "^1.2.3",
     "mocha": "^6.2.1",
     "rollup": "^1.23.1",