diff --git a/package-lock.json b/package-lock.json
index d530cdfb..7ee8ef70 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -796,6 +796,7 @@
       "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
       "dev": true,
+      "optional": true,
       "requires": {
         "kind-of": "^3.0.2",
         "longest": "^1.0.1",
@@ -4690,12 +4691,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -4710,17 +4713,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -4837,7 +4843,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -4849,6 +4856,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -4863,6 +4871,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -4870,12 +4879,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
@@ -4894,6 +4905,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -4974,7 +4986,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -4986,6 +4999,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -5107,6 +5121,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -7916,7 +7931,8 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/longest/-/longest-1.0.1.tgz",
       "integrity": "sha1-MKCy2jj3N3DoKUoNIuZiXtd9AJc=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "longest-streak": {
       "version": "2.0.2",
@@ -11182,14 +11198,15 @@
       }
     },
     "rollup-plugin-uglify": {
-      "version": "5.0.2",
-      "resolved": "https://registry.npmjs.org/rollup-plugin-uglify/-/rollup-plugin-uglify-5.0.2.tgz",
-      "integrity": "sha512-CRRyMgKjTwTx1GXnn+v1VYV+6De5NyPB1UBStsQIQ+asrxvP7dK43cg2pf1vyFNr/NIHGvfYAR9Yo4j+5ZMQsw==",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/rollup-plugin-uglify/-/rollup-plugin-uglify-6.0.0.tgz",
+      "integrity": "sha512-XtzZd159QuOaXNvcxyBcbUCSoBsv5YYWK+7ZwUyujSmISst8avRfjWlp7cGu8T2O52OJnpEBvl+D4WLV1k1iQQ==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
         "jest-worker": "^23.2.0",
-        "uglify-js": "^3.4.8"
+        "serialize-javascript": "^1.5.0",
+        "uglify-js": "^3.4.9"
       },
       "dependencies": {
         "@babel/code-frame": {
diff --git a/package.json b/package.json
index 15871439..09a36df8 100644
--- a/package.json
+++ b/package.json
@@ -66,7 +66,7 @@
     "rollup-plugin-node-resolve": "^3.3.0",
     "rollup-plugin-terser": "^2.0.2",
     "rollup-plugin-typescript2": "^0.17.0",
-    "rollup-plugin-uglify": "^5.0.2",
+    "rollup-plugin-uglify": "^6.0.0",
     "rollup": "^0.66.0",
     "ts-jest": "^23.0.1",
     "ts-loader": "^4.4.2",