diff --git a/package-lock.json b/package-lock.json
index e52f34e..f91c4ec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1494,7 +1494,8 @@
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-              "dev": true
+              "dev": true,
+              "optional": true
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@@ -1515,12 +1516,14 @@
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               "version": "1.0.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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               "version": "1.1.11",
               "bundled": true,
               "dev": true,
+              "optional": true,
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@@ -1535,17 +1538,20 @@
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               "version": "1.1.0",
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-              "dev": true
+              "dev": true,
+              "optional": true
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               "version": "0.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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-              "dev": true
+              "dev": true,
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@@ -1662,7 +1668,8 @@
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               "version": "2.0.3",
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-              "dev": true
+              "dev": true,
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@@ -1674,6 +1681,7 @@
               "version": "1.0.0",
               "bundled": true,
               "dev": true,
+              "optional": true,
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               }
@@ -1688,6 +1696,7 @@
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               "bundled": true,
               "dev": true,
+              "optional": true,
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@@ -1695,12 +1704,14 @@
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               "version": "0.0.8",
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+              "dev": true,
+              "optional": true
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               "version": "2.3.5",
               "bundled": true,
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+              "optional": true,
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@@ -1719,6 +1730,7 @@
               "version": "0.5.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
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@@ -1799,7 +1811,8 @@
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               "version": "1.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
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@@ -1811,6 +1824,7 @@
               "version": "1.4.0",
               "bundled": true,
               "dev": true,
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@@ -1896,7 +1910,8 @@
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               "version": "5.1.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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               "version": "2.1.2",
@@ -1932,6 +1947,7 @@
               "version": "1.0.2",
               "bundled": true,
               "dev": true,
+              "optional": true,
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                 "is-fullwidth-code-point": "^1.0.0",
@@ -1951,6 +1967,7 @@
               "version": "3.0.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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@@ -1994,12 +2011,14 @@
             "wrappy": {
               "version": "1.0.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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               "version": "3.0.3",
               "bundled": true,
-              "dev": true
+              "dev": true,
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@@ -2577,11 +2596,6 @@
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-      "integrity": "sha1-AQ1YWEI6XxGJeWZfRkhqlcbuK7Y="
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@@ -2768,7 +2782,8 @@
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           "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-          "dev": true
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@@ -2792,13 +2807,15 @@
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           "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-          "dev": true
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           "dev": true,
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@@ -2815,19 +2832,22 @@
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-          "dev": true
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           "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-          "dev": true
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           "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -2958,7 +2978,8 @@
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           "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -2972,6 +2993,7 @@
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           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
+          "optional": true,
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@@ -2988,6 +3010,7 @@
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           "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
           "dev": true,
+          "optional": true,
           "requires": {
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           }
@@ -2996,13 +3019,15 @@
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           "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
-          "dev": true
+          "dev": true,
+          "optional": true
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         "minipass": {
           "version": "2.2.4",
           "resolved": "https://registry.npmjs.org/minipass/-/minipass-2.2.4.tgz",
           "integrity": "sha512-hzXIWWet/BzWhYs2b+u7dRHlruXhwdgvlTMDKC6Cb1U7ps6Ac6yQlR39xsbjWJE377YTCtKwIXIpJ5oP+j5y8g==",
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+          "optional": true,
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@@ -3023,6 +3048,7 @@
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           "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
           "dev": true,
+          "optional": true,
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@@ -3111,7 +3137,8 @@
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           "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3125,6 +3152,7 @@
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           "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -3220,7 +3248,8 @@
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-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3262,6 +3291,7 @@
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           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
+          "optional": true,
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@@ -3283,6 +3313,7 @@
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           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
+          "optional": true,
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@@ -3331,13 +3362,15 @@
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           "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-          "dev": true
+          "dev": true,
+          "optional": true
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         "yallist": {
           "version": "3.0.2",
           "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.2.tgz",
           "integrity": "sha1-hFK0u36Dx8GI2AQcGoN8dz1ti7k=",
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3589,7 +3622,7 @@
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       "resolved": "https://registry.npmjs.org/immediate/-/immediate-3.0.6.tgz",
-      "integrity": "sha1-nbHb0Pr43m++D13V5Wu2BigN5ps="
+      "integrity": "sha512-XXOFtyqDjNDAQxVfYxuF7g9Il/IbWmmlQg2MYKOH8ExIT1qg6xc4zyS3HaEEATgs1btfzxq15ciUiY7gjSXRGQ=="
     },
     "inflight": {
       "version": "1.0.6",
@@ -3897,39 +3930,42 @@
       "dev": true
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-      "version": "3.1.5",
-      "resolved": "https://registry.npmjs.org/jszip/-/jszip-3.1.5.tgz",
-      "integrity": "sha1-48KmxtcGrG5gMxQDbUPNQL7v3zc=",
+      "version": "3.7.0",
+      "resolved": "https://registry.npmjs.org/jszip/-/jszip-3.7.0.tgz",
+      "integrity": "sha512-Y2OlFIzrDOPWUnpU0LORIcDn2xN7rC9yKffFM/7pGhQuhO+SUhfm2trkJ/S5amjFvem0Y+1EALz/MEPkvHXVNw==",
       "requires": {
-        "core-js": "~2.3.0",
-        "es6-promise": "~3.0.2",
-        "lie": "~3.1.0",
+        "lie": "~3.3.0",
         "pako": "~1.0.2",
-        "readable-stream": "~2.0.6"
+        "readable-stream": "~2.3.6",
+        "set-immediate-shim": "~1.0.1"
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-        "core-js": {
-          "version": "2.3.0",
-          "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.3.0.tgz",
-          "integrity": "sha1-+rg/uwstjchfpjbEudNMdUIMbWU="
-        },
-        "pako": {
-          "version": "1.0.6",
-          "resolved": "https://registry.npmjs.org/pako/-/pako-1.0.6.tgz",
-          "integrity": "sha1-AQEhG6pwxLykoPY/Igbpe3368lg="
+        "process-nextick-args": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+          "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag=="
         },
         "readable-stream": {
-          "version": "2.0.6",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.0.6.tgz",
-          "integrity": "sha1-j5A0HmilPMySh4jaz80Rs265t44=",
+          "version": "2.3.7",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
+          "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
           "requires": {
             "core-util-is": "~1.0.0",
-            "inherits": "~2.0.1",
+            "inherits": "~2.0.3",
             "isarray": "~1.0.0",
-            "process-nextick-args": "~1.0.6",
-            "string_decoder": "~0.10.x",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
             "util-deprecate": "~1.0.1"
           }
+        },
+        "string_decoder": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          }
         }
       }
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@@ -3967,9 +4003,9 @@
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-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/lie/-/lie-3.1.1.tgz",
-      "integrity": "sha1-mkNrLMd0bKWd56QfpGmz77dr2H4=",
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/lie/-/lie-3.3.0.tgz",
+      "integrity": "sha512-UaiMJzeWRlEujzAuw5LokY1L5ecNQYZKfmyZ9L7wDHb/p5etKaxXhohBcrw0EYby+G/NA52vRSN4N39dxHAIwQ==",
       "requires": {
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       }
@@ -4477,8 +4513,7 @@
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       "resolved": "https://registry.npmjs.org/pako/-/pako-1.0.8.tgz",
-      "integrity": "sha512-6i0HVbUfcKaTv+EG8ZTr75az7GFXcLYk9UyLEg7Notv/Ma+z/UG3TCoz6GiNeOrn1E/e63I0X/Hpw18jHOTUnA==",
-      "dev": true
+      "integrity": "sha512-6i0HVbUfcKaTv+EG8ZTr75az7GFXcLYk9UyLEg7Notv/Ma+z/UG3TCoz6GiNeOrn1E/e63I0X/Hpw18jHOTUnA=="
     },
     "parents": {
       "version": "1.0.1",
@@ -4625,7 +4660,8 @@
     "process-nextick-args": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
-      "integrity": "sha1-FQ4gt1ZZCtP5EJPyWk8q2L/zC6M="
+      "integrity": "sha1-FQ4gt1ZZCtP5EJPyWk8q2L/zC6M=",
+      "dev": true
     },
     "ps-tree": {
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@@ -4958,8 +4994,7 @@
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       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
-      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
-      "dev": true
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
     },
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@@ -4979,8 +5014,7 @@
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       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/set-immediate-shim/-/set-immediate-shim-1.0.1.tgz",
-      "integrity": "sha1-SysbJ+uAip+NzEgaWOXlb1mfP2E=",
-      "dev": true
+      "integrity": "sha1-SysbJ+uAip+NzEgaWOXlb1mfP2E="
     },
     "set-value": {
       "version": "2.0.0",
@@ -5392,7 +5426,8 @@
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       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-      "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ="
+      "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+      "dev": true
     },
     "strip-ansi": {
       "version": "3.0.1",
diff --git a/package.json b/package.json
index be0310e..c305c71 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
   },
   "homepage": "https://github.com/env3d/env3d-js#readme",
   "dependencies": {
-    "jszip": "^3.1.5",
+    "jszip": "^3.7.0",
     "jszip-utils": "0.0.2",
     "three": "^0.91.0"
   },