diff --git a/package-lock.json b/package-lock.json
index 18052cde5..d4887caf2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -506,7 +506,7 @@
         },
         "chalk": {
           "version": "1.1.3",
-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
@@ -1002,9 +1002,9 @@
       "dev": true
     },
     "commander": {
-      "version": "2.17.1",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.17.1.tgz",
-      "integrity": "sha512-wPMUt6FnH2yzG95SA6mzjQOEKUU3aLaDEmzs1ti+1E9h+CsrZghRlqEM/EJ4KscsQVG8uNN4uVreUeT8+drlgg==",
+      "version": "2.20.3",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
+      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
       "dev": true
     },
     "commondir": {
@@ -2233,7 +2233,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -2254,12 +2255,14 @@
         "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"
@@ -2274,17 +2277,20 @@
         "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",
@@ -2401,7 +2407,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -2413,6 +2420,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -2427,6 +2435,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -2434,12 +2443,14 @@
         "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"
@@ -2458,6 +2469,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -2538,7 +2550,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -2550,6 +2563,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -2635,7 +2649,8 @@
         "safe-buffer": {
           "version": "5.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -2671,6 +2686,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -2690,6 +2706,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -2733,12 +2750,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -2924,9 +2943,9 @@
       }
     },
     "he": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/he/-/he-1.1.1.tgz",
-      "integrity": "sha1-k0EP0hsAlzUVH4howvJx80J+I/0=",
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/he/-/he-1.2.0.tgz",
+      "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==",
       "dev": true
     },
     "highlight.js": {
@@ -2964,30 +2983,18 @@
       "dev": true
     },
     "html-minifier": {
-      "version": "3.5.20",
-      "resolved": "https://registry.npmjs.org/html-minifier/-/html-minifier-3.5.20.tgz",
-      "integrity": "sha512-ZmgNLaTp54+HFKkONyLFEfs5dd/ZOtlquKaTnqIWFmx3Av5zG6ZPcV2d0o9XM2fXOTxxIf6eDcwzFFotke/5zA==",
-      "dev": true,
-      "requires": {
-        "camel-case": "3.0.x",
-        "clean-css": "4.2.x",
-        "commander": "2.17.x",
-        "he": "1.1.x",
-        "param-case": "2.1.x",
-        "relateurl": "0.2.x",
-        "uglify-js": "3.4.x"
-      },
-      "dependencies": {
-        "uglify-js": {
-          "version": "3.4.9",
-          "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.4.9.tgz",
-          "integrity": "sha512-8CJsbKOtEbnJsTyv6LE6m6ZKniqMiFWmm9sRbopbkGs3gMPPfd3Fh8iIA4Ykv5MgaTbqHr4BaoGLJLZNhsrW1Q==",
-          "dev": true,
-          "requires": {
-            "commander": "~2.17.1",
-            "source-map": "~0.6.1"
-          }
-        }
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/html-minifier/-/html-minifier-4.0.0.tgz",
+      "integrity": "sha512-aoGxanpFPLg7MkIl/DDFYtb0iWz7jMFGqFhvEDZga6/4QTjneiD8I/NXL1x5aaoCp7FSIT6h/OhykDdPsbtMig==",
+      "dev": true,
+      "requires": {
+        "camel-case": "^3.0.0",
+        "clean-css": "^4.2.1",
+        "commander": "^2.19.0",
+        "he": "^1.2.0",
+        "param-case": "^2.1.1",
+        "relateurl": "^0.2.7",
+        "uglify-js": "^3.5.1"
       }
     },
     "htmlparser2": {
@@ -3006,7 +3013,7 @@
     },
     "http-errors": {
       "version": "1.6.3",
-      "resolved": "http://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
+      "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
       "integrity": "sha1-i1VoC7S+KDoLW/TqLjhYC+HZMg0=",
       "requires": {
         "depd": "~1.1.2",
@@ -3015,6 +3022,12 @@
         "statuses": ">= 1.4.0 < 2"
       }
     },
+    "http-link-header": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/http-link-header/-/http-link-header-1.0.2.tgz",
+      "integrity": "sha512-z6YOZ8ZEnejkcCWlGZzYXNa6i+ZaTfiTg3WhlV/YvnNya3W/RbX1bMVUMTuCrg/DrtTCQxaFCkXCz4FtLpcebg==",
+      "dev": true
+    },
     "https-browserify": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/https-browserify/-/https-browserify-1.0.0.tgz",
@@ -4775,17 +4788,24 @@
       }
     },
     "sapper": {
-      "version": "0.23.1",
-      "resolved": "https://registry.npmjs.org/sapper/-/sapper-0.23.1.tgz",
-      "integrity": "sha512-iKv7UcBJWzrPbnb2ccLkyhlb2aknEzXIe5do+pYVe1ZyGt0rUv80+jLEerEZthQk32JnPYu9tpMofjGFlhlD8w==",
+      "version": "0.27.11",
+      "resolved": "https://registry.npmjs.org/sapper/-/sapper-0.27.11.tgz",
+      "integrity": "sha512-5EaPZhlc8OnyN3UCI6dRSM1Gz5sxyzLZG/1z5nMvZhg9Ng+rSvEvJx/rW/tSHcnQPa8or7+YcbfvQHKS5oPHiw==",
       "dev": true,
       "requires": {
-        "html-minifier": "^3.5.16",
-        "shimport": "0.0.11",
-        "source-map-support": "^0.5.6",
-        "sourcemap-codec": "^1.4.1",
-        "string-hash": "^1.1.3",
-        "tslib": "^1.9.1"
+        "html-minifier": "^4.0.0",
+        "http-link-header": "^1.0.2",
+        "shimport": "^1.0.1",
+        "sourcemap-codec": "^1.4.6",
+        "string-hash": "^1.1.3"
+      },
+      "dependencies": {
+        "sourcemap-codec": {
+          "version": "1.4.8",
+          "resolved": "https://registry.npmjs.org/sourcemap-codec/-/sourcemap-codec-1.4.8.tgz",
+          "integrity": "sha512-9NykojV5Uih4lgo5So5dtw+f0JgJX30KCNI8gwhz2J9A15wD0Ml6tjHKwf6fTSa6fAdVBdZeNOs9eJ71qCk8vA==",
+          "dev": true
+        }
       }
     },
     "schema-utils": {
@@ -4930,9 +4950,9 @@
       }
     },
     "shimport": {
-      "version": "0.0.11",
-      "resolved": "https://registry.npmjs.org/shimport/-/shimport-0.0.11.tgz",
-      "integrity": "sha512-wRlG/wMuV/czrzJEWBUPjydU/Ve0kTrTH8wHLRjuY6S2BDB+qDDXkTY/WrNc/7t5jnd0LPVO1sRIE7Ga6uXTpw==",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/shimport/-/shimport-1.0.1.tgz",
+      "integrity": "sha512-Imf4gH+8WQmT1GvxS/x79qpmfnE6m50hyN1ucatX+7oMCgmaF8obZWCPIzSUe6+P+YmXM46lkP2pxiV2/lt9Og==",
       "dev": true
     },
     "signal-exit": {
@@ -5093,16 +5113,6 @@
         "urix": "^0.1.0"
       }
     },
-    "source-map-support": {
-      "version": "0.5.9",
-      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.9.tgz",
-      "integrity": "sha512-gR6Rw4MvUlYy83vP0vxoVNzM6t8MUXqNuRsuBmBHQDu1Fh6X015FrLdgoDKcNdkwGubozq0P4N0Q37UyFVr1EA==",
-      "dev": true,
-      "requires": {
-        "buffer-from": "^1.0.0",
-        "source-map": "^0.6.0"
-      }
-    },
     "source-map-url": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/source-map-url/-/source-map-url-0.4.0.tgz",
@@ -5540,6 +5550,12 @@
         }
       }
     },
+    "uglify-js": {
+      "version": "3.10.3",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.10.3.tgz",
+      "integrity": "sha512-Lh00i69Uf6G74mvYpHCI9KVVXLcHW/xu79YTvH7Mkc9zyKUeSPz0owW0dguj0Scavns3ZOh3wY63J0Zb97Za2g==",
+      "dev": true
+    },
     "uglifyjs-webpack-plugin": {
       "version": "1.2.7",
       "resolved": "https://registry.npmjs.org/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.7.tgz",
diff --git a/package.json b/package.json
index 19bf46305..a3fb33bde 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "glob": "^7.1.2",
     "html-entities": "^1.2.1",
     "now": "^13.0.4",
-    "sapper": "^0.23.1",
+    "sapper": "^0.27.11",
     "style-loader": "^0.22.0",
     "svelte": "^2.9.11",
     "svelte-loader": "^2.10.1",