diff --git a/package.json b/package.json
index 849ef902..d4bacef4 100644
--- a/package.json
+++ b/package.json
@@ -78,7 +78,7 @@
     "strict-uri-encode": "^2.0.0",
     "style-loader": "^0.19.0",
     "uglify-js": "^3.0.28",
-    "uglifyjs-webpack-plugin": "^1.0.1",
+    "uglifyjs-webpack-plugin": "^1.2.5",
     "universal-fetch": "^1.0.0",
     "url-loader": "^0.6.2",
     "webp-loader": "^0.2.1",
diff --git a/yarn.lock b/yarn.lock
index e61d65ce..e627901a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -41,6 +41,10 @@ ajv-keywords@^2.0.0, ajv-keywords@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/ajv-keywords/-/ajv-keywords-2.1.0.tgz#a296e17f7bfae7c1ce4f7e0de53d29cb32162df0"
 
+ajv-keywords@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/ajv-keywords/-/ajv-keywords-3.1.0.tgz#ac2b27939c543e95d2c06e7f7f5c27be4aa543be"
+
 ajv@^4.9.1:
   version "4.11.8"
   resolved "https://registry.yarnpkg.com/ajv/-/ajv-4.11.8.tgz#82ffb02b29e662ae53bdc20af15947706739c536"
@@ -57,6 +61,15 @@ ajv@^5.0.0, ajv@^5.1.0, ajv@^5.1.5, ajv@^5.2.0, ajv@^5.2.2, ajv@^5.2.3:
     fast-json-stable-stringify "^2.0.0"
     json-schema-traverse "^0.3.0"
 
+ajv@^6.1.0:
+  version "6.4.0"
+  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.4.0.tgz#d3aff78e9277549771daf0164cff48482b754fc6"
+  dependencies:
+    fast-deep-equal "^1.0.0"
+    fast-json-stable-stringify "^2.0.0"
+    json-schema-traverse "^0.3.0"
+    uri-js "^3.0.2"
+
 align-text@^0.1.1, align-text@^0.1.3:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/align-text/-/align-text-0.1.4.tgz#0cd90a561093f35d0a99256c22b7069433fad117"
@@ -1090,7 +1103,7 @@ block-stream@*:
   dependencies:
     inherits "~2.0.0"
 
-bluebird@^3.5.0, bluebird@^3.5.1:
+bluebird@^3.5.1:
   version "3.5.1"
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.1.tgz#d9551f9de98f1fcda1e683d17ee91a0602ee2eb9"
 
@@ -1284,23 +1297,23 @@ bytes@3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/bytes/-/bytes-3.0.0.tgz#d32815404d689699f85a4ea4fa8755dd13a96048"
 
-cacache@^10.0.0:
-  version "10.0.0"
-  resolved "https://registry.yarnpkg.com/cacache/-/cacache-10.0.0.tgz#3bba88bf62b0773fd9a691605f60c9d3c595e853"
+cacache@^10.0.4:
+  version "10.0.4"
+  resolved "https://registry.yarnpkg.com/cacache/-/cacache-10.0.4.tgz#6452367999eff9d4188aefd9a14e9d7c6a263460"
   dependencies:
-    bluebird "^3.5.0"
+    bluebird "^3.5.1"
     chownr "^1.0.1"
     glob "^7.1.2"
     graceful-fs "^4.1.11"
     lru-cache "^4.1.1"
-    mississippi "^1.3.0"
+    mississippi "^2.0.0"
     mkdirp "^0.5.1"
     move-concurrently "^1.0.1"
     promise-inflight "^1.0.1"
-    rimraf "^2.6.1"
-    ssri "^5.0.0"
+    rimraf "^2.6.2"
+    ssri "^5.2.4"
     unique-filename "^1.1.0"
-    y18n "^3.2.1"
+    y18n "^4.0.0"
 
 caller-path@^0.1.0:
   version "0.1.0"
@@ -1597,6 +1610,10 @@ commander@2.11.0, commander@^2.11.0, commander@~2.11.0:
   version "2.11.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.11.0.tgz#157152fd1e7a6c8d98a5b715cf376df928004563"
 
+commander@~2.13.0:
+  version "2.13.0"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.13.0.tgz#6964bca67685df7c1f1430c584f07d7597885b9c"
+
 commander@~2.8.1:
   version "2.8.1"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.8.1.tgz#06be367febfda0c330aa1e2a072d3dc9762425d4"
@@ -2339,12 +2356,18 @@ enhanced-resolve@^3.4.0:
     object-assign "^4.0.1"
     tapable "^0.2.7"
 
-errno@^0.1.3, errno@^0.1.4:
+errno@^0.1.3:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/errno/-/errno-0.1.4.tgz#b896e23a9e5e8ba33871fc996abd3635fc9a1c7d"
   dependencies:
     prr "~0.0.0"
 
+errno@~0.1.7:
+  version "0.1.7"
+  resolved "https://registry.yarnpkg.com/errno/-/errno-0.1.7.tgz#4684d71779ad39af177e3f007996f7c67c852618"
+  dependencies:
+    prr "~1.0.1"
+
 error-ex@^1.2.0:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/error-ex/-/error-ex-1.3.1.tgz#f855a86ce61adc4e8621c3cda21e7a7612c3a8dc"
@@ -4796,9 +4819,9 @@ minizlib@^1.0.3:
   dependencies:
     minipass "^2.2.1"
 
-mississippi@^1.3.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/mississippi/-/mississippi-1.3.0.tgz#d201583eb12327e3c5c1642a404a9cacf94e34f5"
+mississippi@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/mississippi/-/mississippi-2.0.0.tgz#3442a508fafc28500486feea99409676e4ee5a6f"
   dependencies:
     concat-stream "^1.5.0"
     duplexify "^3.4.2"
@@ -4806,7 +4829,7 @@ mississippi@^1.3.0:
     flush-write-stream "^1.0.0"
     from2 "^2.1.0"
     parallel-transform "^1.1.0"
-    pump "^1.0.0"
+    pump "^2.0.1"
     pumpify "^1.3.3"
     stream-each "^1.1.0"
     through2 "^2.0.0"
@@ -6049,6 +6072,10 @@ prr@~0.0.0:
   version "0.0.0"
   resolved "https://registry.yarnpkg.com/prr/-/prr-0.0.0.tgz#1a84b85908325501411853d0081ee3fa86e2926a"
 
+prr@~1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/prr/-/prr-1.0.1.tgz#d3fc114ba06995a45ec6893f484ceb1d78f5f476"
+
 ps-tree@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/ps-tree/-/ps-tree-1.1.0.tgz#b421b24140d6203f1ed3c76996b4427b08e8c014"
@@ -6076,6 +6103,13 @@ pump@^1.0.0:
     end-of-stream "^1.1.0"
     once "^1.3.1"
 
+pump@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/pump/-/pump-2.0.1.tgz#12399add6e4cf7526d973cbc8b5ce2e2908b3909"
+  dependencies:
+    end-of-stream "^1.1.0"
+    once "^1.3.1"
+
 pumpify@^1.3.3:
   version "1.3.5"
   resolved "https://registry.yarnpkg.com/pumpify/-/pumpify-1.3.5.tgz#1b671c619940abcaeac0ad0e3a3c164be760993b"
@@ -6092,6 +6126,10 @@ punycode@^1.2.4, punycode@^1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-1.4.1.tgz#c0d5a63b2718800ad8e1eb0fa5269c84dd41845e"
 
+punycode@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.0.tgz#5f863edc89b96db09074bad7947bf09056ca4e7d"
+
 pwa-srcset-loader@^1.1.2:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/pwa-srcset-loader/-/pwa-srcset-loader-1.1.3.tgz#f0e1ab85b13014657d051741794979ff815fec20"
@@ -6620,7 +6658,7 @@ right-align@^0.1.1:
   dependencies:
     align-text "^0.1.1"
 
-rimraf@2, rimraf@^2.2.6, rimraf@^2.2.8, rimraf@^2.5.1, rimraf@^2.5.4, rimraf@^2.6.1:
+rimraf@2, rimraf@^2.2.6, rimraf@^2.2.8, rimraf@^2.5.1, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2:
   version "2.6.2"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.6.2.tgz#2ed8150d24a16ea8651e6d6ef0f47c4158ce7a36"
   dependencies:
@@ -6692,6 +6730,13 @@ schema-utils@^0.3.0:
   dependencies:
     ajv "^5.0.0"
 
+schema-utils@^0.4.5:
+  version "0.4.5"
+  resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-0.4.5.tgz#21836f0608aac17b78f9e3e24daff14a5ca13a3e"
+  dependencies:
+    ajv "^6.1.0"
+    ajv-keywords "^3.1.0"
+
 scss-tokenizer@^0.2.3:
   version "0.2.3"
   resolved "https://registry.yarnpkg.com/scss-tokenizer/-/scss-tokenizer-0.2.3.tgz#8eb06db9a9723333824d3f5530641149847ce5d1"
@@ -6769,6 +6814,10 @@ send@0.16.1:
     range-parser "~1.2.0"
     statuses "~1.3.1"
 
+serialize-javascript@^1.4.0:
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/serialize-javascript/-/serialize-javascript-1.5.0.tgz#1aa336162c88a890ddad5384baebc93a655161fe"
+
 serve-favicon@^2.4.3:
   version "2.4.5"
   resolved "https://registry.yarnpkg.com/serve-favicon/-/serve-favicon-2.4.5.tgz#49d9a46863153a9240691c893d2b0e7d85d6d436"
@@ -7033,11 +7082,11 @@ sshpk@^1.7.0:
     jsbn "~0.1.0"
     tweetnacl "~0.14.0"
 
-ssri@^5.0.0:
-  version "5.0.0"
-  resolved "https://registry.yarnpkg.com/ssri/-/ssri-5.0.0.tgz#13c19390b606c821f2a10d02b351c1729b94d8cf"
+ssri@^5.2.4:
+  version "5.3.0"
+  resolved "https://registry.yarnpkg.com/ssri/-/ssri-5.3.0.tgz#ba3872c9c6d33a0704a7d71ff045e5ec48999d06"
   dependencies:
-    safe-buffer "^5.1.0"
+    safe-buffer "^5.1.1"
 
 stackframe@^0.3.1:
   version "0.3.1"
@@ -7499,11 +7548,11 @@ ua-parser-js@^0.7.9:
   version "0.7.17"
   resolved "https://registry.yarnpkg.com/ua-parser-js/-/ua-parser-js-0.7.17.tgz#e9ec5f9498b9ec910e7ae3ac626a805c4d09ecac"
 
-uglify-es@^3.1.3:
-  version "3.1.5"
-  resolved "https://registry.yarnpkg.com/uglify-es/-/uglify-es-3.1.5.tgz#63bae0fd4f9feeda417fee7c0ff685a673819683"
+uglify-es@^3.3.4:
+  version "3.3.9"
+  resolved "https://registry.yarnpkg.com/uglify-es/-/uglify-es-3.3.9.tgz#0c1c4f0700bed8dbc124cdb304d2592ca203e677"
   dependencies:
-    commander "~2.11.0"
+    commander "~2.13.0"
     source-map "~0.6.1"
 
 uglify-js@^2.8.29:
@@ -7534,17 +7583,18 @@ uglifyjs-webpack-plugin@^0.4.6:
     uglify-js "^2.8.29"
     webpack-sources "^1.0.1"
 
-uglifyjs-webpack-plugin@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.0.1.tgz#d324da7144d321202df0968c09f6f8e057d5cdc2"
+uglifyjs-webpack-plugin@^1.2.5:
+  version "1.2.5"
+  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.5.tgz#2ef8387c8f1a903ec5e44fa36f9f3cbdcea67641"
   dependencies:
-    cacache "^10.0.0"
+    cacache "^10.0.4"
     find-cache-dir "^1.0.0"
-    schema-utils "^0.3.0"
-    source-map "^0.5.6"
-    uglify-es "^3.1.3"
-    webpack-sources "^1.0.1"
-    worker-farm "^1.4.1"
+    schema-utils "^0.4.5"
+    serialize-javascript "^1.4.0"
+    source-map "^0.6.1"
+    uglify-es "^3.3.4"
+    webpack-sources "^1.1.0"
+    worker-farm "^1.5.2"
 
 uid-number@^0.0.6:
   version "0.0.6"
@@ -7630,6 +7680,12 @@ update-notifier@^2.2.0:
     semver-diff "^2.0.0"
     xdg-basedir "^3.0.0"
 
+uri-js@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/uri-js/-/uri-js-3.0.2.tgz#f90b858507f81dea4dcfbb3c4c3dbfa2b557faaa"
+  dependencies:
+    punycode "^2.1.0"
+
 url-loader@^0.6.2:
   version "0.6.2"
   resolved "https://registry.yarnpkg.com/url-loader/-/url-loader-0.6.2.tgz#a007a7109620e9d988d14bce677a1decb9a993f7"
@@ -7893,6 +7949,13 @@ webpack-sources@^1.0.1:
     source-list-map "^2.0.0"
     source-map "~0.5.3"
 
+webpack-sources@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-1.1.0.tgz#a101ebae59d6507354d71d8013950a3a8b7a5a54"
+  dependencies:
+    source-list-map "^2.0.0"
+    source-map "~0.6.1"
+
 webpack@^3.5.6:
   version "3.8.1"
   resolved "https://registry.yarnpkg.com/webpack/-/webpack-3.8.1.tgz#b16968a81100abe61608b0153c9159ef8bb2bd83"
@@ -7981,12 +8044,11 @@ workbox-sw@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/workbox-sw/-/workbox-sw-2.1.0.tgz#605f50ce6ac5857114484b824b24d4454d351895"
 
-worker-farm@^1.4.1:
-  version "1.5.0"
-  resolved "https://registry.yarnpkg.com/worker-farm/-/worker-farm-1.5.0.tgz#adfdf0cd40581465ed0a1f648f9735722afd5c8d"
+worker-farm@^1.5.2:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/worker-farm/-/worker-farm-1.6.0.tgz#aecc405976fab5a95526180846f0dba288f3a4a0"
   dependencies:
-    errno "^0.1.4"
-    xtend "^4.0.1"
+    errno "~0.1.7"
 
 wrap-ansi@^2.0.0:
   version "2.1.0"
@@ -8023,7 +8085,7 @@ xdg-basedir@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-3.0.0.tgz#496b2cc109eca8dbacfe2dc72b603c17c5870ad4"
 
-"xtend@>=4.0.0 <4.1.0-0", xtend@^4.0.0, xtend@^4.0.1, xtend@~4.0.0, xtend@~4.0.1:
+"xtend@>=4.0.0 <4.1.0-0", xtend@^4.0.0, xtend@~4.0.0, xtend@~4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
 
@@ -8031,6 +8093,10 @@ y18n@^3.2.1:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/y18n/-/y18n-3.2.1.tgz#6d15fba884c08679c0d77e88e7759e811e07fa41"
 
+y18n@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.0.tgz#95ef94f85ecc81d007c264e190a120f0a3c8566b"
+
 yallist@^2.1.2:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"