diff --git a/yarn.lock b/yarn.lock
index fc88ec8..cd279b8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4,7 +4,7 @@
 
 "@types/node@9.4.6":
   version "9.4.6"
-  resolved "http://registry.npmjs.org/@types/node/-/node-9.4.6.tgz#d8176d864ee48753d053783e4e463aec86b8d82e"
+  resolved "https://registry.npmjs.org/@types/node/-/node-9.4.6.tgz#d8176d864ee48753d053783e4e463aec86b8d82e"
 
 ajv@^5.5.1:
   version "5.5.2"
@@ -303,8 +303,8 @@ lodash.once@^4.0.0:
   resolved "https://registry.yarnpkg.com/lodash.once/-/lodash.once-4.1.1.tgz#0dd3971213c7c56df880977d504c88fb471a97ac"
 
 lodash@^4.17.4:
-  version "4.17.11"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.11.tgz#b39ea6229ef607ecd89e2c8df12536891cac9b8d"
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
 
 make-error@^1.1.1:
   version "1.3.5"
@@ -318,15 +318,15 @@ minimatch@^3.0.4:
 
 minimist@0.0.8:
   version "0.0.8"
-  resolved "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
+  resolved "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
 
 minimist@^1.2.0:
   version "1.2.0"
-  resolved "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
+  resolved "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
 
 mkdirp@^0.5.1:
   version "0.5.1"
-  resolved "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
+  resolved "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   dependencies:
     minimist "0.0.8"
 
@@ -336,7 +336,7 @@ ms@^2.1.1:
 
 node-fetch@2.1.2:
   version "2.1.2"
-  resolved "http://registry.npmjs.org/node-fetch/-/node-fetch-2.1.2.tgz#ab884e8e7e57e38a944753cec706f788d1768bb5"
+  resolved "https://registry.npmjs.org/node-fetch/-/node-fetch-2.1.2.tgz#ab884e8e7e57e38a944753cec706f788d1768bb5"
 
 node-fetch@^1.0.1:
   version "1.7.3"
@@ -401,7 +401,7 @@ ts-node@5.0.0:
 
 typescript@2.7.2:
   version "2.7.2"
-  resolved "http://registry.npmjs.org/typescript/-/typescript-2.7.2.tgz#2d615a1ef4aee4f574425cdff7026edf81919836"
+  resolved "https://registry.npmjs.org/typescript/-/typescript-2.7.2.tgz#2d615a1ef4aee4f574425cdff7026edf81919836"
 
 universalify@^0.1.0:
   version "0.1.2"
@@ -409,7 +409,7 @@ universalify@^0.1.0:
 
 whatwg-fetch@2.0.4:
   version "2.0.4"
-  resolved "http://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz#dde6a5df315f9d39991aa17621853d720b85566f"
+  resolved "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz#dde6a5df315f9d39991aa17621853d720b85566f"
 
 whatwg-fetch@>=0.10.0:
   version "3.0.0"