diff --git a/yarn.lock b/yarn.lock
index 263c253..51d3e46 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -21,8 +21,8 @@ acorn-jsx@^5.0.0:
   resolved "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz#32a064fd925429216a09b141102bfdd185fae40e"
 
 acorn@^6.0.7:
-  version "6.1.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.1.1.tgz#7d25ae05bb8ad1f9b699108e1094ecd7884adc1f"
+  version "6.4.1"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.4.1.tgz#531e58ba3f51b9dacb9a6646ca4debf5b14ca474"
 
 ajv@^6.9.1:
   version "6.10.0"
@@ -525,7 +525,7 @@ is-arrayish@^0.2.1:
 
 is-builtin-module@^1.0.0:
   version "1.0.0"
-  resolved "http://registry.npmjs.org/is-builtin-module/-/is-builtin-module-1.0.0.tgz#540572d34f7ac3119f8f76c30cbc1b1e037affbe"
+  resolved "https://registry.npmjs.org/is-builtin-module/-/is-builtin-module-1.0.0.tgz#540572d34f7ac3119f8f76c30cbc1b1e037affbe"
   dependencies:
     builtin-modules "^1.0.0"
 
@@ -593,7 +593,7 @@ levn@^0.3.0, levn@~0.3.0:
 
 load-json-file@^2.0.0:
   version "2.0.0"
-  resolved "http://registry.npmjs.org/load-json-file/-/load-json-file-2.0.0.tgz#7947e42149af80d696cbf797bcaabcfe1fe29ca8"
+  resolved "https://registry.npmjs.org/load-json-file/-/load-json-file-2.0.0.tgz#7947e42149af80d696cbf797bcaabcfe1fe29ca8"
   dependencies:
     graceful-fs "^4.1.2"
     parse-json "^2.2.0"
@@ -711,7 +711,7 @@ optionator@^0.8.2:
 
 os-tmpdir@~1.0.2:
   version "1.0.2"
-  resolved "http://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
+  resolved "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
 
 p-limit@^1.1.0:
   version "1.3.0"