diff --git a/yarn.lock b/yarn.lock
index 84f3e40..ff0ce9f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -856,9 +856,9 @@ acorn-dynamic-import@^3.0.0:
     acorn "^5.0.0"
 
 acorn@^5.0.0, acorn@^5.6.2:
-  version "5.7.3"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
-  integrity sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
+  integrity sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==
 
 ajv-keywords@^3.1.0:
   version "3.2.0"
@@ -2863,7 +2863,7 @@ p-finally@^1.0.0:
 
 p-is-promise@^1.1.0:
   version "1.1.0"
-  resolved "http://registry.npmjs.org/p-is-promise/-/p-is-promise-1.1.0.tgz#9c9456989e9f6588017b0434d56097675c3da05e"
+  resolved "https://registry.npmjs.org/p-is-promise/-/p-is-promise-1.1.0.tgz#9c9456989e9f6588017b0434d56097675c3da05e"
 
 p-limit@^1.1.0:
   version "1.3.0"
@@ -3144,7 +3144,7 @@ rc@^1.2.7:
 
 "readable-stream@1 || 2", readable-stream@^2.0.0, readable-stream@^2.0.4, readable-stream@^2.1.5, readable-stream@^2.2.2:
   version "2.3.6"
-  resolved "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
+  resolved "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
   dependencies:
     core-util-is "~1.0.0"
     inherits "~2.0.3"