diff --git a/yarn.lock b/yarn.lock
index 12311ef..9f72d63 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1796,9 +1796,9 @@ acorn-walk@^6.0.1:
   integrity sha512-OtUw6JUTgxA2QoqqmrmQ7F2NYqiBPi/L2jqHyFtllhOUvXYQXf0Z1CYUinIfyT4bTCGmrA7gX9FvHA81uzCoVw==
 
 acorn@^5.5.3:
-  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==
 
 acorn@^6.0.1, acorn@^6.0.4, acorn@^6.0.5, acorn@^6.0.7:
   version "6.1.1"
@@ -9440,7 +9440,7 @@ sisteransi@^1.0.0:
   resolved "https://registry.yarnpkg.com/sisteransi/-/sisteransi-1.0.0.tgz#77d9622ff909080f1c19e5f4a1df0c1b0a27b88c"
   integrity sha512-N+z4pHB4AmUv0SjveWRd6q1Nj5w62m5jodv+GD8lvmbY/83T/rpbJGZOnK5T149OldDj4Db07BSv9xY4K6NTPQ==
 
-sitemap@^4.1.1:
+sitemap@4.1.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/sitemap/-/sitemap-4.1.1.tgz#c9b459c7d797e629c61f56b86586d4f67dbf250b"
   integrity sha512-+8yd66IxyIFEMFkFpVoPuoPwBvdiL7Ap/HS5YD7igqO4phkyTPFIprCAE9NMHehAY5ZGN3MkAze4lDrOAX3sVQ==