diff --git a/yarn.lock b/yarn.lock
index 0d06d66..e4aba2b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2218,9 +2218,9 @@ ignore@^5.2.0:
   integrity sha512-CmxgYGiEPCLhfLnpPp1MoRmifwEIOgjcHXxOBjv7mY96c+eWScsOP9c112ZyLdWHi0FxHjI+4uVhKYp/gcdRmQ==
 
 immutable@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.npmjs.org/immutable/-/immutable-4.0.0.tgz"
-  integrity sha512-zIE9hX70qew5qTUjSS7wi1iwj/l7+m54KWU247nhM3v806UdGj1yDndXj+IOYxxtW9zyLI+xqFNZjTuDaLUqFw==
+  version "4.3.8"
+  resolved "https://registry.yarnpkg.com/immutable/-/immutable-4.3.8.tgz#02d183c7727fb2bb1d5d0380da0d779dce9296a7"
+  integrity sha512-d/Ld9aLbKpNwyl0KiM2CT1WYvkitQ1TSvmRtkcV8FKStiDoA7Slzgjmb/1G2yhKM1p0XeNOieaTbFZmU1d3Xuw==
 
 import-local@^3.0.2:
   version "3.1.0"
@@ -3219,11 +3219,6 @@ source-map@^0.6.0, source-map@^0.6.1:
   resolved "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz"
   integrity sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==
 
-source-map@~0.7.2:
-  version "0.7.3"
-  resolved "https://registry.npmjs.org/source-map/-/source-map-0.7.3.tgz"
-  integrity sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ==
-
 sprintf-js@~1.0.2:
   version "1.0.3"
   resolved "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz"