diff --git a/idp/static/gitbranching/learnGitBranching/yarn.lock b/idp/static/gitbranching/learnGitBranching/yarn.lock
index f005d14..c17d172 100644
--- a/idp/static/gitbranching/learnGitBranching/yarn.lock
+++ b/idp/static/gitbranching/learnGitBranching/yarn.lock
@@ -732,8 +732,8 @@ bn.js@^5.0.0, bn.js@^5.2.1:
   resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-5.2.1.tgz#0bc527a6a0d18d0aa8d5b0538ce4a77dccfa7b70"
 
 brace-expansion@^1.1.7:
-  version "1.1.11"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
+  version "1.1.21"
+  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.21.tgz#edf4fab5c64d051aea5a8def49aba1c7522279f3"
   dependencies:
     balanced-match "^1.0.0"
     concat-map "0.0.1"