Forwarded: https://gitlab.com/gitlab-org/gitlab/-/issues/354323

--- a/Gemfile
+++ b/Gemfile
@@ -32,6 +32,9 @@
 # Supported DBs
 gem 'pg', '~> 1.4', '>= 1.4.6'
 
+# Background migrations/fix vulnerabilities
+gem 'parser', '~> 3.0'
+
 gem 'rugged', '~> 1.5'
 gem 'grape-path-helpers', '~> 1.7', '>= 1.7.1'