diff --git a/lib/config/presets/internal/monorepo.ts b/lib/config/presets/internal/monorepo.ts
index 12508c7fdf2b89ccf194bb37ef4b2bc79a98b969..d9a99df25acdee33f791e15e4652b041c3d80454 100644
--- a/lib/config/presets/internal/monorepo.ts
+++ b/lib/config/presets/internal/monorepo.ts
@@ -46,6 +46,7 @@ const repoGroups = {
   'System.IO.Abstractions':
     'https://github.com/System-IO-Abstractions/System.IO.Abstractions/',
   'telus-tds': 'https://github.com/telusdigital/tds',
+  'theme-ui': 'https://github.com/system-ui/theme-ui',
   'typescript-eslint': 'https://github.com/typescript-eslint/typescript-eslint',
   'typography-js': 'https://github.com/KyleAMathews/typography.js',
   'vue-cli': 'https://github.com/vuejs/vue-cli',