diff --git a/.changeset/eleven-forks-remember.md b/.changeset/eleven-forks-remember.md
new file mode 100644
index 000000000..c71e0df9b
--- /dev/null
+++ b/.changeset/eleven-forks-remember.md
@@ -0,0 +1,5 @@
+---
+'@primer/primitives': patch
+---
+
+Simplify contrast checker script and bugfix for bgColor.upsell.muted in dark high contrast mode