diff --git a/.prettierignore b/.prettierignore
index a1f8ce0..3c03972 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,5 +1,8 @@
 dist/
 node_modules/
+# pnpm's content-addressable store lands inside the workspace on CI runners
+# (no persistent global store) — a package-manager artifact, never formatted.
+.pnpm-store/
 pnpm-lock.yaml
 apps/api/src/db/migrations/
 *.html