diff --git a/Dockerfile b/Dockerfile
index 3d13fb1..5072459 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -141,7 +141,11 @@ WORKDIR /build
 # Cache the pnpm workspace node_modules by copying only package manifests first.
 # Copying all 4 libs' manifests + the workspace root lets pnpm install everything
 # in one shot; this layer is reused as long as the manifests don't change.
+# `pnpm-workspace.yaml` declares a patched dep (@tiptap/markdown) pointing at
+# `patches/@tiptap__markdown@3.27.3.patch`, so the patches/ tree must be present
+# before `pnpm install --frozen-lockfile` or it fails with ENOENT on the patch.
 COPY libs/package.json libs/pnpm-workspace.yaml libs/pnpm-lock.yaml libs/
+COPY libs/patches/                         libs/patches/
 COPY libs/tiptap-editor/package.json      libs/tiptap-editor/
 COPY libs/codemirror-editor/package.json  libs/codemirror-editor/
 COPY libs/lightbox/package.json           libs/lightbox/