diff --git a/.gitmodules b/.gitmodules
index e0b2b5e4..45ff1fc0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,3 +16,6 @@
 [submodule "apps/readest-app/.claude/skills/gstack"]
 	path = apps/readest-app/.claude/skills/gstack
 	url = https://github.com/garrytan/gstack.git
+[submodule "packages/qcms"]
+	path = packages/qcms
+	url = https://github.com/mozilla/pdf.js.qcms.git
diff --git a/apps/readest-app/next.config.mjs b/apps/readest-app/next.config.mjs
index 079d06b6..89f7b877 100644
--- a/apps/readest-app/next.config.mjs
+++ b/apps/readest-app/next.config.mjs
@@ -38,6 +38,7 @@ const nextConfig = {
   turbopack: {
     resolveAlias: {
       nunjucks: 'nunjucks/browser/nunjucks.js',
+      ...(appPlatform !== 'web' ? { '@tursodatabase/database-wasm': './src/utils/stub.ts' } : {}),
     },
   },
   transpilePackages: [
diff --git a/apps/readest-app/src/utils/stub.ts b/apps/readest-app/src/utils/stub.ts
new file mode 100644
index 00000000..194cc4a2
--- /dev/null
+++ b/apps/readest-app/src/utils/stub.ts
@@ -0,0 +1,2 @@
+// Empty module stub for excluding optional dependencies
+export {};
diff --git a/packages/qcms b/packages/qcms
new file mode 160000
index 00000000..fc23a407
--- /dev/null
+++ b/packages/qcms
@@ -0,0 +1 @@
+Subproject commit fc23a407f1ed9ccfea15875d27e0936dcc798a1f
diff --git a/packages/simplecc-wasm b/packages/simplecc-wasm
index 3e468932..5e5b56f5 160000
--- a/packages/simplecc-wasm
+++ b/packages/simplecc-wasm
@@ -1 +1 @@
-Subproject commit 3e4689325f769da999a407b07bc705b1f91c5622
+Subproject commit 5e5b56f5b82394e7df07f9171ac70f4578b24a32