diff --git a/Dockerfile.full b/Dockerfile.full
index 12db34fc..23bdbff6 100644
--- a/Dockerfile.full
+++ b/Dockerfile.full
@@ -4,7 +4,7 @@ FROM node:23-alpine AS ui-builder
 WORKDIR /app/ui
 
 # Install pnpm
-RUN corepack enable pnpm && corepack prepare pnpm@latest --activate
+RUN corepack enable pnpm && corepack prepare pnpm@10.15.0 --activate
 
 # Copy UI source
 COPY ui/package.json ui/pnpm-lock.yaml* ./
diff --git a/ui/package.json b/ui/package.json
index 839abd5a..e7b03be2 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -1,5 +1,6 @@
 {
   "name": "routstr-service",
+  "packageManager": "pnpm@10.15.0",
   "version": "0.1.0",
   "private": true,
   "scripts": {