diff --git a/Dockerfile b/Dockerfile
index 348621f..8ad1d93 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM node:22.13-alpine AS builder
 
-# Enable corepack and install pnpm
-RUN corepack enable && corepack prepare pnpm@10.18.3 --activate
+# Install a pinned pnpm version without relying on Corepack's signature cache.
+RUN npm install -g pnpm@10.18.3
 
 # Disable interactive prompts
 ENV CI=true
@@ -22,7 +22,7 @@ RUN pnpm build
 
 FROM node:22.13-alpine AS runner
 
-RUN corepack enable && corepack prepare pnpm@10.18.3 --activate
+RUN npm install -g pnpm@10.18.3
 
 WORKDIR /app
 COPY --from=builder /app ./