diff --git a/Dockerfile b/Dockerfile
index fbc40d0..d587a67 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,6 +9,9 @@ FROM node:20-alpine AS builder
 WORKDIR /app
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
+# NEXT_PUBLIC_* vars are inlined at build time
+ARG NEXT_PUBLIC_TURNSTILE_SITE_KEY
+ENV NEXT_PUBLIC_TURNSTILE_SITE_KEY=$NEXT_PUBLIC_TURNSTILE_SITE_KEY
 # Generate Prisma client before build
 RUN npx prisma generate
 RUN npm run build