diff --git a/docker/Dockerfile b/docker/Dockerfile
index e90c28c..11dfcd7 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -9,12 +9,14 @@ COPY frontend/ ./
 RUN npm run build
 
 FROM node:22-slim AS backend
-# python3/make/g++ behövs om better-sqlite3 saknar prebuilt för plattformen
+# python3/make/g++ för att kompilera better-sqlite3 från källkod —
+# prebuilt-binären kräver glibc 2.38 men bookworm har 2.36 (lastar annars
+# inte i runtime: "GLIBC_2.38 not found")
 RUN apt-get update && apt-get install -y --no-install-recommends python3 make g++ \
   && rm -rf /var/lib/apt/lists/*
 WORKDIR /app
 COPY backend/package.json backend/package-lock.json ./
-RUN npm ci --omit=dev --no-audit --no-fund
+RUN npm_config_build_from_source=true npm ci --omit=dev --no-audit --no-fund
 COPY backend/src ./src
 
 FROM node:22-slim