diff --git a/deploy/Dockerfile b/deploy/Dockerfile
index 0291e47..939eb9d 100644
--- a/deploy/Dockerfile
+++ b/deploy/Dockerfile
@@ -1,6 +1,8 @@
 FROM golang:1.25-alpine AS backend-build
 WORKDIR /src
 COPY go.mod ./
+COPY go.sum ./
+RUN go mod download
 COPY cmd ./cmd
 COPY internal ./internal
 RUN go build -o /out/temporserv ./cmd/server