diff --git a/Dockerfile b/Dockerfile
index 39b5ed4..54721e5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM golang:1.23.3
 WORKDIR /app
-COPY go.mod ./
+COPY go.mod go.sum ./
 RUN go mod download
 COPY *.go ./
 RUN CGO_ENABLED=0 GOOS=linux go build -o /go-ddns