diff --git a/Dockerfile b/Dockerfile
index 5e6a7b4..4679adb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ FROM golang:alpine AS builder
 
 WORKDIR /app
 
-COPY go.mod ./
+COPY go.mod go.sum ./
 COPY *.go ./
 
 RUN go build -o server .