diff --git a/Dockerfile b/Dockerfile
index 1b5c31e..bd828f5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.21-alpine as build
+FROM golang:1.21-alpine@sha256:f13f4337410aa46b1a20be17a990599a260fd50cd554c9fa6b7138a76879da1a as build
 COPY . /code
 WORKDIR /code
 ENV CGO_ENABLED=0
@@ -6,7 +6,7 @@ ENV GOPROXY=https://proxy.golang.org
 RUN go mod download && \
     go build -o app
 
-FROM alpine:3.18
+FROM alpine:3.18@sha256:11e21d7b981a59554b3f822c49f6e9f57b6068bb74f49c4cd5cc4c663c7e5160
 RUN apk add --no-cache tzdata ca-certificates
 COPY --from=build /code/app /app/app
 WORKDIR /app