diff --git a/Dockerfile b/Dockerfile
index eb0254c..06b7840 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.6 as alpine
+FROM alpine:3.15@sha256:19b4bcc4f60e99dd5ebdca0cbce22c503bbcff197549d7e19dab4f22254dc864 as alpine
 
 RUN apk add -U --no-cache ca-certificates
 
diff --git a/Dockerfile.build b/Dockerfile.build
index 394c24a..e055570 100644
--- a/Dockerfile.build
+++ b/Dockerfile.build
@@ -1,4 +1,4 @@
-FROM golang:1.21.5-alpine as build
+FROM golang:1.21.6-alpine@sha256:cc2ee3cb7fd77ed7adb3aba2dc8471c01a6d65fdae60af1ce5186daf37eccd08 as build
 
 WORKDIR /app