diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index edacfd6..42fb77c 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -3,13 +3,13 @@
 {
 	"name": "Go",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/devcontainers/go:1-1.21-bullseye",
+	"image": "mcr.microsoft.com/devcontainers/go:1-1.21-bullseye@sha256:0ea3913135923a684b37f9e75a1e9adbb14551199244656b77f516c4c0c6d5bc",
 	"containerEnv": {
 		"SHELL": "/bin/zsh"
 	},
 	"features": {
-		"ghcr.io/devcontainers/features/docker-in-docker:2": {},
-		"ghcr.io/rocker-org/devcontainer-features/apt-packages:1": {
+		"ghcr.io/devcontainers/features/docker-in-docker:2@sha256:503f23cd692325b3cbb8c20a0ecfabb3444b0c786b363e0c82572bd7d71dc099": {},
+		"ghcr.io/rocker-org/devcontainer-features/apt-packages:1@sha256:87a4d7750a596a5db034ba8508782f31aebdc2ffe955c66aaecb33d9de2ecdae": {
 			"packages": "telnet"
 		}
 	},
diff --git a/Dockerfile b/Dockerfile
index eb0254c..2b87c2a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.6 as alpine
+FROM alpine:3.19@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b as alpine
 
 RUN apk add -U --no-cache ca-certificates
 
diff --git a/Dockerfile.build b/Dockerfile.build
index 394c24a..40aa5a9 100644
--- a/Dockerfile.build
+++ b/Dockerfile.build
@@ -1,4 +1,4 @@
-FROM golang:1.21.5-alpine as build
+FROM golang:1.22.2-alpine@sha256:cdc86d9f363e8786845bea2040312b4efa321b828acdeb26f393faa864d887b0 as build
 
 WORKDIR /app