diff --git a/Dockerfile b/Dockerfile
index 97ec6c9..b0ff98c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.21 AS builder
+FROM alpine:3.21.6 AS builder
 
 RUN apk add --no-cache build-base
 
@@ -6,7 +6,7 @@ WORKDIR /app
 COPY . .
 RUN gcc -o deployment deployment.c
 
-FROM alpine:3.21
+FROM alpine:3.21.6
 
 RUN addgroup -g 1000 appgroup && \
     adduser -D -u 1000 -G appgroup appuser