diff --git a/backend/Dockerfile b/backend/Dockerfile
index 05fd73081..e6df205c2 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.24-alpine AS builder
+FROM golang:1.24-alpine@sha256:fc2cff6625f3c1c92e6c85938ac5bd09034ad0d4bc2dfb08278020b68540dbb5 AS builder
 
 # Add security updates and build tools
 RUN apk --no-cache add git ca-certificates tzdata