diff --git a/Dockerfile b/Dockerfile
index 75457c8..12a0c31 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Build the manager binary
-FROM golang:1.26-alpine AS builder
+FROM golang:1.26-alpine@sha256:f1ddd9fe14fffc091dd98cb4bfa999f32c5fc77d2f2305ea9f0e2595c5437c14 AS builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests