diff --git a/Dockerfile b/Dockerfile
index 97b987a..15464b5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.25@sha256:0ece421d4bb2525b7c0b4cad5791d52be38edf4807582407525ca353a429eccc as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests