diff --git a/Dockerfile b/Dockerfile
index 97b987a2..1a4b729e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.25@sha256:36b4f45d2874905b9e8573b783292629bcb346d0a70d8d7150b6df545234818f as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests