diff --git a/Dockerfile b/Dockerfile
index 97b987a..2bc3b70 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.25@sha256:d2e5acc5c29cc331ad5e4f59b09dee0f7d47043b072de0799be63e5c49f95feb as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests