diff --git a/Dockerfile b/Dockerfile
index 97b987a2..d88b643b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.25@sha256:e68f6a00e88586577fafa4d9cefad1349c2be70d21244321321c407474ff9bf2 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests