diff --git a/Dockerfile b/Dockerfile
index 97b987a..35c2b09 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.25@sha256:31c1e53dfc1cc2d269deec9c83f58729fa3c53dc9a576f6426109d1e319e9e9a as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests