diff --git a/Dockerfile b/Dockerfile
index 97b987a..b1eec7a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.25@sha256:ce63a16e0f7063787ebb4eb28e72d477b00b4726f79874b3205a965ffd797ab2 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests