diff --git a/Dockerfile b/Dockerfile
index 97b987a..dcc779d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.26@sha256:2d6c80227255c3112a4d08e67ba98e58efd3846daf15d9d7d4c389565d881b1a as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests