diff --git a/Dockerfile b/Dockerfile
index 97b987a..4f4682f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.26@sha256:792443b89f65105abba56b9bd5e97f680a80074ac62fc844a584212f8c8102c3 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests