diff --git a/Dockerfile b/Dockerfile
index 97b987a..d0f1470 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.26@sha256:ec4debba7b371fb2eaa6169a72fc61ad93b9be6a9ae9da2a010cb81a760d36e7 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests