diff --git a/Dockerfile b/Dockerfile
index 97b987a..3a5d19d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.26@sha256:595c7847cff97c9a9e76f015083c481d26078f961c9c8dca3923132f51fe12f1 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests