diff --git a/Dockerfile b/Dockerfile
index 97b987a..56fff67 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.26@sha256:3aff6657219a4d9c14e27fb1d8976c49c29fddb70ba835014f477e1c70636647 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests