diff --git a/Dockerfile b/Dockerfile
index 97b987a..0638cbf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.26@sha256:26326682769ca980f8f1d3b1f52be2dd1c1d25270e3de3fe0c97d6bb65df3556 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests