diff --git a/Dockerfile b/Dockerfile
index 97b987a..ba2d5dc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.26@sha256:87a41d2539e5671777734e91f467499ed5eafb1fb1f77221dff2744db7a51775 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests