diff --git a/Dockerfile b/Dockerfile
index 97b987a..2ae08dc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.26@sha256:c83e68f3ebb6943a2904fa66348867d108119890a2c6a2e6f07b38d0eb6c25c5 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests